{
  "response": {
    "Key": "DEN-STL",
    "orig": {
      "code": "DEN",
      "type": "airport",
      "city": "Denver",
      "fullCity": "Denver, Colorado",
      "airport": "Denver Intl Airport"
    },
    "dest": {
      "code": "STL",
      "type": "airport",
      "city": "St. Louis",
      "fullCity": "St. Louis, Missouri",
      "airport": "Lambert Intl Airport"
    },
    "faq": {
      "q0": {
        "question": "What is the typical flight duration from Denver to St. Louis?",
        "answer": "The flight from Denver to St. Louis is about 770 miles and typically takes 2 hours and 5 minutes nonstop. The return leg is longer at 2 hours and 20 minutes due to prevailing headwinds.",
        "methodology": "Flight times and distances come from our flight-schedule database, which combines published airline timetables, U.S. government schedule data from the Bureau of Transportation Statistics (BTS), and observed flight operations from the EUROCONTROL/OpenSky Open Performance Data Initiative (OPDI). The typical flight time is the median scheduled block time across all carriers on the route, computed the same way in both directions so the difference reflects prevailing winds rather than any change in method. Distance is the great-circle distance between the two airports, so the actual flown track is typically 2-5% longer.",
        "toolsUsed": [
          "flight_schedule"
        ]
      },
      "q1": {
        "question": "Are there any direct flights from Denver to St. Louis?",
        "answer": "Yes, Southwest, United, and Frontier all fly nonstop from Denver to St. Louis. Southwest runs up to 185 weekly flights, United operates about 40 weekly with daily service (including one evening flight by SkyWest as United Express), and Frontier flies six times a week on Mondays, Wednesdays, Fridays, and Saturdays. Frontier is typically the cheapest, with median fares around $67, while Southwest and United average about $157 and $188–$222 respectively.",
        "methodology": "Airlines and weekly frequencies are compiled from our flight-schedule database, which combines published airline timetables, U.S. government schedule data from the Bureau of Transportation Statistics (BTS), and observed flight operations from the EUROCONTROL/OpenSky Open Performance Data Initiative (OPDI). We count each operating carrier's scheduled weekly departures and the days it flies; where there is no nonstop service, connecting carriers are identified by linking scheduled nonstop segments through common hub airports. Where a median fare is shown for a carrier, it reflects the real fares Priceline users found on this route in the last 72 hours. Carrier service, flight times and distances for this route come from our flight-schedule database, which draws on published airline timetables, U.S. government schedule data, and observed operations from the EUROCONTROL/OpenSky Open Performance Data Initiative (OPDI). We report the days of the week and the departure times each carrier operates. The typical flight time is the median scheduled block time, given both per carrier and across all carriers on the route; where a schedule does not publish an elapsed time, it is derived from the scheduled departure and arrival times converted to UTC. Outbound and return times are computed by the same method, so the difference between them is directly comparable and reflects prevailing winds rather than any change in derivation. Distance is the great-circle distance between the two specific airports named, so an actual flown track is typically 2-5% longer. Where shown, on-time departure and arrival rates and cancellation rates come from the U.S. Bureau of Transportation Statistics (BTS) Airline On-Time Performance dataset, which covers U.S. domestic routes only; where a typical fare is shown, it comes from the U.S. DOT Airline Origin and Destination Survey (DB1B), a quarterly 10% sample of tickets sold.",
        "toolsUsed": [
          "route_airlines",
          "flight_schedule"
        ]
      },
      "q3": {
        "question": "What are the ground transportation options in St. Louis?",
        "answer": "Getting from St. Louis Lambert International Airport to the city center is straightforward, with the MetroLink light rail offering direct, economical service to downtown and other key destinations. Taxis, ride-share services, and rental cars are also available at the airport, providing flexible options for travelers. The MetroLink is the most-used and fastest ground transportation option for reaching downtown St. Louis, as it avoids road traffic entirely. Car rentals are convenient for those planning to explore beyond the city center, with several agencies located at the airport. Overall, the combination of MetroLink and road-based options gives travelers a solid range of choices.",
        "toolsUsed": [
          "article_lookup"
        ],
        "references": [
          {
            "url": "https://en.wikipedia.org/wiki/St._Louis_Lambert_International_Airport",
            "title": "St. Louis Lambert International Airport",
            "favicon": "https://en.wikipedia.org/static/apple-touch/wikipedia.png",
            "time_published": "2026-09-06T13:20:24Z"
          },
          {
            "url": "https://airport.guide/kstl/parking",
            "title": "St Louis Airport (STL) Parking Rates and Map",
            "favicon": "https://airport.guide/apple-touch-icon.png"
          },
          {
            "url": "https://www.airport.guide/kstl",
            "title": "St Louis Airport (STL) | Terminal maps | Airport guide",
            "favicon": "https://www.airport.guide/apple-touch-icon.png"
          }
        ]
      },
      "q4": {
        "question": "When is the cheapest time to fly from Denver to St. Louis?",
        "answer": "Average fares from Denver to St. Louis bottom out around $209 in late October, making that the cheapest stretch to fly. Overall, the cheapest months are September (averaging $213), January ($216), and October ($217), while the most expensive period is late June at an average of $281. June, July, and May are the priciest months overall.",
        "methodology": "Seasonal fares come from Priceline's own air booking-summary archive, analysed in-house and refreshed monthly. For each day of the year we take a representative round-trip fare, a blend of the 25th-percentile and average ticket price over the route's bookings, and smooth the series into a seasonal curve; the half-month low and high and the monthly figures quoted here are averages of that curve. Thin and international routes borrow their seasonal shape from the nearest busy routes, with the price level anchored to the route's own bookings.",
        "toolsUsed": [
          "seasonal_prices"
        ]
      },
      "q5": {
        "question": "How far in advance should I book tickets from Denver to St. Louis?",
        "answer": "For Denver to St. Louis, the best time to book is roughly 4–6 weeks ahead of departure, when fares average about $158. Booking around 30 days out can save a few dollars more, but waiting until the last week or booking more than five months early pushes prices up sharply. Holiday and peak summer periods typically require booking further out—often 8–12 weeks ahead—to catch the lowest fares before demand drives them higher.",
        "methodology": "Booking-window guidance comes from the same monthly in-house analysis of Priceline's own air booking-summary archive. We aggregate the route's bookings by how many days before departure they were made, from about 180 days out to the day of travel, smooth the curve, and highlight the stretch of lead times with the lowest average fare. Thin and international routes borrow the curve shape from the nearest busy routes, anchored to the route's own price level. It reflects current fares and is refreshed monthly.",
        "toolsUsed": [
          "booking_timing"
        ]
      },
      "q6": {
        "question": "Are overnight (red‑eye) flights available from Denver to St. Louis?",
        "answer": "Yes, overnight red-eye flights are available nonstop from Denver to St. Louis on Southwest, with seven weekly departures on Monday, Thursday, Friday, and Sunday. The typical departure window runs from about 9:10 PM to 10:10 PM, and since this is a short hop, these flights land the same night — not the next morning.",
        "methodology": "Red-eye flights are identified from scheduled local departure and arrival times in our flight-schedule database — built from published airline timetables and official schedule data, including U.S. Department of Transportation records for domestic routes — flagging services that depart late at night and arrive the following morning; for connecting itineraries the red-eye is based on the timing of the overnight long-haul leg.",
        "toolsUsed": [
          "redeye_flights"
        ]
      },
      "q7": {
        "question": "Which airlines usually operate this route from Denver to St. Louis?",
        "answer": "Southwest Airlines, United Airlines, and Frontier Airlines operate nonstop flights from Denver to St. Louis. Southwest is the dominant carrier with 185 weekly flights, followed by United with 40 weekly flights (including 7 operated by SkyWest as United Express), and Frontier with 6 weekly flights on select days. Median fares are approximately $148 on Southwest, $160 on United, and $110 on Frontier.",
        "methodology": "Airlines and weekly frequencies come from our flight-schedule database, which combines published airline timetables, U.S. government schedule data from the Bureau of Transportation Statistics (BTS), and observed flight operations from the EUROCONTROL/OpenSky Open Performance Data Initiative (OPDI). We count each operating carrier's scheduled weekly departures and the days it flies; where there is no nonstop service, connecting carriers are identified by linking scheduled nonstop segments through common hub airports. Where a typical fare is shown for a carrier, it is the median of the real fares Priceline users found on this route in the last 72 hours.",
        "toolsUsed": [
          "route_airlines"
        ]
      },
      "q8": {
        "question": "If I need a connection, what are common layover cities between Denver and St. Louis?",
        "answer": "Common layovers for Denver to St. Louis flights include Chicago O'Hare, Dallas/Fort Worth, and Minneapolis. These hubs offer frequent connecting flights and efficient transfer processes, often keeping total travel time under five hours. As this is a domestic route, visa‑free transit is irrelevant."
      },
      "q9": {
        "question": "How reliable are on‑time arrivals on this route from Denver to St. Louis?",
        "answer": "On the Denver to St. Louis route, Frontier leads with 90.3% of flights arriving within 15 minutes of schedule and no cancellations. United follows at 79.7% on-time arrivals with a 0.1% cancellation rate, then Southwest at 74.5% on-time with 0.4% cancellations, and United Express operated by SkyWest at 68.4% on-time with 0.6% cancellations.",
        "methodology": "On-time arrival and cancellation rates come from the U.S. Bureau of Transportation Statistics (BTS) Airline On-Time Performance dataset, which covers U.S. domestic routes only; a flight counts as on time when it arrives within 15 minutes of schedule. Carriers are ranked by arrival on-time rate on this route, and the carrier list itself comes from our flight-schedule database, which combines published airline timetables, U.S. government schedule data from the Bureau of Transportation Statistics (BTS), and observed flight operations from the EUROCONTROL/OpenSky Open Performance Data Initiative (OPDI).",
        "toolsUsed": [
          "flight_schedule"
        ]
      },
      "q10": {
        "question": "Which months have the best weather for traveling to St. Louis?",
        "answer": "April to May and September to October offer pleasant temperatures and fewer tourists."
      },
      "q11": {
        "question": "What documents should I bring with me to the airport when flying from Denver to St. Louis?",
        "answer": "Acceptable ID includes a Real ID driver's license or passport. No visa or vaccination certificate is required for this domestic flight. Have a credit or debit card ready for baggage fees."
      },
      "q12": {
        "question": "Which airport should I use in St. Louis?",
        "answer": "St. Louis Lambert International Airport is the city's only commercial airport, so all flights arrive there."
      },
      "q13": {
        "question": "How do I get to Denver Intl Airport from the city center?",
        "answer": "From downtown Denver, the RTD A Line train is the most popular and often fastest option, reaching Denver International Airport in about 37 minutes with service every 15 minutes around the clock. Ride-share services like Uber and Lyft, along with taxis, take roughly 25-35 minutes and offer door-to-door convenience from Level 5. Shared vans and hotel shuttles provide another budget-friendly choice, while driving yourself means parking at one of several on-site lots or garages. The train is the cheapest at about $10 for a day pass, while ride-share and taxis are more expensive but save time.",
        "toolsUsed": [
          "article_lookup"
        ],
        "references": [
          {
            "url": "https://www.flydenver.com/parking-and-transportation/to-and-from/",
            "title": "Getting To and From | Denver International Airport",
            "favicon": "https://www.flydenver.com/apple-touch-icon.png",
            "time_published": "2026-05-15T18:36:33Z"
          },
          {
            "url": "https://flydenver.com/parking-and-transportation/to-and-from/public-bus-or-train-rtd",
            "title": "Public Bus or Train | Denver International Airport",
            "favicon": "https://flydenver.com/apple-touch-icon.png",
            "time_published": "2026-05-15T18:47:06Z"
          },
          {
            "url": "https://www.flydenver.com/parking-and-transportation/to-and-from/airport-transit-center/",
            "title": "Airport Transit Center | Denver International Airport",
            "favicon": "https://www.flydenver.com/apple-touch-icon.png",
            "time_published": "2026-05-15T18:45:07Z"
          },
          {
            "url": "https://faa.gov/air_traffic/publications/domesticnotices/dom25010_af.html",
            "title": "DENVER INTERNATIONAL AIRPORT (KDEN) standard taxi routes",
            "favicon": "https://faa.gov/air_traffic/publications/domesticnotices/assets/images/favicon.ico"
          },
          {
            "url": "https://www.fly.faa.gov/fly/flyfaa/flyfaaindex?ARPT=DEN&p=1",
            "title": "Denver International Airport"
          }
        ]
      },
      "q14": {
        "question": "Are there hotels or sleeping facilities at St. Louis airport?",
        "answer": "St. Louis Lambert International Airport has no directly connected or on-site hotel within the terminal itself. However, several hotels are located within a short drive of the airport, including the Marriott St. Louis Airport (0.3 mi), Wingate by Wyndham St. Louis Airport (0.4 mi), Drury Inn Airport St. Louis (0.4 mi), Pear Tree Inn St. Louis Airport (0.4 mi), Hampton Inn St. Louis Airport (0.6 mi), Hilton St. Louis Airport (0.6 mi), Hyatt Place St. Louis Airport (0.7 mi), and Holiday Inn Express & Suites St. Louis Airport by IHG (1 mi). Many of these hotels offer airport shuttle service, with pick-up points at Exit Door 18 in Terminal 1 and Exit Door 12 in Terminal 2.",
        "toolsUsed": [
          "article_lookup"
        ],
        "references": [
          {
            "url": "https://www.sleepinginairports.net/guides/st-louis-lambert-airport-guide.htm",
            "title": "St. Louis Lambert Airport Guide (STL) - Sleeping in Airports",
            "favicon": "https://www.sleepinginairports.net/nitropack_static/oBWrHkPujHTPIaVWqdDSDhClXUyrYhhb/assets/images/optimized/rev-b853180/www.sleepinginairports.net/wp-content/uploads/2018/09/cropped-sia-logo-180x180.png",
            "time_published": "2018-08-06T09:35:20Z"
          },
          {
            "url": "https://www.ihg.com/holidayinnexpress/hotels/th/th/st-louis/stllf/hoteldetail",
            "title": "โรงแรมในเซนต์หลุยส์ | ฮอลิเดย์ อินน์ เอ็กซ์เพรส แอนด์ สวีท สนามบินเซนต์หลุยส",
            "favicon": "https://digital.ihg.com/is/image/ihg/app-web-chiclet-holidayinnexpress?fmt=png-alpha"
          },
          {
            "url": "https://sleepinginairports.net/lounge/st-louis-airport/admirals-club-stl.htm",
            "title": "St. Louis Lambert Airport Guide (STL) - Sleeping in Airports",
            "time_published": "2026-04-13T20:29:58Z"
          }
        ]
      },
      "q15": {
        "question": "Are there currency exchange offices, prayer rooms and Wi‑Fi at Lambert Intl Airport?",
        "answer": "Lambert–St. Louis International Airport offers free Wi-Fi throughout both Terminal 1 and Terminal 2, along with ample charging stations and comfortable seating areas. A chapel is located in Terminal 2, near Concourse E.",
        "toolsUsed": [
          "article_lookup"
        ],
        "references": [
          {
            "url": "https://en.wikipedia.org/wiki/St._Louis_Lambert_International_Airport",
            "title": "St. Louis Lambert International Airport",
            "favicon": "https://en.wikipedia.org/static/apple-touch/wikipedia.png",
            "time_published": "2026-09-06T13:20:24Z"
          },
          {
            "url": "https://airport.guide/kstl/terminal-2",
            "title": "St Louis Airport (STL) | Terminal 2",
            "favicon": "https://airport.guide/apple-touch-icon.png"
          },
          {
            "url": "https://www.airport.guide/kstl",
            "title": "St Louis Airport (STL) | Terminal maps | Airport guide",
            "favicon": "https://www.airport.guide/apple-touch-icon.png"
          },
          {
            "url": "https://airport.guide/kstl/concourse-a",
            "title": "St Louis Airport (STL) | Concourse A",
            "favicon": "https://airport.guide/apple-touch-icon.png"
          },
          {
            "url": "https://en.wikipedia.org/wiki/Lambert_Airport_Terminal_2_station",
            "title": "Lambert Airport Terminal 2 station",
            "time_published": "2026-06-16T02:55:51Z"
          }
        ]
      },
      "q16": {
        "question": "Are there accessible services or children's facilities at the Denver and St. Louis airports?",
        "answer": "Denver International Airport offers electric carts to transport elderly or disabled passengers to airline gates and participates in the Hidden Disabilities Sunflower Lanyard Program; ground transportation providers like Metro Taxi recommend requesting wheelchair-accessible service 48 hours in advance at (303) 333-3333. St. Louis Lambert International Airport provides designated play areas and nursing rooms for families, along with comprehensive accessibility facilities for travelers with disabilities. Both airports support mobility assistance and family-friendly amenities, though specific children's play area details at Denver are less prominently listed.",
        "toolsUsed": [
          "article_lookup"
        ],
        "references": [
          {
            "url": "https://flydenver.com/at-the-airport/services-and-amenities/accessibility-services",
            "title": "Accessibility and Mobility | Denver International Airport",
            "favicon": "https://flydenver.com/apple-touch-icon.png",
            "time_published": "2026-08-10T20:24:04Z"
          },
          {
            "url": "https://www.flydenver.com/event/61719/",
            "title": "Accessibility Resource Fair | Denver International Airport",
            "favicon": "https://www.flydenver.com/apple-touch-icon.png",
            "time_published": "2026-07-22T17:07:58Z"
          },
          {
            "url": "https://flydenver.com/about-den/facilities",
            "title": "Airport Facilities and Grounds | Denver International Airport",
            "favicon": "https://flydenver.com/apple-touch-icon.png",
            "time_published": "2026-08-03T22:42:42Z"
          },
          {
            "url": "https://airporttech.tc.faa.gov/Products/Databases/Denver-Instrumentation/Browse-Database/Weather",
            "title": "AirportTech > Products > Databases  > Denver Instrumentation > Browse Database > Weather",
            "favicon": "https://airporttech.tc.faa.gov/Portals/0/favicon-FAA.ico?ver=L21jzf-llJYYjFtxLcsyqg%3d%3d"
          },
          {
            "url": "https://en.wikipedia.org/wiki/Denver_International_Airport",
            "title": "Denver International Airport",
            "favicon": "https://en.wikipedia.org/static/apple-touch/wikipedia.png",
            "time_published": "2026-09-11T12:43:01Z"
          },
          {
            "url": "https://en.wikipedia.org/wiki/St._Louis_Lambert_International_Airport",
            "title": "St. Louis Lambert International Airport",
            "favicon": "https://en.wikipedia.org/static/apple-touch/wikipedia.png",
            "time_published": "2026-09-06T13:20:24Z"
          },
          {
            "url": "https://en.wikipedia.org/wiki/Lambert_Airport_Terminal_2_station",
            "title": "Lambert Airport Terminal 2 station",
            "time_published": "2026-06-16T02:55:51Z"
          },
          {
            "url": "https://en.wikipedia.org/wiki/Lambert%20Airport%20Terminal%202%20station",
            "title": "Lambert Airport Terminal 2 station",
            "time_published": "2025-12-17T17:36:46Z"
          },
          {
            "url": "https://airport.guide/kstl/terminal-2",
            "title": "St Louis Airport (STL) | Terminal 2",
            "favicon": "https://airport.guide/apple-touch-icon.png"
          },
          {
            "url": "https://www.airport.guide/kstl",
            "title": "St Louis Airport (STL) | Terminal maps | Airport guide",
            "favicon": "https://www.airport.guide/apple-touch-icon.png"
          }
        ]
      },
      "q17": {
        "question": "What aircraft are typically used on flights from Denver to St. Louis?",
        "answer": "Southwest flies the most on Denver to St. Louis, using Boeing 737-700s and Boeing 737 MAX 8s. Frontier uses the Airbus A320 family, while United flies Airbus A320s and Embraer E175s (operated by SkyWest).",
        "methodology": "Aircraft types come from our flight-schedule database, which combines published airline timetables, U.S. government schedule data from the Bureau of Transportation Statistics (BTS), and observed flight operations from the EUROCONTROL/OpenSky Open Performance Data Initiative (OPDI). For U.S. routes the type is grounded in the tail number that actually operated the flight; elsewhere it comes from the airline's filed equipment code. Where the source does not commit to a specific variant we name the aircraft family (for example Airbus A320 family) rather than guess, and where no reliable type is on file the aircraft is omitted rather than estimated. Types describe typical scheduled equipment and can vary with seasonal or day-of-week assignments and last-minute swaps.",
        "toolsUsed": [
          "flight_schedule"
        ]
      },
      "q18": {
        "question": "Which airline alliances serve flights from Denver to St. Louis?",
        "answer": "United (Star Alliance) flies nonstop from Denver to St. Louis, alongside Southwest and Frontier, which belong to no global alliance. No oneworld or SkyTeam carriers operate nonstop on this route, though those alliances may serve it via connections.",
        "methodology": "Airlines and weekly frequencies are compiled from our flight-schedule database, which combines published airline timetables, U.S. government schedule data from the Bureau of Transportation Statistics (BTS), and observed flight operations from the EUROCONTROL/OpenSky Open Performance Data Initiative (OPDI). We count each operating carrier's scheduled weekly departures and the days it flies; where there is no nonstop service, connecting carriers are identified by linking scheduled nonstop segments through common hub airports. Where a median fare is shown for a carrier, it reflects the real fares Priceline users found on this route in the last 72 hours.",
        "toolsUsed": [
          "route_airlines"
        ]
      },
      "q20": {
        "question": "What are the best airport lounge options when departing from Denver?",
        "answer": "Departing from Denver, the American Airlines Admirals Club near Gate C-32 on the mezzanine level and the American Express Centurion Lounge near Gate C-46 offer lounge access. The Capital One Lounge (Plaza Premium) is near Gate A-34, and the Delta Sky Club is past security at the north end of Concourse A on the bridge from Jeppesen Terminal. United Clubs are available near Gates A-25, B-44, and B-32, with United Club Fly near Gate B-60. The USO Denver lounge is on Level 4 above the mezzanine level of the center of Concourse A.",
        "toolsUsed": [
          "article_lookup"
        ],
        "references": [
          {
            "url": "https://flydenver.com/at-the-airport/lounge-areas",
            "title": "Denver Airport Lounges | Denver International Airport",
            "favicon": "https://flydenver.com/apple-touch-icon.png",
            "time_published": "2026-08-03T22:37:03Z"
          },
          {
            "url": "https://www.flydenver.com",
            "title": "Denver International Airport | DEN",
            "favicon": "https://www.flydenver.com/apple-touch-icon.png",
            "time_published": "2026-09-08T14:54:34Z"
          },
          {
            "url": "https://americanexpress.com/en-us/travel/lounges/the-platinum-card/DEN",
            "title": "American Express Lounges at Denver International Airport | Amex US",
            "favicon": "https://www.americanexpress.com/apple-touch-icon-152x152.png"
          },
          {
            "url": "https://my.prioritypass.com/en-GB/lounges/united-states-of-america/denver-international",
            "title": "Denver International Airport DEN Lounges - DEN Airport Guide and lounges. | Priority Pass",
            "favicon": "https://my.prioritypass.com/icon.png?a4ff481221414a5c"
          }
        ]
      },
      "q21": {
        "question": "What is the baggage allowance on this route from Denver to St. Louis?",
        "answer": "This is a domestic route, so international baggage rules do not apply. Allowance depends on airline and fare: basic economy often charges for both checked and carry‑on bags, while standard economy usually includes a carry‑on and personal item. Checked bags are typically an extra fee unless you have elite status or a co‑branded credit card."
      },
      "q22": {
        "question": "What cabin and seat options are typical from Denver to St. Louis?",
        "answer": "On this domestic route, you typically find Economy and standard recliner Business or First class; flat‑bed seats and Premium Economy are uncommon."
      },
      "q23": {
        "question": "Are same‑day changes or standby possible on this route?",
        "answer": "Policies differ by carrier and fare class; flexible and premium tickets often allow same‑day changes or standby, while Basic Economy typically does not."
      }
    }
  }
}