{
  "response": {
    "Key": "CHI-STL",
    "orig": {
      "code": "CHI",
      "type": "airport",
      "city": "Chicago",
      "fullCity": "Chicago, Illinois",
      "airport": "Dupage County"
    },
    "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 Chicago to St. Louis?",
        "answer": "A nonstop flight from Chicago (ORD or MDW) to St. Louis (STL) typically takes about 1 hour 10 minutes to 1 hour 30 minutes. Flights with one stop are uncommon on this short route and would significantly increase travel time, often to 3–5 hours depending on the layover city."
      },
      "q1": {
        "question": "Are there any direct flights from Chicago to St. Louis?",
        "answer": "Yes, there are nonstop flights from Chicago to St. Louis every day. Southwest runs about 150 weekly nonstops from Midway, while American and United together offer roughly 280 weekly nonstops from O'Hare — all operating daily. Typical fares range from around $153 on Southwest to about $230 on the regional carriers.",
        "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 and weekly frequencies are summarized 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). Where available, on-time and cancellation rates come from the U.S. Bureau of Transportation Statistics (BTS) Airline On-Time Performance dataset, and typical fares 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": "From St. Louis Lambert International Airport, the MetroLink light rail provides a direct and economical ride downtown in about 30 minutes, making it the most-used option. Taxis, Uber, and Lyft offer door-to-door convenience with a typical drive of 20–30 minutes. Several major car rental agencies operate on-site for those preferring to drive themselves. The light rail is generally the fastest and most popular choice for reaching the city center.",
        "toolsUsed": [],
        "references": [
          {
            "url": "https://airport.guide/kstl",
            "title": "St Louis Airport (STL) | Terminal maps | Airport guide",
            "time_published": "2026-01-01T00:00:00Z"
          },
          {
            "url": "https://www.airport.guide/kstl",
            "title": "St Louis Airport (STL) | Terminal maps | Airport guide",
            "time_published": "2026-01-01T00:00:00Z"
          },
          {
            "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": "2026-07-15T19:57:22Z"
          },
          {
            "url": "https://en.wikipedia.org/wiki/St.%20Louis%20Airport",
            "title": "St. Louis Airport",
            "time_published": "2022-05-18T03:16:52Z"
          },
          {
            "url": "https://www.airport.guide/kstl/parking",
            "title": "St Louis Airport (STL) Parking Rates and Map",
            "time_published": "2026-04-20T00:00:00Z"
          }
        ]
      },
      "q4": {
        "question": "When is the cheapest time to fly from Chicago to St. Louis?",
        "answer": "The cheapest months to fly from Chicago to St. Louis are August and September, with average fares around $336, while May is also affordable at $347. The most expensive months are March (averaging $464), June ($417), and April ($414).",
        "methodology": "This 'good deal' estimate shows a representative best price for each departure date across roughly a 12-month window (about 3 months back and 9 months forward). It is built from real flight prices found by Priceline users searching this route, accumulated into a price history for each departure date. Rather than weighting all of that history equally, we apply exponential time decay so recent prices dominate — a price seen yesterday counts almost in full, one from about a month ago roughly a third, and prices from a few months back very little — giving a figure that tracks today's market instead of a stale long-run average. Clear price outliers are removed before any calculation, departure dates with no observations are filled in from nearby dates, and the resulting curve is lightly smoothed so it reads as a clean seasonal trend rather than day-to-day noise.",
        "toolsUsed": [
          "seasonal_prices"
        ]
      },
      "q5": {
        "question": "How far in advance should I book tickets from Chicago to St. Louis?",
        "answer": "For the best fare on flights from Chicago to St. Louis, aim to book 3 to 6 weeks ahead, when prices average around $219. Booking 130 days out can yield the absolute lowest fare of about $185, while last-minute tickets within 5 days of departure climb significantly, averaging $298 or more. During peak summer and holiday periods, demand is higher, so extending the window to 6–8 weeks ahead helps secure a better deal.",
        "methodology": "This booking-window guidance is built from the same real flight prices found by Priceline users searching this route, re-grouped by how many days before departure each price was seen (from the departure day out to about 180 days ahead) across the route's price history. At each booking lead time we report the 25th-percentile price — the cheaper end of what travelers were quoted, rather than the rock-bottom minimum (which can be a fluke) or the average (which is pulled up by expensive last-minute fares). The buy-or-wait advice then applies a risk premium that grows as departure approaches, since seat availability shrinks and prices become less predictable; using that adjusted curve we flag windows where waiting is likely to save a meaningful amount (at least $20 or 5%) versus windows where booking now is the better call. Isolated single-day recommendations are filtered out, so the advice only reflects a window that holds for several days in a row.",
        "toolsUsed": [
          "booking_timing"
        ]
      },
      "q6": {
        "question": "Are overnight (red‑eye) flights available from Chicago to St. Louis?",
        "answer": "Yes, overnight red‑eye flights are available from Chicago to St. Louis. American Airlines operates the most, departing O'Hare around 10:09 PM to 10:38 PM, while Southwest departs Midway roughly 9:30 PM to 10:50 PM and United departs O'Hare around 9:20 PM. The flight is short — about an hour — so these late departures land in St. Louis before midnight the same evening.",
        "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 Chicago to St. Louis?",
        "answer": "Southwest flies nonstop from Chicago Midway to St. Louis with about 150 weekly flights, while American and United share service from Chicago O'Hare on a mix of mainline and regional aircraft totaling around 284 weekly departures. American operates its own metal as well as flights under the American Eagle brand (operated by Envoy and Republic), and United uses both mainline and United Express (operated by SkyWest and Republic). Specific median fares aren't listed, but Southwest is typically the low-cost benchmark on this route.",
        "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"
        ]
      },
      "q8": {
        "question": "If I need a connection, what are common layover cities between Chicago and St. Louis?",
        "answer": "Direct flights are the norm on this short route, but if you need a connection, common hubs include Minneapolis, Detroit, or Dallas/Fort Worth. These offer efficient transfers and broad domestic networks, though total travel time will be significantly longer than non‑stop options."
      },
      "q9": {
        "question": "How reliable are on‑time departures on this route from Chicago to St. Louis?",
        "answer": "On-time performance is generally reliable, though afternoon thunderstorms can cause delays. Early morning flights, especially from O'Hare on United or American, tend to depart on time."
      },
      "q10": {
        "question": "Which months have the best weather for traveling to St. Louis?",
        "answer": "April to May and September to October offer mild temperatures and fewer tourists."
      },
      "q11": {
        "question": "What documents should I bring with me to the airport when flying from Chicago to St. Louis?",
        "answer": "For domestic flights within the U.S., bring a Real ID or passport, ensure the name matches your ticket, and carry a payment method for baggage. No visa or vaccination certificates are required."
      },
      "q12": {
        "question": "Which airport should I use in St. Louis?",
        "answer": "St. Louis Lambert International Airport is the primary commercial airport serving the city."
      },
      "q13": {
        "question": "How do I get to Dupage County from the city center?",
        "answer": "DuPage Airport (DPA) is a general aviation airport about 29 miles west of downtown Chicago, with no direct public transit connection from the city center. The most practical options are driving, which takes roughly 45–60 minutes via I-290 and I-88, or using a ride‑share/taxi for a door‑to‑door trip. There are no regular shuttle buses or Metra trains directly serving the airport; the nearest Metra station is in West Chicago, still requiring a short taxi or ride‑share. Driving is typically the fastest and most popular choice, while ride‑shares offer convenience at a higher cost.",
        "toolsUsed": [],
        "references": [
          {
            "url": "https://en.wikipedia.org/wiki/DuPage_Airport",
            "title": "DuPage Airport",
            "favicon": "https://en.wikipedia.org/static/apple-touch/wikipedia.png",
            "time_published": "2026-07-16T20:45:00Z"
          },
          {
            "url": "https://en.wikipedia.org/wiki/Transportation_in_Chicago",
            "title": "Transportation in Chicago",
            "favicon": "https://en.wikipedia.org/static/apple-touch/wikipedia.png",
            "time_published": "2026-05-15T02:56:07Z"
          },
          {
            "url": "https://en.wikipedia.org/wiki/DuPage%20Airport",
            "title": "DuPage Airport",
            "time_published": "2026-03-13T22:38:40Z"
          },
          {
            "url": "https://en.wikipedia.org/wiki/Transportation%20in%20Chicago",
            "title": "Transportation in Chicago",
            "time_published": "2026-04-13T06:59:09Z"
          },
          {
            "url": "https://en.wikipedia.org/wiki/Chicago%20Executive%20Airport",
            "title": "Chicago Executive Airport",
            "time_published": "2026-03-26T11:15:20Z"
          }
        ]
      },
      "q14": {
        "question": "Are there hotels or sleeping facilities at St. Louis airport?",
        "answer": "St. Louis Lambert International Airport (STL) does not have an on-site hotel, capsule hotel, or sleeping pods inside the terminals. However, the Renaissance St. Louis Airport Hotel is located nearby and offers a complimentary shuttle to and from the airport for guests.",
        "toolsUsed": [],
        "references": [
          {
            "url": "https://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": "2026-05-30T00:57:38Z"
          },
          {
            "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"
          },
          {
            "url": "https://airport.guide/kstl",
            "title": "St Louis Airport (STL) | Terminal maps | Airport guide",
            "time_published": "2026-01-01T00:00:00Z"
          },
          {
            "url": "https://www.marriott.com/en-us/hotels/stlsa-renaissance-st-louis-airport-hotel/overview/?gclid=8030245d09671d030bbc421df72c6641&gclsrc=3p.ds&cid=PAI_GLB0004YXE_GLE000BIMM_GLF000OETR",
            "title": "Hotels near St. Louis Airport | Renaissance St. Louis Airport Hotel",
            "time_published": "2024-10-11T00:00:00Z"
          },
          {
            "url": "http://activities.marriott.com/north-america/usa/missouri/st.-louis/activities/arrival_transfer_st_louis_airport_stl_to_st_louis_by_car_or_suv-X1B5YX",
            "title": "Arrival transfer St. Louis Airport STL to St. Louis by Car or SUV",
            "time_published": "2026-05-01T00:00:00Z"
          },
          {
            "url": "https://www.airport.guide/kstl/parking",
            "title": "St Louis Airport (STL) Parking Rates and Map",
            "time_published": "2026-04-20T00:00:00Z"
          }
        ]
      },
      "q15": {
        "question": "Are there currency exchange offices, prayer rooms and Wi‑Fi at Lambert Intl Airport?",
        "answer": "Lambert International Airport offers free Wi‑Fi throughout both terminals. The airport guide does not mention currency exchange offices or prayer rooms, so those amenities may not be available or are not publicly listed.",
        "toolsUsed": [],
        "references": [
          {
            "url": "https://airport.guide/kstl",
            "title": "St Louis Airport (STL) | Terminal maps | Airport guide",
            "favicon": "https://airport.guide/apple-touch-icon.png"
          },
          {
            "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": "2026-07-15T19:57:22Z"
          },
          {
            "url": "https://www.airport.guide/kstl",
            "title": "St Louis Airport (STL) | Terminal maps | Airport guide",
            "time_published": "2026-01-01T00:00:00Z"
          },
          {
            "url": "https://en.wikipedia.org/wiki/St.%20Louis%20Lambert%20International%20Airport",
            "title": "St. Louis Lambert International Airport",
            "time_published": "2026-05-01T13:15:49Z"
          },
          {
            "url": "https://en.wikipedia.org/wiki/Lambert%20Airport%20Terminal%202%20station",
            "title": "Lambert Airport Terminal 2 station",
            "time_published": "2025-12-17T17:36:46Z"
          }
        ]
      },
      "q17": {
        "question": "What aircraft are typically used on flights from Chicago to St. Louis?",
        "answer": "The most common aircraft on nonstop flights from Chicago to St. Louis are the Bombardier CRJ-550 (primarily on United), the Embraer 170/175 series (on American and United), and Boeing 737 variants including the 737-800, 737 MAX 8, and 737 MAX 9 (on United and Southwest). Southwest also operates an unspecified type on many of its flights, while the Airbus A319 also appears on American. The exact aircraft can vary by day and airline, and on connecting itineraries Boeing 737-800s and 737 MAX 8s are typical on the longer legs through hubs like Dallas/Fort Worth, Charlotte, or Nashville. Wi-Fi and seatback entertainment are widely available across these aircraft types, though the specific offerings depend on the airline and the individual aircraft configuration.",
        "methodology": "Aircraft types are taken from the equipment each operating carrier schedules on this route, drawn from published airline timetables and airline equipment schedules in our flight-schedule database. They describe typical scheduled aircraft and can vary with seasonal or day-of-week assignments and last-minute equipment swaps.",
        "toolsUsed": [
          "route_aircraft"
        ]
      },
      "q18": {
        "question": "Which airline alliances serve flights from Chicago to St. Louis?",
        "answer": "American Airlines (oneworld) and United Airlines (Star Alliance) serve Chicago to St. Louis nonstop, along with Southwest, which belongs to no alliance. Other alliances may reach St. Louis from Chicago via connections, but no other carriers offer nonstop service on the route.",
        "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. 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": [
          "route_airlines",
          "redeye_flights"
        ]
      },
      "q20": {
        "question": "What are the best airport lounge options when departing from Chicago?",
        "answer": "When departing from Chicago O'Hare (ORD), you'll find a range of airline-branded lounges including United Clubs (multiple locations in Terminals 1 and 2), a United Polaris Lounge in Terminal 1 for international business class passengers, an American Airlines Admirals Club in Terminal 3, and a Delta Sky Club in Terminal 5. The Swissport Lounge in Terminal 5 offers access via Priority Pass and day passes, while the Air France-KLM Lounge in Terminal 5 serves eligible business class and elite passengers. Chicago Midway (MDW) has no airline-branded lounges, though there is a USO lounge for military personnel.",
        "toolsUsed": [],
        "references": [
          {
            "url": "https://en.wikipedia.org/wiki/DuPage_Airport",
            "title": "DuPage Airport",
            "favicon": "https://en.wikipedia.org/static/apple-touch/wikipedia.png",
            "time_published": "2026-07-16T20:45:00Z"
          },
          {
            "url": "https://www.americanexpress.com/en-us/travel/lounges/the-platinum-card/CAN/Premium-Lounge-Terminal-1-International-iUec4avgfK/?inav=en_us_menu_travel_travel_services_airport_lounge_access_by_card",
            "title": "Premium Lounge at Guangzhou Baiyun International Airport | Amex US",
            "time_published": "2026-01-01T00:00:00Z"
          },
          {
            "url": "https://www.americanexpress.com/en-us/travel/lounges/the-centurion-card-idc-en/ORD/Swissport-Lounge-Terminal-5-Concourse-M-5mTKilCqDl/",
            "title": "Swissport Lounge at O'Hare International Airport | Amex US",
            "time_published": "2026-01-01T00:00:00Z"
          },
          {
            "url": "https://en.wikipedia.org/wiki/DuPage%20Airport",
            "title": "DuPage Airport",
            "time_published": "2026-03-13T22:38:40Z"
          },
          {
            "url": "http://delta.com/content/www/en_US/traveling-with-us/airports-and-aircraft/airports/airport-services/hawaii-idaho-illinois-indiana-iowa.html",
            "title": "Airport Services in Hawaii, Idaho, Illinois, Indiana and Iowa | Delta Air Lines",
            "time_published": "2023-01-01T00:00:00Z"
          }
        ]
      },
      "q21": {
        "question": "What is the baggage allowance on this route from Chicago to St. Louis?",
        "answer": "On domestic flights from Chicago to St. Louis, baggage policies vary by airline and fare. Basic economy often restricts carry‑ons to a small personal item and charges for checked bags. Standard economy typically includes a carry‑on and personal item, with checked bags available for a fee, while premium fares may include checked baggage."
      },
      "q22": {
        "question": "What cabin and seat options are typical from Chicago to St. Louis?",
        "answer": "On this short domestic route, you'll typically find only Economy class with standard seats, and occasionally a larger regional jet with a domestic First class cabin that does not feature flat-bed seats."
      },
      "q23": {
        "question": "Are same‑day changes or standby possible on this route?",
        "answer": "Policies differ by airline and fare; flexible and premium tickets usually allow same‑day changes or standby, while Basic Economy generally does not."
      }
    }
  }
}