{"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": "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": ["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": "From St. Louis Lambert International Airport, the MetroLink light rail offers a direct and economical ride to downtown in about 30 minutes, making it the most-used option. Taxis and ride-share services like Uber and Lyft are readily available at the terminals, providing a faster door-to-door trip in roughly 20 minutes. Several major rental car agencies operate on-site for those needing a vehicle. The MetroLink is generally the best balance of cost and convenience, while ride-share or taxi is quickest.", "toolsUsed": ["article_lookup"], "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 Denver to St. Louis?", "answer": "September is the cheapest month to fly from Denver to St. Louis, with fares around $234, while July and June are the most expensive at $347 and $343 respectively.", "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 Denver to St. Louis?", "answer": "For Denver to St. Louis, booking 2 to 5 weeks ahead typically yields the best fares, averaging around $128, with the absolute cheapest day being about 30 days out at $120. During peak summer and holiday periods, demand can push prices higher, so aiming for the earlier end of that window or even a bit further out may help lock in a better rate.", "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 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, United, and Frontier operate nonstop flights from Denver to St. Louis. Southwest is the dominant carrier with 185 weekly flights, United offers 40 weekly flights (including some operated by SkyWest), and Frontier runs 6 weekly flights. Median fares are not available for 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 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 stands out with the most reliable on-time arrivals at 90.3% and a cancellation rate of 0.0%. United follows at 79.7% on-time with 0.1% cancellations, while Southwest and United Express (operated by SkyWest) trail at 74.5% and 68.4% respectively.", "methodology": "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": ["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": "The A Line commuter train is the most popular and reliable option, connecting Denver Union Station downtown directly to the airport in about 37 minutes with frequent daily departures. Ride‑share services like Uber and Lyft, as well as taxis, offer door‑to‑terminal convenience and are faster than the train, though significantly more expensive. Several shared‑van shuttles and regional buses also serve the airport from various points in the city. Driving and parking yourself is possible but takes the longest and can be costly for extended stays, though it may be practical for short trips.", "toolsUsed": ["article_lookup"], "references": [{"url": "https://www.flydenver.com/parking-and-transportation/to-and-from/airport-transit-center/", "title": "Airport Transit Center | Denver International Airport", "time_published": "2026-02-24T17:09:34Z"}, {"url": "https://flydenver.com/connections/", "title": "Connections | Denver International Airport", "favicon": "https://flydenver.com/apple-touch-icon.png", "time_published": "2023-09-14T15:33:21Z"}, {"url": "https://en.wikipedia.org/wiki/Automated_Guideway_Transit_System_(Denver_International_Airport)", "title": "Automated Guideway Transit System (Denver International Airport)", "time_published": "2026-06-01T08:54:40Z"}, {"url": "https://en.wikipedia.org/wiki/Denver%20International%20Airport", "title": "Denver International Airport", "time_published": "2026-04-30T15:08:23Z"}, {"url": "https://www.faa.gov/?action=searchForAirport&airportcode=PSR", "title": "Federal Aviation Administration", "favicon": "https://www.faa.gov/themes/custom/faa/favicon.png", "time_published": "2026-07-17T12:00:00Z"}]}, "q14": {"question": "Are there hotels or sleeping facilities at St. Louis airport?", "answer": "St. Louis Lambert International Airport does not have on-site hotels, capsule hotels, or sleeping pods. However, the Renaissance St. Louis Airport Hotel is nearby and offers a complimentary shuttle to and from the airport. Passengers can also rest airside in Terminal 2 and Concourse C, where armrest-free seating is available, though the airport can be cold, so a blanket is recommended.", "toolsUsed": ["article_lookup"], "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": "St. Louis Lambert International Airport (STL) offers free Wi‑Fi throughout both terminals, so you can stay connected after landing. However, the airport does not have dedicated currency exchange offices or prayer rooms/chapels; travelers needing foreign currency should plan ahead or use services in downtown St. Louis. For quiet reflection, the airport’s nursing rooms and seating areas may offer some privacy, but no multi‑faith spaces are provided.", "toolsUsed": ["article_lookup"], "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"}]}, "q16": {"question": "Are there accessible services or children's facilities at the Denver and St. Louis airports?", "answer": "At Denver International Airport, wheelchair assistance and other accommodations can be arranged by contacting your airline at least 48 hours before departure, with service animals permitted throughout the terminal. St. Louis Lambert International Airport prioritizes accessibility with wheelchair-accessible facilities, visual and audio aids, and trained staff, plus designated children's play areas and nursing rooms for families.", "toolsUsed": ["article_lookup"], "references": [{"url": "https://www.flydenver.com/traveler_services/accessibility", "title": "Accessibility and Mobility | Denver International Airport", "time_published": "2026-04-02T20:29:43Z"}, {"url": "https://www.flydenver.com/event/61719/", "title": "| Denver International Airport", "favicon": "https://www.flydenver.com/apple-touch-icon.png", "time_published": "2026-07-09T15:14:02Z"}, {"url": "https://en.wikipedia.org/wiki/Automated_Guideway_Transit_System_(Denver_International_Airport)", "title": "Automated Guideway Transit System (Denver International Airport)", "time_published": "2026-06-01T08:54:40Z"}, {"url": "https://en.wikipedia.org/wiki/Denver%20International%20Airport", "title": "Denver International Airport", "time_published": "2026-04-30T15:08:23Z"}, {"url": "https://www.faa.gov/?action=searchForAirport&airportcode=PSR", "title": "Federal Aviation Administration", "favicon": "https://www.faa.gov/themes/custom/faa/favicon.png", "time_published": "2026-07-17T12:00:00Z"}, {"url": "https://airport.guide/kstl", "title": "St Louis Airport (STL) | Terminal maps | Airport guide", "favicon": "https://airport.guide/apple-touch-icon.png"}, {"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%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 Denver to St. Louis?", "answer": "The most common aircraft on the nonstop Denver–St. Louis route are the Boeing 737-800, Boeing 737 MAX 8, and Airbus A320-100, all operated by Southwest and United. Some Southwest flights show an unspecified type, which is typically another 737 variant. On connecting itineraries, the same 737 models dominate the long legs, often routing through Chicago Midway, Dallas–Fort Worth, or Nashville, with shorter regional jets like the Canadair Regional Jet or Embraer 175 on the feeder segments. Wi‑Fi and seatback entertainment are widely available across these fleets, though the exact aircraft can vary by day and airline.", "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 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": "At Denver International Airport, you can access the Delta Sky Club in the Main Terminal, Concourse A, offering amenities like premium food, beer and wine, Wi-Fi, and flight monitors. The Centurion Lounge is located in Concourse C, though specific details on its features are limited. Eligibility for the Delta Sky Club typically includes Delta One or SkyTeam premium cabin passengers, elite status holders, or those with a qualifying credit card or day pass. The Centurion Lounge is accessible to American Express Platinum and Centurion cardholders, with guest policies varying by card. Both lounges provide a comfortable space to relax before your flight to St. Louis.", "toolsUsed": ["article_lookup"], "references": [{"url": "https://americanexpress.com/en-gb/travel/lounges/the-platinum-card/DEN", "title": "American Express Lounges at Denver International Airport | Amex GB", "time_published": "2026-05-03T00:00:00Z"}, {"url": "https://www.flydenver.com/", "title": "Denver International Airport | DEN", "favicon": "https://www.flydenver.com/apple-touch-icon.png", "time_published": "2026-06-02T21:34:27Z"}, {"url": "https://flydenver.com/at-the-airport", "title": "Exciting Things to Do at Denver International Airport", "time_published": "2026-02-18T15:39:31Z"}, {"url": "https://www.americanexpress.com/en-us/travel/lounges/the-centurion-card-idc-en/DEN/Delta-Sky-Club-Main-Terminal-Concourse-A-IgRTEiZDls/", "title": "Delta Sky Club at Denver International Airport | Amex US", "time_published": "2026-03-18T00:00:00Z"}, {"url": "https://carsandstays.delta.com/Denver-Hotels-Sleep-Inn-Suites-Denver-International-Airport.h23533743.Hotel-Information?categorySearch=any_option&chkin=2026-07-06&chkout=2026-07-07&destType=MARKET&destination=Denver%2C+CO%2C+United+States+of+America+%28DEN-All+Airports%29&latLong=39.74483000000001%2C-104.94829500000002&pwa_ts=1782175590171&referrerUrl=aHR0cHM6Ly9jYXJzYW5kc3RheXMuZGVsdGEuY29tL0hvdGVsLVNlYXJjaA%3D%3D&regionId=6139084&rfrr=HSR&rm1=a2&searchId=b9103c12-38ab-46f5-86a7-f3447411bdbe&selectedRatePlan=383244565&selectedRoomType=218717901&sort=RECOMMENDED&top_cur=USD&top_dp=126&useRewards=false&x_pwa=1", "title": "Sleep Inn & Suites Denver International Airport", "favicon": "https://carsandstays.delta.com/favicon.ico", "time_published": "2026-06-23T09:32:24Z"}]}, "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."}}}}