{
  "response": {
    "Key": "DEN-WAS",
    "orig": {
      "code": "DEN",
      "type": "airport",
      "city": "Denver",
      "fullCity": "Denver, Colorado",
      "airport": "Denver Intl Airport"
    },
    "dest": {
      "code": "WAS",
      "type": "airport",
      "city": "Washington",
      "fullCity": "Washington, United States",
      "airport": "Ronald Reagan National Airport"
    },
    "faq": {
      "q0": {
        "question": "What is the typical flight duration from Denver to Washington?",
        "answer": "The flight from Denver to Washington is about 1,470 miles and typically takes 3 hours and 22 minutes nonstop. The return leg averages 3 hours and 52 minutes, making it about 30 minutes longer heading west against the prevailing winds.",
        "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 Washington?",
        "answer": "Yes, there are direct flights from Denver to Washington. United, Southwest, and Frontier all fly nonstop — United serves both Dulles and Reagan National, Southwest flies to Dulles, and Frontier flies to Reagan National. The flights run daily, with United offering up to 112 weekly departures, Southwest 76, and Frontier 21.",
        "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"
        ]
      },
      "q3": {
        "question": "What are the ground transportation options in Washington?",
        "answer": "From Washington Dulles (IAD), you can take the Silver Line Metrorail into the city via a $5 shuttle bus to the Wiehle-Reston East station, taxis and ride‑shares like Uber and Lyft are available curbside, shared vans run from the arrivals level, and rental cars are on‑site. The Metrorail is the most used option for downtown access, while a taxi or ride‑share is typically the fastest door‑to‑door.",
        "toolsUsed": [
          "article_lookup"
        ],
        "references": [
          {
            "url": "https://flydulles.com/flight-schedule-dulles-international-airport-iad",
            "title": "flydulles.com - Flight Schedule - Dulles International Airport (IAD)",
            "time_published": "2022-03-01T00:00:00Z"
          },
          {
            "url": "https://parking.flydulles.com/economy-parking",
            "title": "Dulles International Airport Parking | Economy Parking",
            "time_published": "2026-02-06T00:00:00Z"
          },
          {
            "url": "https://www.mwaa.com/ipw-2017-archived",
            "title": "IPW 2017 - Archived",
            "time_published": "2021-02-01T00:00:00Z"
          },
          {
            "url": "https://www.mwaa.com/policefireems/fire-ems/fire-ems-washington-dulles-international-airport",
            "title": "mwaa.com - Fire & EMS at Washington Dulles International Airport",
            "favicon": "https://www.mwaa.com/themes/custom/mwaa_barrio/favicon.ico",
            "time_published": "2023-09-01T00:00:00Z"
          },
          {
            "url": "https://en.wikipedia.org/wiki/Dulles%20International%20Airport",
            "title": "Dulles International Airport",
            "time_published": "2026-04-30T14:07:38Z"
          }
        ]
      },
      "q4": {
        "question": "When is the cheapest time to fly from Denver to Washington?",
        "answer": "The cheapest months to fly from Denver to Washington are April (average $325), March ($360), and August ($362), while the most expensive are October (average $488), November ($474), and June ($454).",
        "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 Washington?",
        "answer": "For flights from Denver to Washington, book 3 to 6 weeks ahead for the best fare, with an average of $196. The absolute cheapest day is 35 days out at $183, and prices rise sharply if you book more than 4 months in advance or at the last minute. During summer or holiday periods, demand may push the ideal window a bit earlier, so aim for the early side of that range.",
        "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 Washington?",
        "answer": "Yes, overnight red-eye flights are available from Denver to Washington. United operates a daily nonstop red-eye from Denver (DEN) to Washington Dulles (IAD), departing at 11:59 PM and arriving 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 Washington?",
        "answer": "United Airlines, Southwest, and Frontier operate nonstop from Denver to Washington. United flies to Dulles (IAD) with 105 weekly flights and also serves Reagan National (DCA) with 7 weekly flights. Southwest operates 76 weekly flights to Dulles, while Frontier offers 21 weekly flights to Reagan National. Median fares are not provided for these 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.",
        "toolsUsed": [
          "route_airlines"
        ]
      },
      "q8": {
        "question": "If I need a connection, what are common layover cities between Denver and Washington?",
        "answer": "Common layovers for Denver to Washington flights include Chicago O'Hare, Dallas/Fort Worth, Atlanta, and Charlotte, all major hubs offering frequent connections and efficient transfer facilities."
      },
      "q9": {
        "question": "How reliable are on‑time departures on this route from Denver to Washington?",
        "answer": "On-time arrival performance from Denver to Washington varies by carrier: United Airlines is the most reliable, with 88.4% of flights arriving on time, while Frontier and Southwest show 74.3% and 64.1% respectively. Cancellation rates are low across the board, with United at 0.0%, Frontier at 0.3%, and Southwest at 0.5%.",
        "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 Washington?",
        "answer": "April to May and September to October offer mild temperatures, cherry blossoms or fall foliage, and fewer tourists."
      },
      "q11": {
        "question": "What documents should I bring with me to the airport when flying from Denver to Washington?",
        "answer": "For domestic U.S. flights, a Real ID-compliant driver's license or passport is required; no visa or proof of onward travel is needed. Bring a payment method for baggage and any required health documents."
      },
      "q12": {
        "question": "Which airport should I use in Washington?",
        "answer": "Reagan National is closest to downtown and ideal for business and sightseeing. Dulles is the main international gateway with more long‑haul and Star Alliance flights, while Baltimore/Washington serves low‑cost carriers and is farther from central Washington."
      },
      "q13": {
        "question": "How do I get to Denver Intl Airport from the city center?",
        "answer": "The University of Colorado A Line commuter train is the fastest and most popular way to reach Denver International Airport from downtown, taking about 37 minutes from Denver Union Station. Public buses, including the RTD SkyRide, offer a cheaper alternative but are slower. Ride‑share services like Uber and Lyft, along with taxis, provide door‑to‑door convenience at a higher cost, while driving and parking on‑site is available but is the most expensive option.",
        "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 Washington airport?",
        "answer": "Washington Dulles Airport (IAD) has a Sleepbox Lounge with 16 sound-proof rooms on the airside, but there are no designated rest zones, capsule hotels, or sleeping pods in the terminals. The Washington Dulles Airport Marriott is located on airport grounds and provides a free shuttle every 15 minutes, making it a convenient option for a full hotel stay.",
        "toolsUsed": [
          "article_lookup"
        ],
        "references": [
          {
            "url": "https://sleepinginairports.net/guides/washington-dulles-airport-guide.htm",
            "title": "Washington Dulles Airport Guide (IAD) - 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": "2018-08-08T21:11:21Z"
          },
          {
            "url": "https://www.sleepinginairports.net/sleep-guide/sleeping-in-washington-dulles-airport.htm",
            "title": "Sleeping in Washington Dulles Airport",
            "time_published": "2024-09-12T00:00:00Z"
          },
          {
            "url": "https://www.marriott.com/en-us/hotels/iadap-washington-dulles-airport-marriott/overview/?scid=d2406702-e8ea-4b45-bb9b-69",
            "title": "Hotel near IAD Airport | Washington Dulles Airport Marriott",
            "time_published": "2025-02-19T00:00:00Z"
          },
          {
            "url": "https://www.marriott.com/en-us/hotels/iadap-washington-dulles-airport-marriott/overview/?scid=f2ae0541-1279-4f24-b197-a979c79310b0",
            "title": "Hotel near IAD Airport | Washington Dulles Airport Marriott",
            "time_published": "2024-10-11T00:00:00Z"
          },
          {
            "url": "https://www.flydulles.com/",
            "title": "Official Website of Washington Dulles International Airport - IAD",
            "favicon": "https://www.flydulles.com/themes/custom/mwaa_barrio/favicon.ico",
            "time_published": "2026-07-17T00:00:00Z"
          },
          {
            "url": "https://www.airportsdata.net/airport-IAD-accommodation/",
            "title": "Sleeping at Dulles airport - Washington D.C.",
            "time_published": "2025-12-01T00:00:00Z"
          }
        ]
      },
      "q15": {
        "question": "Are there currency exchange offices, prayer rooms and Wi‑Fi at Ronald Reagan National Airport?",
        "answer": "The question asks about amenities at Ronald Reagan National Airport (DCA), but the tool returned information for Washington Dulles International Airport (IAD) because WAS is a metro code and no specific article for DCA was available. At Dulles, there is an international currency exchange, an interfaith chapel, and free Wi‑Fi. The interfaith chapel is located pre‑security on the departures level near the main terminal, and free Wi‑Fi is available throughout the airport.",
        "toolsUsed": [
          "article_lookup"
        ],
        "references": [
          {
            "url": "https://www.flydulles.com/dulles-international-airport-nominated-2024-usa-todays-10best-shopping-large-airport-lounge",
            "title": "Dulles International Airport Nominated for 2024 USA Today’s ‘10Best’ Shopping, Large Airport & Lounge | flydulles.com",
            "time_published": "2022-03-01T00:00:00Z"
          },
          {
            "url": "https://flydulles.com/about-dulles-international",
            "title": "flydulles.com - About Dulles International",
            "time_published": "2022-03-01T00:00:00Z"
          },
          {
            "url": "https://mwaa.com/iad-rfi",
            "title": "mwaa.com - US DOT Request for Information to Revitalize Washington Dulles International Airport",
            "favicon": "https://mwaa.com/themes/custom/mwaa_barrio/favicon.ico"
          },
          {
            "url": "https://mwaa.com/alert/rfi-revitalize-dulles-international-airport",
            "title": "mwaa.com - US DOT Request for Information to Revitalize Washington Dulles International Airport",
            "favicon": "https://mwaa.com/themes/custom/mwaa_barrio/favicon.ico"
          },
          {
            "url": "https://en.wikipedia.org/wiki/Dulles%20International%20Airport",
            "title": "Dulles International Airport",
            "time_published": "2026-04-30T14:07:38Z"
          }
        ]
      },
      "q17": {
        "question": "What aircraft are typically used on flights from Denver to Washington?",
        "answer": "The most common aircraft on nonstop flights from Denver to Washington are the Boeing 737 MAX 8 and the Boeing 737-800, operated by Southwest and United, with United also flying the Airbus A321-200 Neo, Boeing 757-300, and Boeing 737 MAX 9 on select frequencies. Frontier's nonstop equipment is not publicly specified in the schedule, though it is typically an Airbus A320-family jet. On connecting itineraries, the long leg is predominantly a Boeing 737 MAX 8 or 737-800 via Southwest hubs like Chicago Midway, St. Louis, or Nashville; exact aircraft can vary by day and airline, and Wi‑Fi and seatback entertainment are widely available across most carriers.",
        "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 Washington?",
        "answer": "United (Star Alliance), Southwest (no alliance), and Frontier (no alliance) fly nonstop from Denver to Washington. Other alliances may serve the route 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, the Delta Sky Club is located in the Main Terminal on Concourse A, accessible to Delta Sky Club members, premium cabin passengers, and eligible American Express cardholders. The Centurion Lounge is situated in Concourse C, offering complimentary food and drinks, a bar, and workspaces for American Express Platinum and Centurion cardholders. Both lounges provide Wi-Fi and flight monitors.",
        "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 Washington?",
        "answer": "On Denver–Washington flights, Basic Economy fares often restrict carry‑ons to a personal item only and exclude checked bags. Standard economy typically includes a carry‑on and personal item, with checked bags available for a fee or included with higher fares."
      },
      "q22": {
        "question": "What cabin and seat options are typical from Denver to Washington?",
        "answer": "Flights from Denver to Washington typically offer Economy, extra‑legroom Economy, and First class with recliner seats; flat‑bed Business is rare on this domestic route."
      },
      "q23": {
        "question": "Are same‑day changes or standby possible on this route?",
        "answer": "Same‑day changes and standby depend on the airline and fare class; flexible and premium tickets often allow them, while basic economy typically does not."
      }
    }
  }
}