{
  "response": {
    "Key": "IAD-LIS",
    "orig": {
      "code": "IAD",
      "type": "airport",
      "city": "Washington",
      "fullCity": "Washington, United States",
      "airport": "Washington Intl Airport"
    },
    "dest": {
      "code": "LIS",
      "type": "airport",
      "city": "Lisbon",
      "fullCity": "Lisbon, Portugal",
      "airport": "Humberto Delgado Airport"
    },
    "faq": {
      "q0": {
        "question": "What is the typical flight duration from Washington to Lisbon?",
        "answer": "A nonstop flight from Washington Dulles (IAD) to Lisbon (LIS) typically takes about 7 hours 15 minutes. The return flight from Lisbon to Washington is often slightly longer, around 8 hours 20 minutes, due to prevailing winds. Connecting flights, commonly via European hubs like London or Frankfurt, usually range from 10 to 13 hours total travel time."
      },
      "q1": {
        "question": "Are there any direct flights from Washington to Lisbon?",
        "answer": "Yes, TAP Air Portugal and United both fly nonstop from Washington Dulles to Lisbon. Together they offer up to 57 weekly flights — TAP runs 29 and United 28, both with daily service. TAP typically has the lower fare, around $1,230, while United averages about $1,324.",
        "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"
        ]
      },
      "q2": {
        "question": "Are there visa requirements to travel from Washington to Lisbon?",
        "answer": "Yes, visa requirements apply for travel between Washington (USA) and Lisbon (Portugal). If you are a U.S. citizen, you do not need a visa for short stays (up to 90 days) in Portugal, as it is part of the Schengen Area, but from mid-2025 you will need an ETIAS travel authorization. If you are a Portuguese citizen, you do not need a visa for short visits to the U.S., but you must obtain an ESTA authorization. For other nationalities, check both U.S. and Schengen visa rules."
      },
      "q3": {
        "question": "What are the ground transportation options in Lisbon?",
        "answer": "Lisbon Airport (LIS) is just 7 km north of the city center, with the Aerobus shuttle (Lines 1 and 2) being the most popular and fastest option, reaching the center in 20–40 minutes for €4 and running every 20–25 minutes. Public buses (5, 22, 44, 45, 83) are the cheapest choice, while taxis are available at ranks outside Arrivals with a standard airport surcharge. There is no direct train from the airport, but nearby stations like Gare do Oriente connect to the metro via a short taxi ride. Ride-share services also operate, and car rentals are available at the terminal. The Aerobus is most used for its direct, frequent service and good value.",
        "toolsUsed": [],
        "references": [
          {
            "url": "http://lisbon-lis.airports-guides.com",
            "title": "Lisbon Portela Airport (LIS) Information: LIS Airport in Lisbon Area, Portugal"
          },
          {
            "url": "http://www.lisbon-lis.airports-guides.com/lis_airport_transport.html",
            "title": "Lisbon Portela Airport (LIS) Travel, Transport: Travel at Airports in Lisbon Area, Portugal",
            "time_published": "2016-03-03T00:00:00Z"
          },
          {
            "url": "https://www.lisbon-airport.net/",
            "title": "Lisbon Airport (LIS)"
          },
          {
            "url": "https://lisbonairport.net/lisbon-airport-transfers/bus/",
            "title": "Getting to Lisbon Airport by Bus",
            "time_published": "2019-03-02T00:00:00Z"
          },
          {
            "url": "https://lisbonairport.net",
            "title": "Lisbon Airport | Guide to Lisbon Airport (LIS)"
          }
        ]
      },
      "q4": {
        "question": "When is the cheapest time to fly from Washington to Lisbon?",
        "answer": "The cheapest months to fly from Washington to Lisbon are October, November, and September, with average fares around $727–$772. The most expensive months are June, July, and May, where average fares climb to $1,113–$1,279.",
        "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 Washington to Lisbon?",
        "answer": "For Washington to Lisbon, the best fares typically appear when booking 11 to 14 weeks ahead, with average prices around $1,049. The single cheapest day to book is about 90 days out, while last-minute bookings within two weeks can cost over $1,600. Summer and holiday periods tend to push optimal booking windows earlier and raise fares, so aiming for that 3–4 month lead time is a reliable strategy.",
        "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 Washington to Lisbon?",
        "answer": "Yes, overnight red-eye flights are available from Washington Dulles (IAD) to Lisbon (LIS). United operates up to 28 weekly red-eyes with departures between roughly 10:05 PM and 11:05 PM, while TAP Air Portugal offers around 13 weekly red-eyes departing between 10:30 PM and 11:30 PM, both flying daily. These flights arrive in Lisbon the next morning, with typical arrival times in the early to mid-morning hours given the roughly 7-hour flight duration.",
        "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 Washington to Lisbon?",
        "answer": "TAP Air Portugal and United fly nonstop from Washington Dulles to Lisbon, with TAP operating up to 29 weekly flights and United up to 28, both daily. Typical median fares are around $1,230 on TAP and $1,324 on United.",
        "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 Washington and Lisbon?",
        "answer": "Common layover hubs include Madrid, London, Paris and Amsterdam. These offer broad connections, efficient transfers and, for many itineraries, visa‑free transit for U.S. passport holders, keeping total travel times competitive."
      },
      "q9": {
        "question": "How reliable are on‑time departures on this route from Washington to Lisbon?",
        "answer": "On-time performance is generally reliable, though afternoon and evening flights can experience delays due to congestion or weather. Early departures, particularly on United, tend to have better punctuality."
      },
      "q10": {
        "question": "Which months have the best weather for traveling to Lisbon?",
        "answer": "May to June and September to October offer pleasant temperatures, sunny skies, and fewer tourists than the busy summer months."
      },
      "q11": {
        "question": "What documents should I bring with me to the airport when flying from Washington to Lisbon?",
        "answer": "Bring a passport valid for at least three months beyond your planned stay, proof of return or onward travel, and payment for baggage; U.S. citizens do not need a visa for short visits, but confirm any ETIAS requirements starting in 2025."
      },
      "q12": {
        "question": "Which airport should I use in Lisbon?",
        "answer": "Lisbon has only one airport, Humberto Delgado Airport, located just 7 km from downtown, serving as the primary hub for TAP Air Portugal and handling all commercial flights."
      },
      "q13": {
        "question": "How do I get to Washington Intl Airport from the city center?",
        "answer": "The fastest and most popular way to reach Dulles from downtown is the Silver Line Express bus to the Wiehle-Reston East Metrorail station, then the Silver Line train into the city; the bus runs every 15–20 minutes and costs $5 each way. Taxis and ride‑shares like Uber or Lyft offer door‑to‑door convenience but are pricier, while shared vans provide a middle ground for groups. Driving and parking is straightforward with economy lots at $15 per day and free shuttles to the terminal.",
        "toolsUsed": [],
        "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"
          }
        ]
      },
      "q14": {
        "question": "Are there hotels or sleeping facilities at Lisbon airport?",
        "answer": "Lisbon Airport (LIS) does not have on-site hotels, capsule hotels, or sleeping pods inside the terminals. The nearest hotels are located off-airport and connected by shuttle, such as the Meliá Lisboa Aeroporto and Tryp Lisboa Aeroporto Hotel, which are a short ride from Terminal 1.",
        "toolsUsed": [],
        "references": [
          {
            "url": "https://www.sleepinginairports.net/guides/lisbon-airport-guide.htm",
            "title": "Lisbon Airport Guide (LIS) - 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": "2018-09-02T00:00:05Z"
          },
          {
            "url": "https://www.sleepinginairports.net/hotels/lisbon-airport-hotels.htm",
            "title": "Lisbon Airport Guide (LIS) - Sleeping in Airports",
            "time_published": "2026-04-13T18:11:40Z"
          },
          {
            "url": "http://lisbon-lis.airports-guides.com",
            "title": "Lisbon Portela Airport (LIS) Information: LIS Airport in Lisbon Area, Portugal"
          },
          {
            "url": "http://www.lisbon-lis.airports-guides.com/lis_airport_facilities.html",
            "title": "Lisbon Portela Airport (LIS) Facilities, Info: Services at Airports in Lisbon Area, Portugal",
            "time_published": "2016-03-03T00:00:00Z"
          },
          {
            "url": "https://en.wikipedia.org/wiki/Lisbon_Airport",
            "title": "Lisbon Airport",
            "favicon": "https://en.wikipedia.org/static/apple-touch/wikipedia.png",
            "time_published": "2026-07-20T16:51:21Z"
          },
          {
            "url": "https://en.wikipedia.org/wiki/Lisbon%20Airport",
            "title": "Lisbon Airport",
            "time_published": "2026-04-30T23:41:16Z"
          }
        ]
      },
      "q17": {
        "question": "What aircraft are typically used on flights from Washington to Lisbon?",
        "answer": "The nonstop flights from Washington Dulles to Lisbon are typically operated with the Airbus A321-200 Neo (TAP Air Portugal) and the Boeing 777 (United). TAP also occasionally uses the Airbus A321-100 on this route. The exact aircraft can vary by day and airline, but these three types cover the nonstop service; Wi‑Fi and seatback entertainment are widely available on these aircraft, though specific amenities depend on the carrier and 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 Washington to Lisbon?",
        "answer": "TAP Air Portugal (Star Alliance) and United Airlines (Star Alliance) both fly nonstop from Washington Dulles to Lisbon, so Star Alliance is the only alliance with nonstop service on this route. Other alliances may offer connecting itineraries.",
        "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 Washington?",
        "answer": "At Washington Dulles, the Virgin Atlantic Clubhouse, Etihad Airways Lounge (also operating as the Chase Sapphire Lounge by The Club), and Air France/KLM Lounge are all located in Concourse A, offering stylish seating, premium food and beverages, and shower suites. In Concourse B, the Turkish Airlines Lounge provides a spacious retreat with Turkish cuisine and a business center, while the Lufthansa Business and Senator lounges are temporarily closed. The Capital One Lounge, situated pre-security near the TSA checkpoints, features locally inspired dining, workspaces, and grab-and-go options. Access is typically available to business-class passengers, elite status holders, or through lounge membership programs like Priority Pass and American Express Platinum, with day passes offered at select lounges.",
        "toolsUsed": [],
        "references": [
          {
            "url": "https://americanexpress.com/en-us/travel/lounges/the-platinum-card/IAD",
            "title": "American Express Lounges at Washington Dulles International Airport | Amex US",
            "time_published": "2026-01-01T00:00:00Z"
          },
          {
            "url": "https://prioritypass.com/en-GB/lounges/united-states-of-america/washington-dulles-international",
            "title": "Washington Dulles International Airport IAD Lounges - IAD Airport Guide and lounges.  | Priority Pass",
            "time_published": "2024-11-05T00:00:00Z"
          },
          {
            "url": "https://americanexpress.com/en-th/travel/lounges/the-platinum-card/IAD",
            "title": "American Express Lounges at Washington Dulles International Airport | Amex TH",
            "time_published": "2026-01-01T00:00:00Z"
          },
          {
            "url": "https://www.flydulles.com/travel-information/services-amenities/airport-lounges/capital-one-lounge-iad",
            "title": "Capital One Lounge - IAD | flydulles.com",
            "time_published": "2022-03-01T00:00:00Z"
          },
          {
            "url": "https://my.prioritypass.com/zh-CN/lounges/united-states-of-america/washington-dulles-international/iad6-air-france-klm-lounge",
            "title": "Air France - KLM Lounge IAD AIRPORT A 大厅 杜勒斯国际机场 (Washington DC Dulles Intl) | Priority Pass",
            "time_published": "2024-11-05T00:00:00Z"
          }
        ]
      },
      "q21": {
        "question": "What is the baggage allowance on this route from Washington to Lisbon?",
        "answer": "Baggage allowance depends on the airline and fare class. Basic economy tickets often exclude checked bags, while standard international economy typically includes one checked bag and a carry-on. Premium economy and business class fares offer more generous allowances."
      },
      "q22": {
        "question": "What cabin and seat options are typical from Washington to Lisbon?",
        "answer": "Flights from Washington Dulles to Lisbon typically offer Economy and flat‑bed Business class on TAP Air Portugal and United Airlines, with Premium Economy available on select United flights."
      },
      "q23": {
        "question": "Are same‑day changes or standby possible on this route?",
        "answer": "Policies vary by airline and fare; flexible and higher cabin tickets typically allow same‑day changes or standby, while Basic Economy generally does not."
      }
    }
  }
}