{"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 to Lisbon covers about 3,580 miles. The typical outbound flight time is 7 hours and 10 minutes, while the return leg takes about 8 hours and 25 minutes—about 1 hour and 15 minutes longer because of prevailing headwinds. Both TAP Air Portugal and United operate the route daily.", "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"]}, "q3": {"question": "What are the ground transportation options in Lisbon?", "answer": "Lisbon Portela Airport (LIS) is about 7 km north of the city center, with several ground transport options. The Aerobus shuttle (Lines 1 and 2) is a popular, direct mass-transit choice, running every 20–25 minutes and reaching the city in 20–40 minutes for a €4 24-hour pass. Public buses (numbers 5, 22, 44, 45, 83) are the cheapest option and serve many areas. Taxis are available at arrivals and departures with a standard airport surcharge, and ride-share services also operate. There is no direct rail link, but nearby train stations like Gare do Oriente can be reached by taxi for onward Metro connections.", "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 $707, $723, and $762 respectively. The most expensive months are June, July, and May, where average prices climb to $1,279, $1,164, and $1,113.", "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 the best fare from Washington to Lisbon, book 11 to 14 weeks ahead — roughly 3 to 3½ months before departure — when average prices are around $1,043. The single cheapest day to book is about 95 days out, at $1,033, while waiting until just 10 days before can push fares up to $1,637. Summer and holiday periods typically see higher demand, so aiming for the early side of that window or slightly earlier can help lock in a lower price.", "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 nonstop from Washington Dulles to Lisbon. United operates up to 28 weekly red-eyes departing between roughly 10:05 PM and 11:05 PM, while TAP Air Portugal operates about 13 weekly red-eyes departing between 10:30 PM and 11:30 PM. These flights depart late evening and arrive in Lisbon 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 Washington to Lisbon?", "answer": "TAP Air Portugal and United Airlines fly nonstop from Washington Dulles to Lisbon. TAP operates 29 weekly flights, typically departing in the late afternoon or evening, with a median fare around $1,267. United offers 28 weekly flights, also in the evening, with a median fare near $1,282.", "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 cities include London, Paris, Amsterdam and Frankfurt. London Heathrow offers broad connections, while Paris Charles de Gaulle and Amsterdam Schiphol provide efficient single-terminal transfers. Frankfurt is a major hub with quick connections. All allow visa‑free transit for eligible passengers."}, "q10": {"question": "Which months have the best weather for traveling to Lisbon?", "answer": "May, June, and September offer pleasant temperatures 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 stay, any required visa or ETIAS authorization once implemented, proof of onward or return travel, a payment method for bags, and any vaccination or insurance documents."}, "q12": {"question": "Which airport should I use in Lisbon?", "answer": "Lisbon has only one airport, Humberto Delgado Airport, which serves all flights and is located about 7 km from the city centre."}, "q13": {"question": "How do I get to Washington Intl Airport from the city center?", "answer": "From downtown Washington, D.C., the fastest and most popular way to reach Dulles International Airport (IAD) is the Silver Line Metrorail, which connects via a short ride on the Silver Line Express bus from the Wiehle-Reston East station. Ride-share services like Uber and Lyft offer door-to-door convenience, while Washington Flyer taxis are available 24/7 from the terminal. Shared van services such as SuperShuttle provide a budget-friendly group option, and driving yourself is possible with on-site economy parking at $15 per day and free shuttle buses to the terminal. Public transit is generally the cheapest, with taxis and ride-shares costing more but offering direct service.", "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 does not have an on-site hotel, capsule hotel, or sleeping pods inside the terminal. The closest option is the Meliá Lisboa Aeroporto, located just 100 meters from Terminal 1 and connected by a covered walkway, so no shuttle is needed. Other nearby hotels, like the Star Inn Lisbon Airport and TRYP Lisboa Aeroporto, are within a short walk or a quick complimentary shuttle ride.", "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"}]}, "q15": {"question": "Are there currency exchange offices, prayer rooms and Wi‑Fi at Humberto Delgado Airport?", "answer": "Humberto Delgado Airport (Lisbon) has currency exchange offices and ATMs throughout the terminal, including in the arrivals and departures areas. A multi-faith prayer room is available on the upper level of the terminal near the chapel. Free unlimited Wi‑Fi is provided airport‑wide.", "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_airlines.html", "title": "Lisbon Portela Airport (LIS) Airlines and Terminals: Airlines 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://www.lisbon-airport.net/", "title": "Lisbon Airport (LIS)"}, {"url": "https://lisbonairport.net", "title": "Lisbon Airport | Guide to Lisbon Airport (LIS)"}]}, "q17": {"question": "What aircraft are typically used on flights from Washington to Lisbon?", "answer": "Nonstop flights from Washington–Dulles to Lisbon are typically operated with Airbus A321neos (by TAP Air Portugal) and Boeing 777s (by United). Connecting itineraries most often use Airbus A321neos via Boston, Newark, or Dublin on TAP, or widebodies like the Airbus A330-300, Boeing 777-300ER, and Boeing 787-9 via Montréal, Toronto, or Philadelphia on Air Canada and American. The exact aircraft can vary by day and airline, and Wi‑Fi with seatback entertainment is widely available on these long‑haul services.", "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"]}, "q20": {"question": "What are the best airport lounge options when departing from Washington?", "answer": "At Washington Dulles (IAD), you’ll find several airline-branded lounges in Concourse A, including the Virgin Atlantic Clubhouse, the Etihad Airways Lounge (which also serves as a Chase Sapphire Lounge by The Club), and the Air France/KLM Lounge. In Concourse B, the Turkish Airlines Lounge is open, while the Lufthansa Business and Senator Lounges are temporarily closed. There is also a Capital One Lounge on the ticketing level before security, offering freshly prepared food and grab-and-go options. Access to the airline lounges generally requires a same-day business- or first-class ticket, elite status in the operating carrier’s program or a partner alliance, or a qualifying credit card (such as Amex Platinum for the Virgin Atlantic Clubhouse or Priority Pass for the Air France/KLM Lounge), and the Capital One Lounge welcomes eligible Capital One cardholders.", "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 on Washington to Lisbon flights depends on the airline and fare class. Basic economy tickets are restrictive and may not include a checked bag. Standard international economy fares typically include one free checked bag and one carry‑on."}, "q22": {"question": "What cabin and seat options are typical from Washington to Lisbon?", "answer": "Flights from Washington to Lisbon typically offer Economy and flat‑bed Business class; Premium Economy is available on select airlines."}, "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 generally allow them, while basic economy fares do not."}}}}