{ "response": { "Key": "LIS-IAD", "orig": { "code": "LIS", "type": "airport", "city": "Lisbon", "fullCity": "Lisbon, Portugal", "airport": "Humberto Delgado Airport" }, "dest": { "code": "IAD", "type": "airport", "city": "Washington", "fullCity": "Washington, United States", "airport": "Washington Intl Airport" }, "faq": { "q0": { "question": "What is the typical flight duration from Lisbon to Washington?", "answer": "A nonstop flight from Lisbon (LIS) to Washington Dulles (IAD) typically takes about 8 hours 15 minutes. The return nonstop from Washington to Lisbon is slightly shorter, usually around 7 hours 15 minutes due to prevailing tailwinds. With one stop, total travel time often ranges from 11 to 13 hours, depending on the layover." }, "q1": { "question": "Are there any direct flights from Lisbon to Washington?", "answer": "Yes, there are nonstop flights from Lisbon to Washington Dulles. TAP Air Portugal and United both fly the route daily, with TAP operating up to 22 weekly flights and United offering 14. TAP's departures are spread across late morning and afternoon, while United typically departs around midday.", "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" ] }, "q2": { "question": "Are there visa requirements to travel from Lisbon to Washington?", "answer": "Yes, there are visa requirements. U.S. citizens traveling from Lisbon to Washington do not need a visa for entry into the U.S., but must present a valid U.S. passport. Portuguese citizens and other eligible nationals can travel visa-free under the Visa Waiver Program if they have a valid ESTA authorization. Travelers from Portugal who are not eligible for ESTA must obtain a visa from a U.S. embassy or consulate before travel. For the reverse journey, Portuguese citizens do not need a visa to enter Portugal, and U.S. citizens can visit Portugal visa-free for up to 90 days within any 180-day period as tourists or for business, provided their passport is valid for at least three months beyond the intended stay." }, "q3": { "question": "What are the ground transportation options in Washington?", "answer": "Washington Dulles Airport is about 26 miles west of downtown DC. The Silver Line Metrorail offers a reliable and popular connection: take the $5 Silver Line Express bus to the Wiehle-Reston East station, then continue by train into the city. Taxis (Washington Flyer), ride-shares like Uber and Lyft, shared vans, and rental cars are all readily available. The Metrorail option is widely used for its cost-effectiveness and consistency, while taxis or ride-shares provide the fastest door-to-door trip.", "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" } ] }, "q4": { "question": "When is the cheapest time to fly from Lisbon to Washington?", "answer": "The cheapest months to fly from Lisbon to Washington are October, November, and September, with average fares around $727–$772, while the most expensive are June, July, and May, averaging $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. For this route, fares for the requested travel direction were unavailable, so the pattern shown is derived from the reverse direction, which shares the same seasonal demand cycle.", "toolsUsed": [ "seasonal_prices" ] }, "q5": { "question": "How far in advance should I book tickets from Lisbon to Washington?", "answer": "For the Lisbon to Washington route, the best fares are typically found when booking 11 to 14 weeks before departure, with an average price around $1,049. The absolute lowest fare appears about 90 days out at $1,039, while last-minute bookings within two weeks can cost over $1,600. During peak summer and holiday periods, demand may shift that optimal window earlier, so booking a bit further ahead is wise.", "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. For this route, fares for the requested travel direction were unavailable, so the pattern shown is derived from the reverse direction, which shares the same seasonal demand cycle.", "toolsUsed": [ "booking_timing" ] }, "q6": { "question": "Are overnight (red‑eye) flights available from Lisbon to Washington?", "answer": "No overnight (red-eye) flights are scheduled from Lisbon to Washington Dulles — neither nonstop nor connecting itineraries with a red-eye long leg operate on this route.", "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 Lisbon to Washington?", "answer": "TAP Air Portugal and United Airlines fly nonstop from Lisbon to Washington Dulles. TAP operates up to 22 weekly flights with a median fare around $1,249, while United offers 14 weekly flights with a median fare near $686.", "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 Lisbon and Washington?", "answer": "Common layovers include Madrid, London, Paris and Dublin. Madrid offers quick connections with short flight times, while Dublin provides U.S. pre-clearance, saving time on arrival. London and Paris are major hubs with frequent flights, though transit may require a visa for some nationalities." }, "q9": { "question": "How reliable are on‑time departures on this route from Lisbon to Washington?", "answer": "On-time performance is generally good, though afternoon departures can face minor delays due to airport congestion. Choosing early flights on carriers like TAP Air Portugal or United often improves your chances of a timely departure." }, "q10": { "question": "Which months have the best weather for traveling to Washington?", "answer": "April to May and September to October offer pleasant temperatures and fewer tourists than summer." }, "q11": { "question": "What documents should I bring with me to the airport when flying from Lisbon to Washington?", "answer": "Bring a passport valid for the duration of your stay, an approved ESTA or U.S. visa, proof of return or onward travel, and a payment method for baggage fees." }, "q12": { "question": "Which airport should I use in Washington?", "answer": "Washington Dulles is the primary international gateway, located 26 miles west of downtown, and is a United Airlines hub. Reagan National is closest to central DC, just across the Potomac, but mainly serves domestic routes with limited international flights. Baltimore/Washington International is further north, offers Southwest flights and some international service, and is a convenient option for the northern suburbs." }, "q13": { "question": "How do I get to Humberto Delgado Airport from the city center?", "answer": "The Aerobus shuttle (Lines 1 and 2) is the most popular option, running every 20–25 minutes from the city center to the airport in about 20–40 minutes. Public buses (routes 5, 22, 44, 45, 83) are the cheapest but slower, while taxis and ride‑share are the fastest and most convenient, taking around 15–20 minutes with a standard airport surcharge. There is no direct train, but you can take a taxi to Gare do Oriente to connect to the Metro. Driving is possible, with on‑airport parking available.", "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)" } ] }, "q14": { "question": "Are there hotels or sleeping facilities at Washington airport?", "answer": "Washington Dulles Airport does not have traditional on-site hotels, but a Sleepbox Lounge with 16 sound-proof rooms is available airside. The Washington Dulles Airport Marriott is located on airport grounds and connected by a free shuttle that runs every 15 minutes. Several other nearby hotels are within a 12-minute drive and also offer complimentary shuttle service.", "toolsUsed": [], "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" } ] }, "q17": { "question": "What aircraft are typically used on flights from Lisbon to Washington?", "answer": "Nonstop flights from Lisbon to Washington are typically operated with Boeing 777s by United and Airbus A321-200 Neos by TAP Air Portugal, with the 777 being the more common of the two. Connecting itineraries most often use Boeing 777-300ERs via Toronto or Frankfurt, Boeing 787-10s via Newark, and occasionally Airbus A340-600s or A380-800s through Frankfurt or Munich. The exact aircraft can vary by day and airline, but widebody jets dominate the long-haul legs on this route.", "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 Lisbon to Washington?", "answer": "Nonstop flights from Lisbon to Washington Dulles are operated by TAP Air Portugal and United Airlines, both members of Star Alliance — so Star Alliance is the only alliance with nonstop service on this route. OneWorld and SkyTeam may offer connecting itineraries, but no carrier from those alliances flies it nonstop, and neither TAP nor United is unaffiliated.", "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 Lisbon?", "answer": "At Lisbon Portela Airport (LIS), the primary lounge available to departing passengers is the ANA Lounge Lisbon, located in Terminal 1 after security and passport control near Gate 22 on Floor 6, accessible to both Schengen and non-Schengen flights. This lounge is open daily from 4:00 AM to 11:00 PM and offers complimentary alcoholic drinks (up to three per guest), a smoking room, air conditioning, and disabled access. Access is available to Priority Pass members, and children under 2 are admitted free; a business center is available for an additional fee. No airline-branded lounges such as a TAP Portugal lounge or United Club are confirmed at this airport.", "toolsUsed": [], "references": [ { "url": "http://lisbon-lis.airports-guides.com", "title": "Lisbon Portela Airport (LIS) Information: LIS Airport in Lisbon Area, Portugal" }, { "url": "https://my.prioritypass.com/en-GB/lounges/portugal/lisbon-portela", "title": "Lisbon Airport LIS Lounges - LIS Airport Guide and lounges. | Priority Pass", "time_published": "2024-11-05T00:00:00Z" }, { "url": "https://prioritypass.com/en-GB/lounges/portugal/lisbon-portela/lis6-ana-lounge-lisbon", "title": "ANA Lounge Lisbon LIS AIRPORT Terminal 1 Lisbon Portela | Priority Pass", "time_published": "2024-11-05T00:00:00Z" }, { "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://americanexpress.com/en-us/travel/lounges/the-platinum-card/LIS", "title": "American Express Lounges at Lisbon Portela Airport | Amex US", "favicon": "https://www.americanexpress.com/apple-touch-icon-152x152.png" } ] }, "q21": { "question": "What is the baggage allowance on this route from Lisbon to Washington?", "answer": "Baggage rules depend on the airline and fare class. Basic economy fares are usually restrictive and may not include a checked bag, while standard international economy typically includes one checked bag and a carry-on. Premium cabins offer more generous allowances." }, "q22": { "question": "What cabin and seat options are typical from Lisbon to Washington?", "answer": "Flights from Lisbon to Washington typically feature Economy, Premium Economy on select airlines, and flat‑bed Business class." }, "q23": { "question": "Are same‑day changes or standby possible on this route?", "answer": "Policies differ by airline and fare class; flexible and premium tickets often allow same‑day changes or standby, while basic economy typically does not." } } } }