{
  "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 D.C.",
      "fullCity": "Washington D.C., United States",
      "airport": "Washington Intl Airport"
    },
    "faq": {
      "q0": {
        "question": "What is the typical flight duration from Lisbon to Washington D.C.?",
        "answer": "A nonstop flight from Lisbon (LIS) to Washington D.C. (IAD) typically takes about 8 hours 15 minutes to 8 hours 30 minutes. With one stop, common layover cities include London, Madrid, or New York, bringing total travel time to roughly 11 to 14 hours. The return flight from Washington D.C. to Lisbon is usually shorter, averaging around 7 hours 15 minutes to 7 hours 30 minutes due to prevailing winds. TAP Air Portugal and United offer nonstop service with similar durations."
      },
      "q1": {
        "question": "Are there any direct flights from Lisbon to Washington D.C.?",
        "answer": "Yes, two airlines fly nonstop from Lisbon to Washington Dulles: TAP Air Portugal (TP) operates about 3–4 daily flights with multiple departure times between late morning and late afternoon, and United Airlines (UA) runs roughly 2 daily flights around midday. Both carriers operate daily, so nonstops are available every day of the week.",
        "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. 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 D.C.?",
        "answer": "Yes, visa requirements apply when traveling from Lisbon, Portugal (LIS) to Washington D.C., United States (IAD), and they depend on your nationality. If you are a U.S. citizen, you do not need a visa to enter the U.S., but you must present a valid U.S. passport. If you are a Portuguese citizen, you can travel to the U.S. under the Visa Waiver Program for tourism or business stays of 90 days or less, provided you have a valid ESTA authorization obtained online before travel. If you are a national of another country, you may need a visa or ESTA depending on your citizenship. Always check current requirements with official sources, as rules can change."
      },
      "q3": {
        "question": "What are the ground transportation options in Washington D.C.?",
        "answer": "From Washington Dulles (IAD) to downtown D.C., the Silver Line Metro offers a direct connection to the city center in about fifty-five minutes and is the most used option for its reliability and low cost. The express bus 5A to Rosslyn and L'Enfant Plaza is another affordable choice but takes roughly sixty minutes. Taxis and ride-share services are available curbside, with travel times of thirty-five to fifty minutes depending on traffic, but are significantly more expensive. Car rentals are available at the airport but are not recommended for city travel due to congestion and expensive parking. Overall, the Metro is the preferred choice for most travelers heading to central Washington, D.C."
      },
      "q4": {
        "question": "When is the cheapest time to fly from Lisbon to Washington D.C.?",
        "answer": "The cheapest months to fly from Lisbon to Washington D.C. are November (average $802), October ($810), and September ($836), while the most expensive months are June ($1263), May ($1108), and July ($1096). The low season runs November, October, September, and February, with shoulder months in March, April, January, and August, and high season in December, July, May, and June.",
        "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.",
        "relevant": true,
        "toolsUsed": [
          "seasonal_prices"
        ]
      },
      "q5": {
        "question": "How far in advance should I book tickets from Lisbon to Washington D.C.?",
        "answer": "For the best fare from Lisbon to Washington D.C., aim to book 8 to 11 weeks ahead, where average prices hover around $1,041. The cheapest day to book is about 55 days out at $1,027, while last‑minute tickets can spike to over $1,600; you’ll want to allow even more lead time during summer and holiday peaks when demand pushes prices higher.",
        "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.",
        "relevant": true,
        "toolsUsed": [
          "booking_timing"
        ]
      },
      "q6": {
        "question": "Are overnight (red‑eye) flights available from Lisbon to Washington D.C.?",
        "answer": "No overnight (red-eye) flights are available on the Lisbon (LIS) to Washington D.C. (IAD) route — there are no nonstop red-eyes and no connecting itineraries with a red-eye long leg found in the schedule data.",
        "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 D.C.?",
        "answer": "Nonstop flights from Lisbon (LIS) to Washington D.C. (IAD) are operated by TAP Air Portugal and United Airlines. TAP Air Portugal offers around 22 weekly flights with a typical median fare of approximately $1,269, while United operates about 14 weekly flights with a median fare around $791.",
        "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.",
        "relevant": true,
        "toolsUsed": [
          "route_airlines"
        ]
      },
      "q8": {
        "question": "If I need a connection, what are common layover cities between Lisbon and Washington D.C.?",
        "answer": "Common layover cities between Lisbon and Washington D.C. are London, Madrid, Dublin, and Boston. London and Madrid offer extensive transatlantic networks and efficient connections. Dublin provides U.S. preclearance, saving time on arrival. Boston serves as a convenient domestic hub for onward flights to Washington D.C., often with competitive total travel times."
      },
      "q9": {
        "question": "How reliable are on‑time departures on this route from Lisbon to Washington D.C.?",
        "answer": "On-time performance is generally reliable, though afternoon and evening flights can experience delays due to air traffic or weather. For better odds, choose early morning departures. TAP Air Portugal and United often maintain solid schedules, but always check real-time updates."
      },
      "q10": {
        "question": "Which months have the best weather for traveling to Washington D.C.?",
        "answer": "April to early June and September to October offer pleasant spring and fall temperatures, cherry blossoms or colorful foliage, and smaller crowds than summer."
      },
      "q11": {
        "question": "What documents should I bring with me to the airport when flying from Lisbon to Washington D.C.?",
        "answer": "Bring a passport valid for the duration of your stay, a U.S. visa or ESTA authorization, proof of onward or return travel, a payment method for baggage fees, and any required vaccination certificates or health documents."
      },
      "q12": {
        "question": "Which airport should I use in Washington D.C.?",
        "answer": "Dulles International is the primary international gateway and is about 26 miles west of downtown. Reagan National is much closer to the city centre and handles mostly domestic flights. Baltimore/Washington International is farther out and serves as a low‑cost and Southwest hub."
      },
      "q13": {
        "question": "How do I get to Humberto Delgado Airport from the city center?",
        "answer": "From central Lisbon to Humberto Delgado Airport, the metro red line takes about 20–25 minutes and is the cheapest and most popular option. The Aerobus shuttle serves key city points but costs more and takes 30–40 minutes. Taxis and rideshares are fastest at 15–20 minutes but pricier. Driving and parking are the most expensive."
      },
      "q14": {
        "question": "Are there hotels or sleeping facilities at Washington D.C. airport?",
        "answer": "Washington Dulles International Airport does not have hotels or sleeping pods inside the terminals. However, several nearby hotels are connected by free shuttle, including the Washington Dulles Airport Marriott and the Hyatt Regency Dulles. Shuttle pick-up is available from the Ground Transportation area."
      },
      "q15": {
        "question": "Are there currency exchange offices, prayer rooms and Wi‑Fi at Washington Intl Airport?",
        "answer": "Washington Dulles International Airport offers currency exchange through ICE desks at the International Arrivals Building and in Concourses A and B. A non-denominational chapel is located pre-security in the main terminal. Free Wi-Fi is available throughout all terminals."
      },
      "q16": {
        "question": "Are there accessible services or children's facilities at the Lisbon and Washington D.C. airports?",
        "answer": "Lisbon Airport offers accessible restrooms, reserved parking, and wheelchair assistance bookable through your airline at least 48 hours before departure. Washington Dulles provides wheelchair service, TTY phones, and family restrooms; children’s play areas are not dedicated but the airport has nursing rooms. Request assistance in advance via your airline."
      },
      "q17": {
        "question": "What aircraft are typically used on flights from Lisbon to Washington D.C.?",
        "answer": "The nonstop flights from Lisbon to Washington Dulles are typically operated with Airbus A321-200 Neo (TAP Air Portugal), Boeing 777 (United), and Airbus A321-100 (TAP), while common connecting itineraries use Boeing 777-300ER via Toronto, Airbus A340-600 via Frankfurt, and Boeing 787-10 via Newark. Specific aircraft types can vary by day and airline, and Wi-Fi with seatback entertainment is widely available on these long-haul routes.",
        "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 D.C.?",
        "answer": "The nonstop Lisbon–Washington D.C. route is served by TAP Air Portugal and United Airlines, both Star Alliance members, so Star Alliance is the only alliance with nonstop service on this route; other alliances may reach D.C. 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.",
        "toolsUsed": [
          "route_airlines"
        ]
      },
      "q20": {
        "question": "What are the best airport lounge options when departing from Lisbon?",
        "answer": "At Lisbon Airport, the TAP Air Portugal Lounge and the ANA Lounge serve Star Alliance business‑class passengers and elite members with buffet dining and workspaces. The Blue Lounge accepts Priority Pass and day passes, while the CIP Lounge in Terminal 2 offers similar access. Both feature runway views and light refreshments."
      },
      "q21": {
        "question": "What is the baggage allowance on this route from Lisbon to Washington D.C.?",
        "answer": "Baggage allowance on flights from Lisbon to Washington D.C. varies by airline and fare class. Basic economy tickets are typically restrictive and may not include a checked bag. Standard international economy fares usually include one free checked bag and a carry‑on. Premium cabins offer more generous allowances, often two checked bags."
      },
      "q22": {
        "question": "What cabin and seat options are typical from Lisbon to Washington D.C.?",
        "answer": "On flights from Lisbon to Washington D.C., you can typically choose between Economy, often Premium Economy, 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 cabin tickets typically allow same‑day changes or standby, while Basic Economy usually does not."
      },
      "q24": {
        "question": "What are the cheapest days and times to fly from Lisbon to Washington D.C.?",
        "answer": "The cheapest day to fly from Lisbon to Washington D.C. is Thursday, with an average fare of $978, while Saturday is the most expensive day at $1,201 on average. The cheapest time of day to depart is early morning, with fares starting at $610, whereas late night departures are the most expensive starting at $728.",
        "methodology": "The cheapest day of the week and time of day to depart are drawn from the same large sample of real fares Priceline users found on this route in the last 72 hours, grouped by the day of the week and by the time-of-day window of the outbound departure, with the lowest and average price reported for each.",
        "relevant": true,
        "toolsUsed": [
          "departure_timing"
        ]
      },
      "q25": {
        "question": "What is a good price for a flight from Lisbon to Washington D.C.?",
        "answer": "A great deal for a flight from Lisbon to Washington D.C. is anything under $741, while the typical price is around $1,015. The lowest price found recently is $610, and most fares fall between $600 and $1,200.",
        "methodology": "The typical price, the lowest fare, a 'great deal' threshold, and how fares are spread across price bands are summarized from a large sample of the real fares Priceline users found on this route in the last 72 hours, with a small fraction of extreme outlier fares excluded from the range.",
        "relevant": true,
        "toolsUsed": [
          "price_context"
        ]
      }
    }
  }
}