{
  "response": {
    "Key": "LIS-SFO",
    "orig": {
      "code": "LIS",
      "type": "airport",
      "city": "Lisbon",
      "fullCity": "Lisbon, Portugal",
      "airport": "Humberto Delgado Airport"
    },
    "dest": {
      "code": "SFO",
      "type": "airport",
      "city": "San Francisco",
      "fullCity": "San Francisco, California",
      "airport": "San Francisco Intl Airport"
    },
    "faq": {
      "q0": {
        "question": "What is the typical flight duration from Lisbon to San Francisco?",
        "answer": "A nonstop flight from Lisbon (LIS) to San Francisco (SFO) typically takes 12 to 13 hours westbound. The return eastbound nonstop is faster, usually 10.5 to 11.5 hours due to tailwinds. With one stop, common layovers include Newark, Boston, or London, bringing total travel time to 15–18 hours depending on connection duration. TAP Air Portugal operates the only nonstop service."
      },
      "q1": {
        "question": "Are there any direct flights from Lisbon to San Francisco?",
        "answer": "Yes, TAP Air Portugal (TP) flies nonstop from Lisbon (LIS) to San Francisco (SFO) with 14 weekly flights, operating Monday through Saturday but not on Sundays. Departure times range from 9:00 AM to 1:00 PM local time.",
        "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 San Francisco?",
        "answer": "Yes — visa requirements apply for travel from Lisbon to San Francisco, depending on your citizenship. If you are a Portuguese national, you can travel visa‑free to the United States for stays of up to 90 days under the Visa Waiver Program, but you must obtain an approved ESTA authorization before departure. If you are a U.S. national, you do not need a visa to enter the U.S. If you are a national of another country, check the U.S. State Department website to see if you need a visa or are eligible for ESTA. For the return journey, U.S. citizens do not need a visa for Portugal for stays under 90 days within the Schengen area; from mid‑2025, U.S. travelers will need to obtain an ETIAS authorization before travel."
      },
      "q3": {
        "question": "What are the ground transportation options in San Francisco?",
        "answer": "From San Francisco International Airport (SFO), the BART rapid transit system provides a direct and popular link to downtown San Francisco in about thirty minutes, with stations at key locations like Powell Street and Embarcadero. Taxis and ride-share services such as Uber and Lyft are readily available at designated zones and offer door-to-door convenience, though travel time by car typically ranges from twenty to forty minutes depending on traffic. SamTrans buses also connect SFO to San Francisco and the Peninsula, but are slower and less frequent. Car rentals are available at the airport’s consolidated rental car center, but parking in the city is expensive and limited, making them less practical for city-center visits. Most travelers use BART due to its speed, reliability, and cost-effectiveness compared to driving."
      },
      "q4": {
        "question": "When is the cheapest time to fly from Lisbon to San Francisco?",
        "answer": "The cheapest months to fly from Lisbon to San Francisco are March (around $704), April ($726), and November ($776), while the most expensive are June ($1216), May ($1014), and July ($1008).",
        "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 San Francisco?",
        "answer": "For flights from Lisbon to San Francisco, the optimal booking window is roughly 8 to 11 weeks before departure, with the lowest average fares around $800. The single cheapest day to book appears about 65 days out at $793, while prices tend to rise sharply if you book more than 4 months ahead, reaching $974 at 135 days.",
        "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 San Francisco?",
        "answer": "No overnight (red-eye) flights are available from Lisbon (LIS) to San Francisco (SFO). Neither nonstop red-eyes nor connecting itineraries with a red-eye long leg were 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 San Francisco?",
        "answer": "On the Lisbon (LIS) to San Francisco (SFO) route, TAP Air Portugal (TP) operates non‑stop flights daily except Sunday, with multiple departures per day and a typical median fare around $1,760. Other carriers may offer connecting service, but the schedule data shows only TAP as the non‑stop operator.",
        "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 San Francisco?",
        "answer": "Common layover cities between Lisbon and San Francisco include New York (JFK/EWR), Boston, Philadelphia and Chicago. These hubs offer broad connections across the U.S., efficient transfer processes and competitive total travel times. Eastbound flights typically have shorter durations due to tailwinds."
      },
      "q9": {
        "question": "How reliable are on‑time departures on this route from Lisbon to San Francisco?",
        "answer": "On-time reliability is generally good, though afternoon departures can be affected by cascading delays from earlier rotations. TAP Air Portugal's morning flights tend to depart more punctually than later options."
      },
      "q10": {
        "question": "Which months have the best weather for traveling to San Francisco?",
        "answer": "September and October offer San Francisco's warmest, sunniest weather and fewer tourists than summer."
      },
      "q11": {
        "question": "What documents should I bring with me to the airport when flying from Lisbon to San Francisco?",
        "answer": "Bring a passport valid for the duration of your stay, an approved ESTA or valid U.S. visa, proof of onward or return travel, a payment method for baggage, and any required vaccination certificates. Real ID is irrelevant for international travel."
      },
      "q12": {
        "question": "Which airport should I use in San Francisco?",
        "answer": "San Francisco International is the primary airport, 13 miles south of downtown, served by major carriers and alliances including United and Star Alliance. Oakland is across the bay, closer to East Bay destinations, popular with low-cost airlines like Southwest. San Jose is farther south, convenient for Silicon Valley, but seldom needed for San Francisco itself."
      },
      "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 minutes and is the cheapest and most popular option. Aerobus shuttles and public buses are slightly slower but economical. Rideshares and taxis take 15–20 minutes and cost more. Driving and parking are available but generally the most expensive choice."
      },
      "q14": {
        "question": "Are there hotels or sleeping facilities at San Francisco airport?",
        "answer": "San Francisco International Airport does not have on-site hotels or sleeping pods. The closest option is the Grand Hyatt at SFO, which is connected to the airport by the AirTrain people mover and accessible from all terminals without a shuttle bus. Several other nearby hotels offer free shuttle service."
      },
      "q15": {
        "question": "Are there currency exchange offices, prayer rooms and Wi‑Fi at San Francisco Intl Airport?",
        "answer": "San Francisco International Airport offers currency exchange at Travelex counters in the International Terminal. A meditation/prayer room is located pre‑security in the International Terminal, and there is a Berman Reflection Room in Terminal 1 post‑security. Free Wi‑Fi is available throughout all terminals."
      },
      "q16": {
        "question": "Are there accessible services or children's facilities at the Lisbon and San Francisco airports?",
        "answer": "Lisbon Airport provides free wheelchair assistance and MyWay accessibility services; request help from your airline 48 hours before departure. A children’s play area is in Terminal 1 near the food court. San Francisco International offers wheelchair assistance, visual paging, and the Wag Brigade therapy animals; request assistance in advance via your airline. Kids’ Spots play areas are in Terminals 2 and 3."
      },
      "q17": {
        "question": "What aircraft are typically used on flights from Lisbon to San Francisco?",
        "answer": "Nonstop Lisbon–San Francisco flights typically use the Airbus A330-900 Neo on TAP Air Portugal, while common connecting itineraries feature Boeing 777s (via Frankfurt, Newark, Washington-Dulles, or Zurich), Boeing 787-10s (via Newark or Amsterdam), and Airbus A330-300s (via Montreal or Dublin) on airlines like United, Lufthansa, Air Canada, and KLM; exact aircraft can vary by day and airline. Most of these long-haul jets offer seatback entertainment and Wi-Fi availability.",
        "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 San Francisco?",
        "answer": "Star Alliance serves Lisbon to San Francisco nonstop through TAP Air Portugal, the only carrier shown in the schedule data for this route. No other alliances appear in the nonstop data, though connecting itineraries may involve other alliances.",
        "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 in Terminal 1 is the primary branded lounge, offering a buffet, bar, and showers to business class passengers and Star Alliance Gold members. The ANA Lounge, also in Terminal 1, is accessible via Priority Pass and select credit cards, featuring light snacks and a quiet atmosphere. Both are located in the Schengen area, so passengers on non‑Schengen flights should allow time for passport control after visiting."
      },
      "q21": {
        "question": "What is the baggage allowance on this route from Lisbon to San Francisco?",
        "answer": "Baggage allowance on Lisbon to San Francisco flights depends on the airline and fare type. Basic economy tickets often do not include a checked bag, while standard international economy usually includes one free checked bag and a carry-on. Premium cabins typically allow two checked bags and larger carry-ons. Always check your specific airline's policy."
      },
      "q22": {
        "question": "What cabin and seat options are typical from Lisbon to San Francisco?",
        "answer": "Lisbon to San Francisco flights typically offer Economy and flat-bed Business class, with Premium Economy available on select carriers like TAP Air Portugal."
      },
      "q23": {
        "question": "Are same‑day changes or standby possible on this route?",
        "answer": "Policies depend on the airline and fare class, with flexible and premium cabin tickets generally allowing same‑day changes or standby, while restrictive economy fares typically do not."
      },
      "q24": {
        "question": "What are the cheapest days and times to fly from Lisbon to San Francisco?",
        "answer": "The cheapest day to fly from Lisbon to San Francisco is Thursday, with an average fare around $1,323, while Friday is the most expensive at about $1,550. The cheapest time of day to depart is during the Early Morning window, with fares starting as low as $741, whereas Late Night departures are notably pricier with minimum fares from $875.",
        "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 San Francisco?",
        "answer": "A great deal on a flight from Lisbon to San Francisco is anything under $910, while the typical price is around $1,251.",
        "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"
        ]
      }
    }
  }
}