{ "response": { "Key": "LIS-CHI", "orig": { "code": "LIS", "type": "airport", "city": "Lisbon", "fullCity": "Lisbon, Portugal", "airport": "Humberto Delgado Airport" }, "dest": { "code": "CHI", "type": "airport", "city": "Chicago", "fullCity": "Chicago, Illinois", "airport": "Dupage County" }, "faq": { "q0": { "question": "What is the typical flight duration from Lisbon to Chicago?", "answer": "A direct flight from Lisbon to Chicago typically takes around 9 hours 30 minutes. Flights with one stop, often in cities like Madrid or London, extend total travel time to 12 to 14 hours. The return from Chicago to Lisbon is usually shorter, around 8 hours 15 minutes nonstop, due to prevailing tailwinds." }, "q1": { "question": "Are there any direct flights from Lisbon to Chicago?", "answer": "Yes, TAP Air Portugal flies nonstop from Lisbon to Chicago O'Hare (ORD) with 11 weekly flights, operating Wednesday through Sunday. There are multiple daily departures on those days, typically clustered between late morning and early afternoon. No other airline offers nonstop service on this route.", "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 Chicago?", "answer": "Yes, there are visa requirements for traveling from Lisbon to Chicago. If you are a U.S. citizen, you do not need a visa to enter the U.S., but ensure your passport is valid. If you are a Portuguese citizen, you can travel to the U.S. under the Visa Waiver Program for stays of 90 days or less, but you must obtain an approved ESTA authorization before departure. For other nationalities, a visa may be required. When traveling from Chicago to Lisbon, U.S. citizens can enter Portugal and the Schengen Area for up to 90 days without a visa. Starting in 2025, U.S. citizens will need an ETIAS authorization for the Schengen Area, but exact date is not yet set. Portuguese citizens returning to Portugal do not need a visa." }, "q4": { "question": "When is the cheapest time to fly from Lisbon to Chicago?", "answer": "The cheapest months to fly from Lisbon to Chicago are October, November, and April, with average fares around $734, $754, and $757 respectively. The most expensive months are June, July, and May, where average prices climb to $1,210, $1,083, and $1,036.", "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 Chicago?", "answer": "For flights from Lisbon to Chicago, the best fares are typically found when booking 9 to 11 weeks before departure, with an average price around $820. The cheapest single booking window is about 75 days out, at $814, while prices rise noticeably if you book more than 15 weeks ahead or within a few weeks of travel. For summer or holiday periods, demand usually pushes optimal booking slightly earlier—aim for 12 to 15 weeks out to avoid the steepest premiums.", "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 Chicago?", "answer": "No overnight (red‑eye) flights operate from Lisbon to Chicago — neither nonstop nor connecting itineraries with a red‑eye long leg are available 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 Chicago?", "answer": "TAP Air Portugal operates nonstop flights from Lisbon to Chicago O'Hare, with 11 weekly departures on Wednesdays, Thursdays, Fridays, Saturdays, and Sundays. Multiple departure times are available throughout the day, typically between late morning and early afternoon. No per‑carrier fare data is provided for this route.", "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 Chicago?", "answer": "Common layover hubs include Madrid, London, Dublin and Toronto. Madrid offers extensive Iberia connections and a single-terminal transfer. London and Dublin allow efficient one-stop itineraries, with Dublin providing US preclearance so you arrive as a domestic passenger. Toronto is a major North American gateway with smooth connections on Air Canada and United, and eligible travelers can transit visa-free via the eTA program." }, "q9": { "question": "How reliable are on‑time departures on this route from Lisbon to Chicago?", "answer": "On‑time performance is generally good, though afternoon and evening flights face greater risk of delays. Early departures, particularly on TAP Air Portugal, tend to be more reliable." }, "q10": { "question": "Which months have the best weather for traveling to Chicago?", "answer": "May to June and September to October offer pleasant temperatures and fewer tourists." }, "q11": { "question": "What documents should I bring with me to the airport when flying from Lisbon to Chicago?", "answer": "Bring a passport valid for at least six months beyond your stay, an ESTA authorization or valid U.S. visa, proof of onward or return travel, a payment method for baggage, and any required vaccination or health documents." }, "q12": { "question": "Which airport should I use in Chicago?", "answer": "O'Hare is the primary international gateway, a major hub for United and American, and handles most long‑haul flights. Midway is closer to downtown and focuses on domestic low‑cost and Southwest services." }, "q13": { "question": "How do I get to Humberto Delgado Airport from the city center?", "answer": "From downtown Lisbon, you can reach Humberto Delgado Airport by Metro (Red Line, about 20 minutes from the city center), the Aerobus shuttle (Lines 1 and 2, running every 20–25 minutes), local buses (numbers 5, 22, 44, 45, 83), taxi, or ride‑share. The Metro is generally the fastest and most popular option, while Aerobus provides a direct, comfortable ride with luggage space; taxis and ride‑shares offer door‑to‑door convenience but are more expensive. Driving is possible with on‑site parking, though traffic can be heavy.", "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)" } ] }, "q15": { "question": "Are there currency exchange offices, prayer rooms and Wi‑Fi at Dupage County?", "answer": "DuPage Airport (DPA) is a general aviation airport and does not offer currency exchange offices or prayer rooms/chapels. Free Wi‑Fi is available throughout the terminal building, including in the pilot lounges and public waiting areas.", "toolsUsed": [], "references": [ { "url": "https://en.wikipedia.org/wiki/DuPage_Airport", "title": "DuPage Airport", "favicon": "https://en.wikipedia.org/static/apple-touch/wikipedia.png", "time_published": "2026-07-16T20:45:00Z" }, { "url": "https://en.wikipedia.org/wiki/DuPage%20Airport", "title": "DuPage Airport", "time_published": "2026-03-13T22:38:40Z" }, { "url": "https://en.wikipedia.org/wiki/Transportation_in_Chicago", "title": "Transportation in Chicago", "favicon": "https://en.wikipedia.org/static/apple-touch/wikipedia.png", "time_published": "2026-05-15T02:56:07Z" }, { "url": "https://en.wikipedia.org/wiki/Transportation%20in%20Chicago", "title": "Transportation in Chicago", "time_published": "2026-04-13T06:59:09Z" }, { "url": "https://en.wikipedia.org/wiki/Chicago%20Executive%20Airport", "title": "Chicago Executive Airport", "time_published": "2026-03-26T11:15:20Z" } ] }, "q17": { "question": "What aircraft are typically used on flights from Lisbon to Chicago?", "answer": "There is no nonstop service from Lisbon to Chicago. On typical one-stop itineraries, the long transatlantic leg is most often operated by Boeing 787-10s (via Newark, Frankfurt, or London), Boeing 777-300ERs (via Toronto), or Airbus A330-300s (via Montreal or Madrid), while the shorter connecting leg uses narrow-body aircraft like the Airbus A320 family, Boeing 737, or Embraer 175. The exact aircraft can vary by day and airline, and Wi‑Fi and seatback entertainment are widely available on these long-haul types.", "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 Chicago?", "answer": "TAP Air Portugal is the only carrier with nonstop service from Lisbon to Chicago (LIS–ORD). TAP is a Star Alliance member, so Star Alliance is the sole alliance on the nonstop route. Other alliances may offer connecting itineraries, but no other airline operates the route directly.", "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 main lounge is the ANA Lounge in Terminal 1, open daily from 4:00 AM to 11:00 PM, located after security and passport control near Gate 22 on Floor 6. It offers complimentary alcoholic drinks (up to three), a smoking room, disabled access, and a business center for a fee. Access is available through Priority Pass, and it serves both Schengen and non-Schengen flights.", "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 Chicago?", "answer": "Baggage rules vary by airline and fare class. Basic economy often excludes checked luggage; standard economy typically includes one checked bag and a personal item plus a carry-on. Premium cabins offer higher allowances." }, "q22": { "question": "What cabin and seat options are typical from Lisbon to Chicago?", "answer": "Flights from Lisbon to Chicago usually feature Economy, Premium Economy, and flat‑bed Business class; First class is not common on this route." }, "q23": { "question": "Are same‑day changes or standby possible on this route?", "answer": "Policies differ by airline and fare; flexible and higher cabins often allow same‑day changes or standby, while basic economy tickets typically do not." } } } }