{"response": {"Key": "CHI-LIS", "orig": {"code": "CHI", "type": "airport", "city": "Chicago", "fullCity": "Chicago, Illinois", "airport": "Dupage County"}, "dest": {"code": "LIS", "type": "airport", "city": "Lisbon", "fullCity": "Lisbon, Portugal", "airport": "Humberto Delgado Airport"}, "faq": {"q0": {"question": "What is the typical flight duration from Chicago to Lisbon?", "answer": "The flight from Chicago to Lisbon is about 4,000 miles, with a typical nonstop duration of 8 hours and 10 minutes. The return leg is longer, around 9 hours and 20 minutes due to prevailing winds. TAP Air Portugal operates nonstop service from O'Hare on five days a week.", "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"]}, "q1": {"question": "Are there any direct flights from Chicago to Lisbon?", "answer": "TAP Air Portugal flies nonstop from Chicago O'Hare (ORD) to Lisbon (LIS) five days a week — Wednesday through Sunday — with up to 12 weekly departures, mostly in the early evening. The flight covers roughly 4,000 miles and takes about 8 hours 10 minutes eastbound.", "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, 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": ["route_airlines", "flight_schedule"]}, "q3": {"question": "What are the ground transportation options in Lisbon?", "answer": "From Lisbon Airport (LIS), the fastest and most-used option to the city center is the Aerobus shuttle (Lines 1 and 2), which runs every 20–25 minutes and takes 20–40 minutes for €4 (adult 24-hour pass). Public buses (numbers 5, 22, 44, 45, 83) are cheaper but slower, while taxis are available at arrivals with a standard airport surcharge. There is no direct train, but nearby metro stations like Gare do Oriente can be reached by taxi for onward metro connections. Ride-share services like Uber and Bolt also operate, and car rentals are available at the airport, though driving and parking in the city center can be challenging.", "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 Chicago to Lisbon?", "answer": "The cheapest months to fly from Chicago to Lisbon are October, April, and November, with average fares around $736–$760. The most expensive months are June, July, and May, where average prices climb to $1,036–$1,210.", "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 Chicago to Lisbon?", "answer": "For flights from Chicago to Lisbon, the best fares are typically found when booking 9 to 12 weeks ahead, with an average price around $825 in that window. The absolute lowest fare observed was $819 at about 75 days out, while booking much earlier or later tends to push prices above $850. During peak summer months and holiday periods, demand often tightens availability, so aiming for the earlier end of that window or even a few weeks further out can help secure a better deal.", "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 Chicago to Lisbon?", "answer": "Yes, TAP Air Portugal operates nonstop red‑eye flights from Chicago O'Hare (ORD) to Lisbon (LIS) four times a week — on Wednesdays, Fridays, and Sundays — with departures around 8:10–8:15 PM. These are overnight services that arrive 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 Chicago to Lisbon?", "answer": "TAP Air Portugal flies nonstop from Chicago O'Hare to Lisbon, with about 12 weekly flights on Wednesdays, Thursdays, Fridays, Saturdays, and Sundays. Departures are typically in the evening, between 6:00 PM and 8:15 PM. Other carriers may also serve the route with connections, but TAP is the only nonstop 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.", "toolsUsed": ["route_airlines"]}, "q8": {"question": "If I need a connection, what are common layover cities between Chicago and Lisbon?", "answer": "Common layover cities include Lisbon-bound flights often connect through European hubs like Madrid, Barcelona, London, and Paris. These offer broad connections and efficient transfers, with Madrid and Barcelona being particularly well-positioned for onward flights to Lisbon."}, "q10": {"question": "Which months have the best weather for traveling to Lisbon?", "answer": "May, June, and September offer sunny, mild weather and fewer visitors than the peak summer months."}, "q11": {"question": "What documents should I bring with me to the airport when flying from Chicago to Lisbon?", "answer": "Bring a passport valid for at least three months beyond your stay, and if a U.S. citizen, no visa is needed for up to 90 days; have proof of onward or return travel, a payment method for baggage, and any required vaccination certificates."}, "q12": {"question": "Which airport should I use in Lisbon?", "answer": "Lisbon has only one airport, Humberto Delgado Airport, which serves all flights to the city and is conveniently located about seven kilometres from the downtown and main attractions."}, "q13": {"question": "How do I get to Dupage County from the city center?", "answer": "To reach Chicago O'Hare from downtown, the CTA Blue Line 'L' train is the fastest and most popular public option, running directly into the airport. Metra commuter rail and Pace buses also serve O'Hare from the suburbs. Taxis, limos, and rideshare like Uber or Lyft offer door-to-door convenience at a higher cost, while driving yourself is possible with hourly, daily, and economy parking available on-site.", "toolsUsed": [], "references": [{"url": "https://flychicago.com/ohare/tofrom/pages/default.aspx", "title": "Getting To and From O'Hare International Airport | Chicago O’Hare International Airport (ORD)", "favicon": "https://flychicago.com/_catalogs/masterpage/favicon.ico"}, {"url": "https://www.flychicago.com/ohare/map", "title": "Map | Chicago O’Hare International Airport (ORD)", "time_published": "2026-05-27T00:00:00Z"}, {"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://faa.gov/regulations_policies/orders_notices/index.cfm/go/document.information/documentID/6111", "title": "Order  3330.39 - Chicago/o'hare Airport Traffic Control Tower (ATCT) Staffing PChicago/o'hare Airport Traffic Control Tower (ATCT) Staffing Plan (Cancelled)", "time_published": "2026-04-10T00:00:00Z"}]}, "q14": {"question": "Are there hotels or sleeping facilities at Lisbon airport?", "answer": "Lisbon Portela Airport does not have an on-site hotel, capsule hotel, or sleeping pods inside the terminals, but several nearby hotels are connected by shuttle. The Meliá Lisboa Aeroporto is directly across from Terminal 1, accessible on foot, while the TRYP Lisboa Aeroporto Hotel is a short shuttle ride away. Both offer convenient options for a proper rest without leaving the airport area.", "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"}]}, "q17": {"question": "What aircraft are typically used on flights from Chicago to Lisbon?", "answer": "There is no nonstop service from Chicago to Lisbon. The most common aircraft on the long leg of one-stop itineraries are the Boeing 787-9 (via Philadelphia on American, or via London on British Airways/American) and the Boeing 777 (via London on British Airways), with the Airbus A330-300 also appearing via Madrid on Iberia. The exact aircraft varies by airline and connection point, and shorter connecting legs are typically operated by narrow-body jets like the Airbus A320 family or Boeing 737.", "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 Chicago to Lisbon?", "answer": "TAP Air Portugal, a Star Alliance member, is the only airline flying nonstop from Chicago (ORD) to Lisbon. Other alliances may serve the route via connections, but no other carriers operate it nonstop.", "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 Chicago?", "answer": "At Chicago O'Hare (ORD), departing passengers can choose from several airline-branded and independent lounges. United operates five United Clubs (gates B6, B18, C10, E7, and F9) and a Polaris Lounge (gate C18) exclusively for international first and business class passengers. American Airlines has two Admirals Clubs (gates G8 and L2A) and a Flagship Lounge (gate H6/K6) for premium international travelers. In Terminal 5, Delta's Sky Club is near gate M13, and the Air France Lounge (M17) welcomes business class and elite SkyTeam passengers. Independent options include the Swissport Lounge (M18) accepting Priority Pass and day passes, plus the Wingtips Lounge (M19) serving Star Alliance and other premium passengers.", "toolsUsed": [], "references": [{"url": "https://www.flychicago.com/ohare/ServicesAmenities/services/Pages/lounges.aspx", "title": "Airline Lounges | Chicago O’Hare International Airport (ORD)", "time_published": "2026-05-29T00:00:00Z"}, {"url": "https://www.delta.com/us/en/airports/united-states/chicago-sky-club-airport-map", "title": "Chicago O'Hare (ORD) Airport Map & Lounges | Delta Air Lines", "time_published": "2022-11-18T00:00:00Z"}, {"url": "https://my.prioritypass.com/en-GB/lounges/united-states-of-america/ohare-international/ord10-swissport-lounge", "title": "Swissport Lounge ORD AIRPORT Terminal 5 O'Hare International | Priority Pass", "time_published": "2024-11-05T00:00:00Z"}, {"url": "https://americanexpress.com/en-ca/travel/lounges/the-platinum-card/ORD", "title": "American Express Lounges at O'Hare International Airport | Amex CA", "favicon": "https://www.americanexpress.com/apple-touch-icon-152x152.png"}, {"url": "http://www.americanexpress.com/en-us/travel/lounges/the-platinum-card/ORD/Swissport-Lounge-Terminal-5-Concourse-M-5mTKilCqDl/", "title": "Swissport Lounge at O'Hare International Airport | Amex US", "favicon": "https://www.americanexpress.com/apple-touch-icon-152x152.png"}]}, "q21": {"question": "What is the baggage allowance on this route from Chicago to Lisbon?", "answer": "Baggage allowance on flights from Chicago to Lisbon depends on the airline and fare type. Basic Economy tickets are restrictive and may not include a checked bag. Standard international economy fares typically include one free checked bag and a carry‑on, while premium cabins offer more generous allowances."}, "q22": {"question": "What cabin and seat options are typical from Chicago to Lisbon?", "answer": "Flights from Chicago to Lisbon typically offer Economy and flat-bed Business class. Premium Economy is available on select airlines; First class is rare."}, "q23": {"question": "Are same‑day changes or standby possible on this route?", "answer": "Policies vary by airline and fare; flexible and premium tickets typically allow same‑day changes or standby, while Basic Economy generally does not."}}}}