{ "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": "A nonstop flight from Chicago (ORD) to Lisbon (LIS) takes about 7 hours 30 minutes to 8 hours. With one stop, depending on the connection city, total travel time often ranges from 10 to 12 hours. The return flight is typically slightly shorter, around 7 hours 15 minutes nonstop." }, "q1": { "question": "Are there any direct flights from Chicago to Lisbon?", "answer": "Yes, TAP Air Portugal flies nonstop from Chicago O'Hare (ORD) to Lisbon (LIS) — it's the only carrier on the route. The service runs five days a week (Wednesday through Sunday) with 12 weekly flights, typically departing in the early evening between 6:00 PM and 8:15 PM.", "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 Chicago to Lisbon?", "answer": "Yes — for a flight from Chicago to Lisbon, visa requirements depend on your nationality. As of 2025, U.S. citizens can enter Portugal and the Schengen Area visa-free for up to 90 days within a 180-day period for tourism or business. However, starting May 2025, U.S. travelers will need an ETIAS authorization before travel. Portuguese citizens and other Schengen nationals do not need a visa. For the return from Lisbon to Chicago, Portuguese citizens can travel visa-free under the U.S. Visa Waiver Program but must have a valid ESTA authorization. Other nationalities should check both U.S. and Schengen entry rules." }, "q3": { "question": "What are the ground transportation options in Lisbon?", "answer": "Lisbon Airport (LIS) offers several ground transport options to the city center 7 km away: taxis are available at ranks with metered fares plus an airport surcharge; the Aerobus shuttle (Lines 1 and 2) provides direct service every 20–25 minutes, taking 25–40 minutes for about €4; public buses (routes 5, 22, 44, 45, 83) are the cheapest option; and ride‑share services like Uber operate in Lisbon. There is no direct train from the airport, but nearby metro‑connected stations (e.g. Gare do Oriente) are a short taxi ride away. The Aerobus is the most popular choice for its balance of speed, cost, and direct access to the historical center.", "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, November, and April, with average fares around $734–$757, while June and July are the most expensive, averaging $1,083–$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 Chicago to Lisbon, the best fares are typically found when booking 9–11 weeks ahead, with an average price around $820. The lowest single fare observed was $814 at 75 days before departure. For peak summer travel (June–August) and holiday periods, demand pushes prices higher, so booking at the early end of that window — roughly 11 weeks out — is advisable to 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. They run four times a week — on Wednesdays, Fridays, and Sundays — departing around 8:10–8:15 PM and arriving 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 operates the only nonstop flights from Chicago to Lisbon, with 12 weekly departures out of O'Hare on Wednesday through Sunday. Specific per‑carrier fares aren't provided, but other carriers offer connecting itineraries via their European hubs.", "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 layovers include Dublin, Lisbon's TAP hub, Madrid, and Barcelona, which offer broad connections and efficient transfers, often with visa-free transit for many passengers." }, "q9": { "question": "How reliable are on‑time departures on this route from Chicago to Lisbon?", "answer": "On‑time reliability is generally good, though afternoon storms at O'Hare can cause delays. Morning departures, particularly on TAP Air Portugal, offer your best chance for punctuality." }, "q10": { "question": "Which months have the best weather for traveling to Lisbon?", "answer": "May to June and September to early October offer pleasant temperatures, sunshine, and fewer tourists than peak summer." }, "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 planned stay, proof of onward or return travel, and a payment method for baggage; U.S. citizens do not need a visa for stays under 90 days, but check for any health document requirements." }, "q12": { "question": "Which airport should I use in Lisbon?", "answer": "Lisbon has only one commercial airport, Humberto Delgado Airport, located about 7 km from downtown, with easy metro and bus access." }, "q13": { "question": "How do I get to Dupage County from the city center?", "answer": "DuPage Airport is a general aviation airport with no scheduled commercial passenger service, so typical public transit like the CTA or Metra does not directly serve it. Getting there from downtown Chicago usually means driving or taking a taxi/ride‑share, which takes about 45–60 minutes via I‑290 or I‑88, with parking available on‑site. There are no dedicated shuttle buses from the city center, though a car service or rental car is the most practical option.", "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/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/DuPage%20Airport", "title": "DuPage Airport", "time_published": "2026-03-13T22:38:40Z" }, { "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" } ] }, "q16": { "question": "Are there accessible services or children's facilities at the Chicago and Lisbon airports?", "answer": "Both Chicago O'Hare and Lisbon airports offer accessible services including wheelchair assistance and accessible restrooms, which should be requested through your airline at least 48 hours before departure. At O'Hare, a children's play area is located in Terminal 2, while Lisbon Airport features a kids' zone near the food court and a dedicated 'MyWay' assistance program for travelers with reduced mobility. Family restrooms and priority boarding for families with young children are available at both airports.", "toolsUsed": [], "references": [ { "url": "https://en.wikipedia.org/wiki/DuPage%20Airport", "title": "DuPage Airport", "time_published": "2026-03-13T22:38:40Z" }, { "url": "https://en.wikipedia.org/wiki/Chicago%20Executive%20Airport", "title": "Chicago Executive Airport", "time_published": "2026-03-26T11:15:20Z" }, { "url": "https://en.wikipedia.org/wiki/Chicago_Executive_Airport", "title": "Chicago Executive Airport", "favicon": "https://en.wikipedia.org/static/apple-touch/wikipedia.png", "time_published": "2026-07-16T20:23:03Z" }, { "url": "https://en.wikipedia.org/wiki/Gary/Chicago_Airport_station", "title": "Gary/Chicago Airport station", "time_published": "2026-07-05T23:27:56Z" }, { "url": "https://en.wikipedia.org/wiki/Gary%2FChicago%20Airport%20station", "title": "Gary/Chicago Airport station", "time_published": "2026-04-10T04:17:48Z" }, { "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_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://www.lisbon-airport.net/", "title": "Lisbon Airport (LIS)" }, { "url": "https://lisbonairport.net", "title": "Lisbon Airport | Guide to Lisbon Airport (LIS)" }, { "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": "The only nonstop aircraft on Chicago–Lisbon is the Airbus A330-200, operated by TAP Air Portugal. When connecting, the most common long-haul aircraft are the Boeing 787-9 (via London Heathrow or Philadelphia), the Boeing 777 (via London Heathrow), and the Boeing 787-10 (via London Heathrow), with the Airbus A350-900 also appearing via Paris and Istanbul. The exact aircraft can vary by day and airline, and on many of these aircraft Wi‑Fi and seatback entertainment are widely available.", "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": "The only airline flying nonstop from Chicago (ORD) to Lisbon is TAP Air Portugal, which is a Star Alliance member. Other alliances may serve the route via connections, but Star Alliance is the sole alliance with a direct presence.", "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" ] }, "q21": { "question": "What is the baggage allowance on this route from Chicago to Lisbon?", "answer": "Baggage allowance on Chicago–Lisbon flights depends on the airline and fare type. Basic economy is restrictive, often excluding checked bags. Standard international economy typically includes one free checked bag and a carry‑on." }, "q22": { "question": "What cabin and seat options are typical from Chicago to Lisbon?", "answer": "Chicago to Lisbon flights typically offer Economy and flat‑bed Business class. Premium Economy is available on some carriers; First class is rare." }, "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 often allow same‑day changes or standby, while Basic Economy typically does not." } } } }