{
  "response": {
    "Key": "DEN-LIS",
    "orig": {
      "code": "DEN",
      "type": "airport",
      "city": "Denver",
      "fullCity": "Denver, Colorado",
      "airport": "Denver Intl Airport"
    },
    "dest": {
      "code": "LIS",
      "type": "airport",
      "city": "Lisbon",
      "fullCity": "Lisbon, Portugal",
      "airport": "Humberto Delgado Airport"
    },
    "faq": {
      "q1": {
        "question": "Are there any direct flights from Denver to Lisbon?",
        "answer": "There are no nonstop flights from Denver to Lisbon. The shortest one-stop routings typically connect through East Coast hubs like Newark (EWR) or Boston (BOS), with total travel time around 12–13 hours including a layover. United via Newark and TAP Air Portugal via Boston are common options, with fares starting around $711.",
        "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. Cheapest prices are determined by finding the lowest fare Priceline users have found for the requested route and date in the last 72 hours.",
        "toolsUsed": [
          "route_airlines",
          "flight_schedule",
          "cheapest_flights"
        ]
      },
      "q3": {
        "question": "What are the ground transportation options in Lisbon?",
        "answer": "From Lisbon Airport, the most used option is the metro; the red line reaches the city center in about 20 minutes and a single ticket costs around €1.50. The Aerobus shuttle (Lines 1 and 2) runs every 20–25 minutes to the historical center, with a 24‑hour pass at €4. Taxis are available at ranks outside arrivals, with a 10–15 minute trip to downtown typically costing €10–15 plus luggage surcharges. Ride‑share services like Uber and Bolt also operate from designated pickup areas, often slightly cheaper than taxis. Car rental desks are in the terminal, but driving in central Lisbon is not recommended due to narrow streets and limited parking.",
        "toolsUsed": [
          "article_lookup"
        ],
        "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)"
          }
        ],
        "methodology": "Airport details are drawn from the sources listed with this answer, primarily the airport operator's official website along with airline, lounge-operator and transit-authority pages, collected by our research process and refreshed periodically. Only information found in those sources is used; where a source does not cover a topic it is left out rather than guessed."
      },
      "q4": {
        "question": "When is the cheapest time to fly from Denver to Lisbon?",
        "answer": "Average fares from Denver to Lisbon bottom out around $437 in late January, with the cheapest months overall being September ($445), January ($452), and October ($454). The most expensive stretch is late December, when average fares climb to about $589, and December ($558), June ($538), and July ($528) are the priciest months overall.",
        "methodology": "Seasonal fares come from Priceline's own air booking-summary archive, analysed in-house and refreshed monthly. For each day of the year we take a representative round-trip fare, a blend of the 25th-percentile and average ticket price over the route's bookings, and smooth the series into a seasonal curve; the half-month low and high and the monthly figures quoted here are averages of that curve. Thin and international routes borrow their seasonal shape from the nearest busy routes, with the price level anchored to the route's own bookings.",
        "toolsUsed": [
          "seasonal_prices"
        ]
      },
      "q5": {
        "question": "How far in advance should I book tickets from Denver to Lisbon?",
        "answer": "For Denver to Lisbon, the sweet spot is booking about 4–6 weeks ahead, when fares average around $365 and dip to a low of $363 at 30 days out. Booking very early (6 months ahead) is the most expensive, around $562, and prices climb steadily again if you wait until the last two weeks. Summer and holiday periods shift this earlier — aim for 2–3 months ahead for peak-season travel to avoid the steepest markups.",
        "methodology": "Booking-window guidance comes from the same monthly in-house analysis of Priceline's own air booking-summary archive. We aggregate the route's bookings by how many days before departure they were made, from about 180 days out to the day of travel, smooth the curve, and highlight the stretch of lead times with the lowest average fare. Thin and international routes borrow the curve shape from the nearest busy routes, anchored to the route's own price level. It reflects current fares and is refreshed monthly.",
        "toolsUsed": [
          "booking_timing"
        ]
      },
      "q6": {
        "question": "Are overnight (red‑eye) flights available from Denver to Lisbon?",
        "answer": "There are no nonstop red-eye flights from Denver to Lisbon, but several one-stop overnight itineraries are available where the long leg is a red-eye. For example, you can connect via Newark (UA, departing 8:25 PM and arriving 8:20 AM), via Montreal (AC, 9:45 PM departure, 9:20 AM arrival), via London Heathrow (BA, 6:40 PM departure, 10:35 AM arrival), via Philadelphia (AA, 9:05 PM departure, 9:05 AM arrival), or via Washington Dulles (UA, 10:25 PM departure, 10:30 AM arrival), among others — all arrivals are in the morning hours.",
        "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 Denver to Lisbon?",
        "answer": "There is no nonstop service between Denver and Lisbon. Common one-stop routings include United via Newark or Washington Dulles, Air Canada via Montreal or Toronto, American via Philadelphia, British Airways via London Heathrow, Lufthansa via Munich or Frankfurt, Delta via Boston, and TAP Air Portugal via Boston or New York JFK. United via Newark and Air Canada via Montreal each show about six daily connection options, with United via Dulles and American via Philadelphia around five daily, while other patterns appear less frequently. Per-carrier median fares are not provided for this route, so specific fare estimates are unavailable.",
        "methodology": "Airlines and weekly frequencies come 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 typical fare is shown for a carrier, it is the median of 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 Denver and Lisbon?",
        "answer": "Common layover cities between Denver and Lisbon include Newark, Amsterdam, Paris, and Frankfurt. Newark offers a domestic first leg with a single transatlantic hop and efficient U.S. connections. Amsterdam and Paris provide smooth transfers within a single terminal or airside, and Frankfurt is a major Star Alliance hub with extensive onward links. All three European hubs allow visa‑free transit for U.S. citizens, keeping total travel time competitive."
      },
      "q10": {
        "question": "Which months have the best weather for traveling to Lisbon?",
        "answer": "April to June and September to October offer mild, sunny weather with fewer tourists than the summer peak."
      },
      "q11": {
        "question": "What documents should I bring with me to the airport when flying from Denver to Lisbon?",
        "answer": "Bring a passport valid for at least three months beyond your planned stay, and if you're a U.S. citizen, no visa is needed for stays under 90 days. Carry 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 commercial airport, Humberto Delgado Airport, located about 7 km from the city centre. It serves all flights to the city."
      },
      "q13": {
        "question": "How do I get to Denver Intl Airport from the city center?",
        "answer": "The A Line commuter rail (RTD) runs from Denver Union Station downtown to the airport transit center in about 37 minutes, offering the fastest and most popular public transit option. Ride‑share services like Uber and Lyft, as well as taxis, provide door‑to‑door convenience with a typical drive of 35–50 minutes depending on traffic. Several shuttle and shared‑van services also operate, and driving yourself is possible with extensive on‑airport parking, though parking fees can add up for longer trips.",
        "toolsUsed": [
          "article_lookup"
        ],
        "references": [
          {
            "url": "https://www.flydenver.com/parking-and-transportation/to-and-from/airport-transit-center/",
            "title": "Airport Transit Center | Denver International Airport",
            "time_published": "2026-02-24T17:09:34Z"
          },
          {
            "url": "https://flydenver.com/connections/",
            "title": "Connections | Denver International Airport",
            "favicon": "https://flydenver.com/apple-touch-icon.png",
            "time_published": "2023-09-14T15:33:21Z"
          },
          {
            "url": "https://en.wikipedia.org/wiki/Automated_Guideway_Transit_System_(Denver_International_Airport)",
            "title": "Automated Guideway Transit System (Denver International Airport)",
            "time_published": "2026-06-01T08:54:40Z"
          },
          {
            "url": "https://en.wikipedia.org/wiki/Denver%20International%20Airport",
            "title": "Denver International Airport",
            "time_published": "2026-04-30T15:08:23Z"
          },
          {
            "url": "https://www.faa.gov/?action=searchForAirport&airportcode=PSR",
            "title": "Federal Aviation Administration",
            "favicon": "https://www.faa.gov/themes/custom/faa/favicon.png",
            "time_published": "2026-07-17T12:00:00Z"
          }
        ],
        "methodology": "Airport details are drawn from the sources listed with this answer, primarily the airport operator's official website along with airline, lounge-operator and transit-authority pages, collected by our research process and refreshed periodically. Only information found in those sources is used; where a source does not cover a topic it is left out rather than guessed."
      },
      "q14": {
        "question": "Are there hotels or sleeping facilities at Lisbon airport?",
        "answer": "Lisbon Airport (LIS) does not have any on-site hotels, capsule hotels, or sleeping pods inside the terminals. Several nearby hotels, such as the Meliá Lisboa Aeroporto and Tryp Lisboa Aeroporto Hotel, are located within walking distance or offer shuttle services. The airport also has a free shuttle bus connecting Terminal 1 and Terminal 2, but it does not serve hotels.",
        "toolsUsed": [
          "article_lookup"
        ],
        "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"
          }
        ],
        "methodology": "Airport details are drawn from the sources listed with this answer, primarily the airport operator's official website along with airline, lounge-operator and transit-authority pages, collected by our research process and refreshed periodically. Only information found in those sources is used; where a source does not cover a topic it is left out rather than guessed."
      },
      "q17": {
        "question": "What aircraft are typically used on flights from Denver to Lisbon?",
        "answer": "There is no nonstop service between Denver and Lisbon. On connecting itineraries the long-haul leg is most often operated by a Boeing 777-300ER (via Toronto), a Boeing 787-10 (via Newark), or an Airbus A350-1000 (via London Heathrow); other widebody types such as the Boeing 787-9, Boeing 777, Airbus A350-900, and Airbus A380-800 also appear on this route. The exact aircraft varies by airline and day, but the Boeing 777 and 787 families along with the Airbus A350 are the most common widebodies. Wi‑Fi and seatback entertainment are widely available on these long‑haul aircraft, though the specific amenities depend on the carrier.",
        "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"
        ]
      },
      "q20": {
        "question": "What are the best airport lounge options when departing from Denver?",
        "answer": "Denver International Airport has two main lounge options: the Centurion Lounge in Concourse C and the Delta Sky Club in the Main Terminal, Concourse A. The Centurion Lounge offers complimentary premium food, cocktails, and Wi-Fi, with access for American Express Platinum and Centurion cardholders. The Delta Sky Club provides a relaxing space with flight monitors, beer and wine, and printers, accessible to Delta One or SkyTeam business-class passengers, elite members, and certain credit card holders. Both lounges are well-regarded, but note that DEN does not have dedicated United Club or American Admirals Club lounges.",
        "toolsUsed": [
          "article_lookup"
        ],
        "references": [
          {
            "url": "https://americanexpress.com/en-gb/travel/lounges/the-platinum-card/DEN",
            "title": "American Express Lounges at Denver International Airport | Amex GB",
            "time_published": "2026-05-03T00:00:00Z"
          },
          {
            "url": "https://www.flydenver.com/",
            "title": "Denver International Airport | DEN",
            "favicon": "https://www.flydenver.com/apple-touch-icon.png",
            "time_published": "2026-06-02T21:34:27Z"
          },
          {
            "url": "https://flydenver.com/at-the-airport",
            "title": "Exciting Things to Do at Denver International Airport",
            "time_published": "2026-02-18T15:39:31Z"
          },
          {
            "url": "https://www.americanexpress.com/en-us/travel/lounges/the-centurion-card-idc-en/DEN/Delta-Sky-Club-Main-Terminal-Concourse-A-IgRTEiZDls/",
            "title": "Delta Sky Club at Denver International Airport | Amex US",
            "time_published": "2026-03-18T00:00:00Z"
          },
          {
            "url": "https://carsandstays.delta.com/Denver-Hotels-Sleep-Inn-Suites-Denver-International-Airport.h23533743.Hotel-Information?categorySearch=any_option&chkin=2026-07-06&chkout=2026-07-07&destType=MARKET&destination=Denver%2C+CO%2C+United+States+of+America+%28DEN-All+Airports%29&latLong=39.74483000000001%2C-104.94829500000002&pwa_ts=1782175590171&referrerUrl=aHR0cHM6Ly9jYXJzYW5kc3RheXMuZGVsdGEuY29tL0hvdGVsLVNlYXJjaA%3D%3D&regionId=6139084&rfrr=HSR&rm1=a2&searchId=b9103c12-38ab-46f5-86a7-f3447411bdbe&selectedRatePlan=383244565&selectedRoomType=218717901&sort=RECOMMENDED&top_cur=USD&top_dp=126&useRewards=false&x_pwa=1",
            "title": "Sleep Inn & Suites Denver International Airport",
            "favicon": "https://carsandstays.delta.com/favicon.ico",
            "time_published": "2026-06-23T09:32:24Z"
          }
        ],
        "methodology": "Airport details are drawn from the sources listed with this answer, primarily the airport operator's official website along with airline, lounge-operator and transit-authority pages, collected by our research process and refreshed periodically. Only information found in those sources is used; where a source does not cover a topic it is left out rather than guessed."
      },
      "q21": {
        "question": "What is the baggage allowance on this route from Denver to Lisbon?",
        "answer": "Baggage rules differ by airline and fare class. Basic economy often excludes checked luggage, while standard international economy typically includes one checked bag and a carry‑on. Premium cabins provide higher allowances."
      },
      "q22": {
        "question": "What cabin and seat options are typical from Denver to Lisbon?",
        "answer": "Flights from Denver to Lisbon typically offer Economy and flat-bed Business class, with Premium Economy available on select connecting itineraries."
      },
      "q23": {
        "question": "Are same‑day changes or standby possible on this route?",
        "answer": "Policies vary by airline and fare; flexible and premium cabins often allow same‑day changes or standby, while Basic Economy typically does not."
      }
    }
  }
}