{
  "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": "Lisbon Airport offers several ground transportation options: taxis, the Metro (Red Line), Carris city buses, shuttles, and rental cars. The Metro's Aeroporto station is at Terminal 1 and takes about 20 minutes to reach downtown, making it a fast and affordable choice. Taxis are available 24/7 and reach the city center in roughly 15 minutes. The Metro is generally the most-used option for its speed and convenience, though taxis are the fastest door-to-door. Car rentals and shuttles are also available for those needing flexibility or service to areas not covered by public transit.",
        "toolsUsed": [
          "article_lookup"
        ],
        "references": [
          {
            "url": "https://en.wikipedia.org/wiki/Lisbon_Airport",
            "title": "Lisbon Airport",
            "favicon": "https://en.wikipedia.org/static/apple-touch/wikipedia.png",
            "time_published": "2026-09-14T10:27:02Z"
          },
          {
            "url": "https://lisbon-lis.airports-guides.com",
            "title": "Lisbon Portela Airport (LIS) Information: LIS Airport in Lisbon Area, Portugal",
            "favicon": "http://www.airports-guides.com/favicon.ico"
          },
          {
            "url": "https://en.wikipedia.org/wiki/Transport_in_Portugal",
            "title": "Transport in Portugal",
            "time_published": "2026-05-04T23:32:13Z"
          },
          {
            "url": "https://en.wikipedia.org/wiki/Lisbon_Metro_Red_Line",
            "title": "Lisbon Metro Red Line",
            "favicon": "https://en.wikipedia.org/static/apple-touch/wikipedia.png",
            "time_published": "2026-05-25T05:54:05Z"
          },
          {
            "url": "https://en.wikipedia.org/wiki/Trams_in_Lisbon",
            "title": "Trams in Lisbon",
            "favicon": "https://en.wikipedia.org/static/apple-touch/wikipedia.png",
            "time_published": "2026-08-15T23:13:49Z"
          }
        ]
      },
      "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": "From downtown Denver, the RTD A Line train is the most popular and budget-friendly option, running every 15 minutes to the airport in about 37 minutes from Union Station. Ride-share services like Uber or Lyft and taxis offer faster door-to-door convenience in roughly 25–35 minutes but at a higher cost. Driving yourself is also possible, with various parking options at the airport, though it tends to be the most expensive when factoring in daily parking fees.",
        "toolsUsed": [
          "article_lookup"
        ],
        "references": [
          {
            "url": "https://www.flydenver.com/parking-and-transportation/to-and-from/",
            "title": "Getting To and From | Denver International Airport",
            "favicon": "https://www.flydenver.com/apple-touch-icon.png",
            "time_published": "2026-05-15T18:36:33Z"
          },
          {
            "url": "https://flydenver.com/parking-and-transportation/to-and-from/public-bus-or-train-rtd",
            "title": "Public Bus or Train | Denver International Airport",
            "favicon": "https://flydenver.com/apple-touch-icon.png",
            "time_published": "2026-05-15T18:47:06Z"
          },
          {
            "url": "https://www.flydenver.com/parking-and-transportation/to-and-from/airport-transit-center/",
            "title": "Airport Transit Center | Denver International Airport",
            "favicon": "https://www.flydenver.com/apple-touch-icon.png",
            "time_published": "2026-05-15T18:45:07Z"
          },
          {
            "url": "https://faa.gov/air_traffic/publications/domesticnotices/dom25010_af.html",
            "title": "DENVER INTERNATIONAL AIRPORT (KDEN) standard taxi routes",
            "favicon": "https://faa.gov/air_traffic/publications/domesticnotices/assets/images/favicon.ico"
          },
          {
            "url": "https://www.fly.faa.gov/fly/flyfaa/flyfaaindex?ARPT=DEN&p=1",
            "title": "Denver International Airport"
          }
        ]
      },
      "q14": {
        "question": "Are there hotels or sleeping facilities at Lisbon airport?",
        "answer": "Lisbon Airport has two hotels directly at the airport: the Melia Lisboa Aeroporto Hotel and the Star Inn Lisboa. Both are located next to Terminal 1 and within walking distance, with airport shuttle service included. If you prefer to sleep inside the terminal, Terminal 1 stays open 24 hours and offers several reported rest spots, including benches in the food court and couches near Gate 16.",
        "toolsUsed": [
          "article_lookup"
        ],
        "references": [
          {
            "url": "https://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"
          }
        ]
      },
      "q15": {
        "question": "Are there currency exchange offices, prayer rooms and Wi‑Fi at Humberto Delgado Airport?",
        "answer": "Humberto Delgado Airport (Lisbon) has currency exchange offices and ATMs available in both the public and transit areas of Terminal 1, and free Wi-Fi is offered throughout the terminal. Prayer rooms and chapels are also provided at the airport, with a chapel located airside in Terminal 1.",
        "toolsUsed": [
          "article_lookup"
        ],
        "references": [
          {
            "url": "https://lisbon-lis.airports-guides.com",
            "title": "Lisbon Portela Airport (LIS) Information: LIS Airport in Lisbon Area, Portugal",
            "favicon": "http://www.airports-guides.com/favicon.ico"
          },
          {
            "url": "https://en.wikipedia.org/wiki/Lisbon_Airport",
            "title": "Lisbon Airport",
            "favicon": "https://en.wikipedia.org/static/apple-touch/wikipedia.png",
            "time_published": "2026-09-14T10:27:02Z"
          },
          {
            "url": "https://en.wikipedia.org/wiki/List_of_the_busiest_airports_in_Portugal",
            "title": "List of the busiest airports in Portugal",
            "time_published": "2025-05-22T19:00:42Z"
          }
        ]
      },
      "q16": {
        "question": "Are there accessible services or children's facilities at the Denver and Lisbon airports?",
        "answer": "Denver International Airport (DEN) offers extensive accessibility services, including a Hidden Disabilities Sunflower Lanyard Program, electric carts to transport elderly or disabled passengers to gates, accessible parking, and interpreter services at information booths; travelers should request wheelchair or mobility assistance from their airline at least 48 hours in advance, and Airport Butler can also provide help navigating security or with luggage. At Lisbon Portela Airport (LIS), shuttle services are available to transport travelers around the airport, and taxis and rental cars are accessible, though specific children's play areas or dedicated disability programs are not detailed in the available information. For both airports, contacting your airline or the airport directly before travel is the best way to arrange mobility assistance or inquire about family facilities.",
        "toolsUsed": [
          "article_lookup"
        ],
        "references": [
          {
            "url": "https://flydenver.com/at-the-airport/services-and-amenities/accessibility-services",
            "title": "Accessibility and Mobility | Denver International Airport",
            "favicon": "https://flydenver.com/apple-touch-icon.png",
            "time_published": "2026-08-10T20:24:04Z"
          },
          {
            "url": "https://www.flydenver.com/event/61719/",
            "title": "Accessibility Resource Fair | Denver International Airport",
            "favicon": "https://www.flydenver.com/apple-touch-icon.png",
            "time_published": "2026-07-22T17:07:58Z"
          },
          {
            "url": "https://flydenver.com/about-den/facilities",
            "title": "Airport Facilities and Grounds | Denver International Airport",
            "favicon": "https://flydenver.com/apple-touch-icon.png",
            "time_published": "2026-08-03T22:42:42Z"
          },
          {
            "url": "https://airporttech.tc.faa.gov/Products/Databases/Denver-Instrumentation/Browse-Database/Weather",
            "title": "AirportTech > Products > Databases  > Denver Instrumentation > Browse Database > Weather",
            "favicon": "https://airporttech.tc.faa.gov/Portals/0/favicon-FAA.ico?ver=L21jzf-llJYYjFtxLcsyqg%3d%3d"
          },
          {
            "url": "https://en.wikipedia.org/wiki/Denver_International_Airport",
            "title": "Denver International Airport",
            "favicon": "https://en.wikipedia.org/static/apple-touch/wikipedia.png",
            "time_published": "2026-09-11T12:43:01Z"
          },
          {
            "url": "https://lisbon-lis.airports-guides.com",
            "title": "Lisbon Portela Airport (LIS) Information: LIS Airport in Lisbon Area, Portugal",
            "favicon": "http://www.airports-guides.com/favicon.ico"
          },
          {
            "url": "https://en.wikipedia.org/wiki/Lisbon_Airport",
            "title": "Lisbon Airport",
            "favicon": "https://en.wikipedia.org/static/apple-touch/wikipedia.png",
            "time_published": "2026-09-14T10:27:02Z"
          },
          {
            "url": "https://en.wikipedia.org/wiki/Port_of_Lisbon",
            "title": "Port of Lisbon",
            "time_published": "2026-05-17T01:54:27Z"
          },
          {
            "url": "https://en.wikipedia.org/wiki/Lisbon_Luís_de_Camões_Airport",
            "title": "Lisbon Luís de Camões Airport",
            "time_published": "2026-07-07T19:34:51Z"
          }
        ]
      },
      "q17": {
        "question": "What aircraft are typically used on flights from Denver to Lisbon?",
        "answer": "There is no nonstop service from Denver to Lisbon, but connecting itineraries offer a range of aircraft. United operates the route most, with Boeing 787-10s or 777s on the long-haul leg via Newark or Washington Dulles, while British Airways uses Airbus A350-1000s via London Heathrow and Air Canada uses Boeing 777-300ERs via Toronto. Other carriers include American (Boeing 787-9 via Philadelphia), Lufthansa (Airbus A350-900 via Frankfurt or Munich), Delta (Airbus A330-900 Neo via New York JFK), and TAP Air Portugal (Airbus A321-200 Neo via Boston).",
        "methodology": "Aircraft types 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). For U.S. routes the type is grounded in the tail number that actually operated the flight; elsewhere it comes from the airline's filed equipment code. Where the source does not commit to a specific variant we name the aircraft family (for example Airbus A320 family) rather than guess, and where no reliable type is on file the aircraft is omitted rather than estimated. Types describe typical scheduled equipment and can vary with seasonal or day-of-week assignments and last-minute swaps.",
        "toolsUsed": [
          "route_aircraft"
        ]
      },
      "q20": {
        "question": "What are the best airport lounge options when departing from Denver?",
        "answer": "Denver International Airport offers several lounge options, including the American Airlines Admirals Club, American Express Centurion Lounge, Capital One Lounge (Plaza Premium), Delta Sky Club, United Club locations on Concourses A and B, United Club Fly, and the USO Denver. The United Club B Gates West location is temporarily closed. The Centurion Lounge is located on the Concourse C mezzanine near gate C-46, while the Delta Sky Club is past security at the north end of Concourse A on the bridge from Jeppesen Terminal.",
        "toolsUsed": [
          "article_lookup"
        ],
        "references": [
          {
            "url": "https://flydenver.com/at-the-airport/lounge-areas",
            "title": "Denver Airport Lounges | Denver International Airport",
            "favicon": "https://flydenver.com/apple-touch-icon.png",
            "time_published": "2026-08-03T22:37:03Z"
          },
          {
            "url": "https://www.flydenver.com",
            "title": "Denver International Airport | DEN",
            "favicon": "https://www.flydenver.com/apple-touch-icon.png",
            "time_published": "2026-09-08T14:54:34Z"
          },
          {
            "url": "https://americanexpress.com/en-us/travel/lounges/the-platinum-card/DEN",
            "title": "American Express Lounges at Denver International Airport | Amex US",
            "favicon": "https://www.americanexpress.com/apple-touch-icon-152x152.png"
          },
          {
            "url": "https://my.prioritypass.com/en-GB/lounges/united-states-of-america/denver-international",
            "title": "Denver International Airport DEN Lounges - DEN Airport Guide and lounges. | Priority Pass",
            "favicon": "https://my.prioritypass.com/icon.png?a4ff481221414a5c"
          }
        ]
      },
      "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."
      }
    }
  }
}