{
  "response": {
    "Key": "DEN-US",
    "orig": {
      "code": "DEN",
      "type": "airport",
      "city": "Denver",
      "fullCity": "Denver, Colorado",
      "airport": "Denver Intl Airport"
    },
    "dest": {
      "code": "US",
      "type": "country",
      "country": "United States"
    },
    "faq": {
      "q0": {
        "question": "Which cities in United States can I fly to from Denver?",
        "answer": "United Airlines and Southwest offer many non-stop routes from Denver to cities across the U.S., including Los Angeles, San Francisco, Seattle, Chicago, Dallas, Houston, New York, Atlanta and Orlando. One-stop connections via those hubs reach most other domestic airports."
      },
      "q2": {
        "question": "Are there direct flights from Denver to United States?",
        "answer": "Since Denver is already in the United States, non‑stop flights to other U.S. cities are available from Denver International Airport. Major carriers such as United, Southwest, Frontier, American, and Delta offer non‑stop service to hubs like Chicago, Dallas, Los Angeles, New York, San Francisco, and many others. Flight times vary by distance; for example, Denver to Chicago takes about 2½ hours, while Denver to New York takes roughly 3½ to 4 hours."
      },
      "q3": {
        "question": "Which airlines fly from Denver to United States?",
        "answer": "United, Southwest and Frontier offer nonstop flights from Denver to many U.S. cities. American and Delta serve via their hubs."
      },
      "q4": {
        "question": "When is the cheapest time to fly from Denver to United States?",
        "answer": "From Denver, late summer into early fall — especially August and September — tends to be the cheapest time to fly domestically, with April also offering lower fares. Booking roughly 6 to 9 weeks ahead usually yields the best prices, and midweek departures (Tuesday/Wednesday) and early-morning or late-evening flights are typically less expensive. Peak summer months like June and the December holiday period are almost always pricier.",
        "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. 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."
      },
      "q5": {
        "question": "How far in advance should I book flights from Denver to United States?",
        "answer": "For flights from Denver to destinations across the United States, the optimal booking window is about 6 to 9 weeks ahead, when average fares hover around $130.",
        "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."
      },
      "q6": {
        "question": "What are the most popular cities to visit in United States?",
        "answer": "For the United States, top cities include New York for culture and landmarks, Los Angeles for entertainment and beaches, Chicago for architecture and dining, Miami for nightlife and coast, and Las Vegas for entertainment and desert escapes."
      },
      "q13": {
        "question": "How do I get to Denver Intl Airport from the city center?",
        "answer": "The A Line commuter train connects downtown Denver’s Union Station to the airport transit center in about 37 minutes, making it the fastest and most popular option. RTD bus routes like the 104L also serve the airport, while shared-ride shuttles, taxis, and rideshare services offer door-to-door convenience at a higher cost. Driving and parking are available with economy lots linked by shuttle, but the train remains the most reliable and affordable choice for most travelers.",
        "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."
      }
    }
  }
}