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Route

Seattle → Denver

BFISeattleKing County International Airport - Boeing Field
DENDenverDenver International Airport
Distance
1,024 mi
Estimated flight time
~2h 35m

Denver is currently 1 hour ahead of Seattle.

Observed nonstop

View the reverse route

How often does this route fly?

Frequency

Daily at most

On average around 1 flights a day, observed from October 2025 to September 2026.

1
flights per day
2
busiest month · Jun
1
quietest month · Dec
2 hr 9 min
measured flight time
8 / 12
months seen

Through the year

Per day, month by month

  1. –Jan2026
  2. 1Feb
  3. 1Mar
  4. –Apr
  5. 1.5May
  6. 2Jun
  7. 1Jul
  8. 1Aug
  9. 1Sep
  10. –Oct2025
  11. –Nov
  12. 1Dec

In December 2025 we saw less traffic at Seattle in general than usual; compare that month with care.

In October 2025, January 2026, April 2026 we do not see this direction because of limited reception; the opposite direction is seen.

Airlines

Who flies it

United Airlinesnow and then

Through the day

Departure times

Local time in Seattle. Most departures between 07:00 and 10:00.

  1. 00:00
  2. 01:00
  3. 02:00
  4. 03:00
  5. 04:00
  6. 05:00
  7. 06:00
  8. 07:00
  9. 08:00
  10. 09:00
  11. 10:00
  12. 11:00
  13. 12:00
  14. 13:00
  15. 14:00
  16. 15:00
  17. 16:00
  18. 17:00
  19. 18:00
  20. 19:00
  21. 20:00
  22. 21:00
  23. 22:00
  24. 23:00

Through the week

By weekday

  1. 0.2Mon
  2. 0.1Tue
  3. 0.1Wed
  4. 0Thu
  5. 0.1Fri
  6. 0.1Sat
  7. 0.1Sun

Fleet

Aircraft observed

  1. Embraer Phenom 300E55P13%
  2. Learjet 45LJ459%
  3. Boeing 737-800B7386%
  4. Bombardier Challenger 300CL306%
  5. Bombardier Challenger 350CL356%
All the numbers in a table
MonthPer daySeenAirlines
January 2026We do not see this direction because of limited reception; the opposite direction is seen.
February 202618–
    March 202612–
      April 2026We do not see this direction because of limited reception; the opposite direction is seen.
      May 20261.53
      • United Airlines1×
      June 202625
      • United Airlines2×
      July 202616–
        August 202612
        • United Airlines1×
        September 202614–
          October 2025We do not see this direction because of limited reception; the opposite direction is seen.
          November 2025Not seen in this month.
          December 202512–

            Airlines observed on this route

            From observed callsign routes on BFI-DEN - not a booking guarantee.

            United Airlines

            UA · UAL

            Hub: ORD Chicago

            215 departure airportsView airline →

            About this route

            • Domestic route: both airports are in the same country.
            • The opposite direction has also been observed as a direct connection.
            • Direct destinations observed from Seattle: 63.
            • Direct destinations observed from Denver: 203.

            The airports on this route

            King County International Airport - Boeing Field

            Seattle, United StatesBFI / KBFI

            Regional airport · 63 direct destinations · 2 runways · longest runway 10,007 ft

            52 °F · Partly cloudySource: METAR observation via the NOAA Aviation Weather Center

            Airport pageAll direct destinations

            Denver International Airport

            Denver, United StatesDEN / KDEN

            International hub · 203 direct destinations · 6 runways · longest runway 16,001 ft

            43 °F · ClearSource: METAR observation via the NOAA Aviation Weather Center

            Airport pageAll direct destinations

            Alternative airports for this journey

            Same journey, a different airport nearby - with an observed direct connection.

            SEA DENSeattle–Tacoma International AirportSeattle is about 6 mi from Seattle.View route →PAE DENSeattle Paine Field International AirportEverett is about 26 mi from Seattle.View route →

            About the route from Seattle to Denver

            The observed direct connection between King County International Airport - Boeing Field (BFI) and Denver International Airport (DEN) covers approximately 1,024 mi. The estimated flight time is around 2h 35m. United Airlines has been observed on this connection in the available route data.

            Frequently asked questions about this route

            How far is Seattle from Denver by air?
            The great-circle distance between King County International Airport - Boeing Field and Denver International Airport is approximately 1,024 mi.
            How long is the flight from Seattle to Denver?
            Based on the distance, the estimated flight time is about 2h 35m. This is an estimate, not a schedule.
            Is there a direct connection from Seattle to Denver?
            Yes, a direct connection between BFI and DEN has been observed in our route data.
            Which airlines have been observed on this route?
            In the available route data: United Airlines.
            How often is there a flight from Seattle to Denver?
            On average around 1 flights a day, measured over twelve months (October 2025 to September 2026) in the flight archive, with 32 observed flights. Mainly United Airlines. That is an observation, not a timetable.
            What is the current time difference between Seattle and Denver?
            Denver is currently 1 hour ahead of Seattle.

            Where this data comes from

            The route data comes from the flight archive (ADS-B, adsb.lol): which connections actually flew over the last twelve full months and who flew them, combined with our own airport, runway, and airline datasets. It is reference data about observed routes - not a current timetable and no claim about bookability.

            The frequency and aircraft on this page come from the flight archive (ADS-B, 12 months, October 2025 to September 2026), summarized per route per month. We do not see every flight, so it is a floor, not a count.

            Route data updated on October 11, 2026.