Cheap flights from Denver International to Seattle-Tacoma from $169
Updated 2026-07-26
1022 miles great-circle distance, typically flown in 2h 27m with 6 airlines operating direct service from Denver International (DEN) to Seattle-Tacoma (SEA). Fares on this corridor stay relatively stable across the year — booking 4–8 weeks ahead and choosing a midweek departure typically secures the best price.
Flying from Denver International
Denver International sits 25 miles northeast of downtown Denver — a deliberately remote site that allows for six runways and almost unlimited expansion. The A Line commuter train runs every 15 minutes from the airport directly to Union Station downtown in 37 minutes for $10.50. United dominates the schedule with its largest non-Newark hub; Southwest and Frontier add heavy domestic capacity. Snow disruption is common between November and March, but the airport's ground-stop policy is faster than ORD's.
Arriving in Seattle
Seattle-Tacoma is 14 miles south of downtown Seattle, with the Link Light Rail Red Line running directly from the airport station to Westlake in 38 minutes for $3.25 — possibly the simplest big-city airport transfer in the United States. Fares peak in mid-summer (June–August) and around Bumbershoot/Labor Day; January and February are the cheapest months despite winter rain.
Who flies DEN to SEA?
| Airline | IATA | Flight time | Cabin |
| United Airlines | UA | 2h 27m | Economy |
| Southwest Airlines | WN | 2h 27m | Economy |
| Frontier Airlines | F9 | 2h 27m | Economy |
| Spirit Airlines | NK | 2h 27m | Economy |
| American Airlines | AA | 2h 27m | Economy |
| Delta Air Lines | DL | 2h 27m | Economy |
6 carriers fly direct on this corridor. Frequencies vary by season — summer and winter holiday peaks see additional flights.
Denver to Seattle FAQs
Direct flights from Denver International (DEN) to Seattle-Tacoma (SEA) take approximately 2h 27m for the 1022-mile journey, plus 30–60 minutes of taxi, climb and descent. Total airport-to-airport time depends on cruise winds and air-traffic queueing on approach.
6 carriers operate direct service from Denver International (DEN) to Seattle-Tacoma (SEA): United Airlines, Southwest Airlines, Frontier Airlines, Spirit Airlines, American Airlines and 1 more. Frequencies vary by season and carrier — United Airlines typically operates the highest weekly count on this corridor.
No — United States is domestic travel for US citizens. A US passport is not required for the 50 states, DC or US territories (Puerto Rico, US Virgin Islands, Guam, American Samoa, Northern Mariana Islands), though Real ID-compliant ID is required at TSA from May 2025.
Seattle-Tacoma (SEA) is the primary international airport for Seattle. Allow 30–60 minutes for the ground transfer by train, express bus, taxi or rideshare depending on traffic and time of day. See the airport's official website for current train and shuttle timetables.