Denver (DEN) → Seattle (SEA)
Alaska Airlines, Delta Air Lines, Frontier Airlines, Southwest Airlines and United Airlines operate nonstop flights from Denver (DEN) to Seattle (SEA). The nonstop flight takes around ~2h 3m, covering 1,022 miles (1,645 km) and operates multiple daily. Round-trip fares currently start at $236, with a typical fare around $414 across 788 recent fare combinations. Updated 29 May 2026.
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60-day flexibility overview based on 788 recent fares across the next 60 days
Cheapest combos
Frontier
Best
Frontier
Frontier
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Alaska Airlines
AS
Delta Air Lines
DL
Frontier Airlines
F9
Southwest Airlines
WN
United Airlines
UA
Departure Schedule next 7 days
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Frequently asked questions
Is there a direct flight from Denver to Seattle?
Yes, Alaska Airlines, Delta Air Lines and 3 more airlines operate nonstop flights from Denver (DEN) to Seattle (SEA).
Which airlines fly direct from Denver to Seattle?
Alaska Airlines, Delta Air Lines, Frontier Airlines, Southwest Airlines, United Airlines operate nonstop flights from Denver to Seattle.
How long is the flight from Denver to Seattle?
The nonstop flight from Denver to Seattle takes ~2h 3m (approximately 1645 km).
How often do direct flights operate from Denver to Seattle?
Nonstop flights from Denver to Seattle operate multiple daily.
How much is a round-trip flight from Denver to Seattle?
Round-trip flights from Denver (DEN) to Seattle (SEA) start at $236, with a typical fare around $414. Based on 788 recent fare combinations.