Alaska Airlines, ATI, Delta Air Lines, Frontier Airlines, Southwest Airlines and United Airlines operate nonstop flights from Seattle (SEA) to Denver (DEN). The nonstop flight takes around ~2h 3m, covering 1,022 miles (1,645 km) and operates multiple daily. Round-trip fares currently start at $153, with a typical fare around $341 across 221 recent fare combinations. Updated 28 June 2026.
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Yes, Alaska Airlines, ATI and 4 more airlines operate nonstop flights from Seattle (SEA) to Denver (DEN).
Alaska Airlines, ATI, Delta Air Lines, Frontier Airlines, Southwest Airlines, United Airlines operate nonstop flights from Seattle to Denver.
The nonstop flight from Seattle to Denver takes ~2h 3m (approximately 1645 km).
Nonstop flights from Seattle to Denver operate multiple daily.
Round-trip flights from Seattle (SEA) to Denver (DEN) start at $153, with a typical fare around $341. Based on 221 recent fare combinations.