Seattle (SEA) to Denver (DEN) is about 1,022 miles (1,645 km), roughly 2 h 35 min of flying time. Denver is 1 hour ahead of Seattle all year.
When is the cheapest time to fly from Seattle to Denver?
Lowest round-trip fares found in recent searches for each month (7 to 14 day trips). Pick a cheap month, then confirm the live price.
Are there nearby airports that could be cheaper?
Fares at a neighboring airport are sometimes lower. Worth comparing on this route:
- PAEPaine Field a small commercial terminal in Everett, north of Seattle.
What ID do I need for this flight?
For domestic US flights, adults need a REAL ID-compliant license or another TSA-accepted ID, such as a passport. Read our REAL ID guide.
Need a car in Denver?
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Frequently asked questions
How far is Seattle from Denver by plane?
The great-circle distance between SEA and DEN is about 1,022 miles (1,645 km).
How long does it take to fly from Seattle to Denver?
About 2 h 35 min of flying time based on distance, if a nonstop flight operates. Actual schedules vary by airline and wind, and itineraries with connections take longer.
What is the time difference between Seattle and Denver?
Denver is 1 hour ahead of Seattle all year.
Distance and flying time are calculated from airport coordinates (OurAirports data) and a typical cruise speed; they are planning estimates, not schedules. Updated 2026-10-28.
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