Direct flights from Denver to Seattle DEN → SEA
Alaska Airlines, Delta Air Lines, Frontier Airlines, Southwest Airlines and United Airlines fly nonstop from Denver (DEN) to Seattle (SEA), several times daily. The flight takes about 2h 37m and covers 1,022 miles (1,645 km). Round-trip fares typically run around $307, with recent bookable fares from $168. Arrivals run on time 80.3% at DEN and 80.8% at SEA — BTS data for the last three months, counting arrivals within 15 minutes of schedule. Fares last checked 30 August 2026.
60-day flexibility overview based on 1721 recent fares across the next 60 days
What flexibility is worth here
Flying in October rather than September typically saves $41 on DEN → SEA.
Typical round-trip fare by departure month, across the 5 months we currently track.
How long you stay changes it too
Staying 10–16 nights typically costs $20 less than 6–9 nights.
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Alaska Airlines
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Delta Air Lines
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Frontier Airlines
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United Airlines
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Departure Schedule typical week
Typical weekly schedule · 116 flights per week (~17 per day) · Updated 53d ago
Alaska Airlines
Delta Air Lines
Frontier Airlines
United Airlines
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 37m (approximately 1645 km).
How often do direct flights operate from Denver to Seattle?
Nonstop flights from Denver to Seattle operate multiple daily — 116 flights per week (~17 per day).
What is the on-time performance for flights from Denver to Seattle?
Arrivals run on time 80.3% at DEN and 80.8% at SEA — BTS data for the last three months, counting arrivals within 15 minutes of schedule.
What days of the week are there direct flights from Denver to Seattle?
Direct flights from Denver to Seattle operate every day of the week. Alaska Airlines flies daily, Delta Air Lines flies daily, Frontier Airlines flies daily, and United Airlines flies daily.
How much is a round-trip flight from Denver to Seattle?
Round-trip flights from Denver (DEN) to Seattle (SEA) start at $168, with a typical fare around $307. Based on 1721 recent fare combinations.
What is the cheapest month to fly from Denver to Seattle?
Across the 5 departure months we currently track, October 2026 is the cheapest month to fly round trip from Denver to Seattle, with typical fares around $297 — versus about $338 in September 2026, the most expensive.
Does trip length change the round-trip fare from Denver to Seattle?
Typical round-trip fares from Denver (DEN) to Seattle (SEA) by trip length: a short trip (1–5 nights) about $293, a week away (6–9 nights) about $312, around two weeks (10–16 nights) about $292, and a longer stay (17+ nights) about $295. Medians from 1721 recent fare combinations.
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Scout — our search agent — priced 1,696 fares on this route in the past week, cheapest $168 round trip. It hunts nonstop fares from Denver every night and pings you when one's worth booking.
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