Cheap Flights from Denver to Seattle
Compare cheap flights from Denver (DEN) to Seattle (SEA) on Tripile, with fares from around $89. The route takes about 2h 45m, and May is often the best month for low prices.
Airlines on This Route
Popular airlines flying Denver to Seattle include Southwest, United, Frontier, Alaska. Compare their schedules, baggage rules, and prices side by side, then book the option that fits your trip.
With 4 carriers commonly serving DEN to SEA, departure times are spread across the day, so it is worth checking early-morning and late-evening flights when you want the lowest fare on a 2h 45m sector.
When to Book DEN to SEA
Fares on this route start from around $89, and May typically brings the lowest prices. Search with flexible dates to compare a whole month at once, check the return leg from Seattle to Denver in the same search, and review the fare rules before paying so you know what a change or cancellation would cost.