Cheap Flights from Seattle to Denver
Compare cheap flights from Seattle (SEA) to Denver (DEN) on Tripile, with fares from around $99. The route takes about 2h 50m, and April is often the best month for low prices.
Airlines on This Route
Popular airlines flying Seattle to Denver include Alaska Airlines, Southwest, United, Frontier. Compare their schedules, baggage rules, and prices side by side, then book the option that fits your trip.
With 4 carriers commonly serving SEA to DEN, 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 50m sector.
When to Book SEA to DEN
Fares on this route start from around $99, and April typically brings the lowest prices. Search with flexible dates to compare a whole month at once, check the return leg from Denver to Seattle in the same search, and review the fare rules before paying so you know what a change or cancellation would cost.