Seattle to Denver flights
Direct and connecting flights from Seattle Tacoma International Airport (SEA) to Denver International Airport (DEN) — airlines, aircraft types, and the safety record for this route.
Route FAQ
How long does the flight from Seattle to Denver take?
Flight time from Seattle (SEA) to Denver (DEN) depends on routing, aircraft type, and whether the flight is direct or connecting. A direct flight typically reflects great-circle distance plus winds, while one-stop options can add several hours depending on the layover airport. The typical block time and frequency we have observed for this route are shown above.
Which airlines fly from Seattle to Denver?
Airline availability for SEA to DEN changes by season and sometimes week to week as carriers adjust capacity. The airlines and aircraft types observed operating this route, both direct and connecting, are listed below based on real flight-tracking data.
Are there direct flights from Seattle to Denver?
Direct (nonstop) availability on SEA to DEN varies by date, day of week, and season. Busy city pairs usually have multiple daily nonstops, while thinner routes may only have direct service a few days per week or only during peak seasons.
No fatal or serious occurrence involving any operator on this pair in the last 90 days.
- Frontier Airlines58
- Alaska Airlines46
- United Airlines40
- Delta Air Lines40
- ATNNo data
| Carrier | Sightings / 90d | Safety events |
|---|---|---|
| United Airlines | 7 sightings | No recorded events |
| Frontier Airlines | 3 sightings | No recorded events |
| Delta Air Lines | 1 sighting | No recorded events |
| ATN | 1 sighting | No recorded events |
| Alaska Airlines | 1 sighting | No recorded events |
Planning SEA → DEN
SEA to DEN is a medium-haul route of 1,645 km (1,022 mi). See the return DEN → SEA route.
Alternative airports near Seattle: Seattle (BFI) — 9 km, Renton (RNT) — 9 km, Tacoma (TIW) — 28 km.
Alternative airports near Denver: Buckley (BFK) — 19 km, Denver (APA) — 36 km, Broomfield-CO (BJC) — 38 km.