Seattle (SEA) to Denver (DEN) flights
There are direct flights from Seattle Tacoma International Airport to Denver International Airport, sold by 5 airlines (including codeshares): American Airlines, Alaska Airlines, Frontier Airlines, United Airlines and Southwest Airlines. The distance is 1,645 km, about 2h 30m in the air. There are also 15 one-stop options, via airports such as Vancouver, Portland and Salt Lake City.
Live fares for SEA → DENSee all routes on the mapDirect flights from Seattle to Denver
| Route | Airlines (incl. codeshares) | Distance | Time (est.) |
|---|---|---|---|
| SEA → DEN | American Airlines, Alaska Airlines, Frontier Airlines, United Airlines, Southwest Airlines | 1,645 km | ~2h 30m |
Best one-stop connections
Through the biggest hubs first. Times include about 100 minutes to change planes.
| Via | Airlines | Distance | Time (est.) |
|---|---|---|---|
| YVR Vancouver | American Airlines and Air Canada then Air Canada and United Airlines | 1,994 km | ~5h 5m |
| PDX Portland | Alaska Airlines and United Airlines then Frontier Airlines and United Airlines | 1,800 km | ~4h 50m |
| SLC Salt Lake City | Alaska Airlines and Southwest Airlines then Frontier Airlines and United Airlines | 1,734 km | ~4h 45m |
| BOI Boise | Alaska Airlines then United Airlines and Southwest Airlines | 1,683 km | ~4h 45m |
| COS Colorado Springs | Alaska Airlines then United Airlines | 1,833 km | ~4h 55m |
| GEG Spokane | Alaska Airlines then Frontier Airlines and United Airlines | 1,702 km | ~4h 45m |
| EUG Eugene | Alaska Airlines then Frontier Airlines and United Airlines | 1,976 km | ~5h 5m |
| PSC Pasco | Alaska Airlines then United Airlines | 1,645 km | ~4h 40m |
| RDM Redmond-Bend | Alaska Airlines then United Airlines | 1,809 km | ~4h 50m |
| MFR Medford | Alaska Airlines then United Airlines | 2,113 km | ~5h 15m |
| BZN Bozeman | Alaska Airlines then Frontier Airlines and United Airlines | 1,715 km | ~4h 45m |
| MSO Missoula | Alaska Airlines then United Airlines | 1,715 km | ~4h 45m |
More from Seattle and Denver
- Denver (DEN) to Seattle (SEA) · return route
- All direct flights from Seattle (SEA)
- All direct flights from Denver (DEN)
- Seattle to Istanbul (IST)
- Seattle to Amsterdam (AMS)
- Seattle to Paris (CDG)
- Seattle to Frankfurt (FRA)
- Seattle to Dubai (DXB)
- Seattle to Beijing (PEK)
- Seattle to Chicago (ORD)
- Seattle to Dallas-Fort Worth (DFW)
- Seattle to Shanghai (PVG)
- Seattle to London (LHR)
- Seattle to Atlanta (ATL)
- Seattle to Houston (IAH)
- Istanbul (IST) to Denver
- Frankfurt (FRA) to Denver
- Chicago (ORD) to Denver
- Dallas-Fort Worth (DFW) to Denver
- London (LHR) to Denver
- Atlanta (ATL) to Denver
- Houston (IAH) to Denver
- New York (JFK) to Denver
- Newark (EWR) to Denver
- Toronto (YYZ) to Denver
- Los Angeles (LAX) to Denver
- Miami (MIA) to Denver
Routes come from current airline fares, updated weekly (last update 9 November 2026), plus older schedule data for airports with few recent fares. “Direct” can include a few same-plane flights with a stop. Flight times are estimates from distance. Always check with the airline before booking.