DEN to SEA: Distance and Flight Time
The distance from Denver International Airport (DEN) to Seattle–Tacoma International Airport (SEA) is 1,645 km (1,022 mi). A typical nonstop flight covers it in about 2h 35m, heading northwest. The distance is the same in either direction (SEA to DEN).
How far is it from Denver to Seattle?
The great-circle distance between Denver International Airport (DEN) and Seattle–Tacoma International Airport (SEA) is 1,645 km (1,022 mi, 888 nautical miles). That is the straight-line distance; a real flight is a little longer because of air-traffic routing.
How long is the flight from DEN to SEA?
A nonstop flight typically takes about 2h 35m. This is an estimate from the distance; actual block times depend on the aircraft, winds and the exact routing. SEA is roughly northwest of DEN.
How is the DEN to SEA route written in code?
The pair is written DEN-SEA in IATA codes and KDEN-KSEA in ICAO codes, the form used on a flight plan. Denver International Airport is DEN (KDEN), Seattle–Tacoma International Airport is SEA (KSEA).
| DEN | SEA | |
|---|---|---|
| Airport | Denver International Airport | Seattle–Tacoma International Airport |
| ICAO code | KDEN | KSEA |
| Country | United States | United States |
| Elevation | 5,431 ft | 433 ft |
| Rank by connections | #15 | #67 |
Both ICAO codes start with K, the prefix ICAO assigns to the contiguous United States, so this is a route inside one ICAO region. How ICAO prefixes are laid out.
SEA sits 4,998 ft (1,523 m) lower than DEN, which is a real difference in air density on takeoff.
Airlines flying DEN to SEA
4 airlines appear on this route in the open route dataset, 4 of them still listed as active. Each row gives the IATA code, the ICAO code and the radio callsign, which is what an air traffic controller hears:
| IATA | Airline | ICAO | Callsign | Status |
|---|---|---|---|---|
| AS | Alaska Airlines | ASA | Alaska | Active |
| F9 | Frontier Airlines | FFT | Frontier Flight | Active |
| UA | United Airlines | UAL | United | Active |
| WN | Southwest Airlines | SWA | Southwest | Active |
A further 2 carriers sell this pair as a codeshare without operating it: AA, FL.
Route and carrier data comes from the OpenFlights open dataset, regenerated here on . It is a historical snapshot of scheduled connections, not a live schedule, and it includes codeshare listings, so some carriers shown may no longer operate the route or exist. How we build this · Data and sources.
Frequently asked questions
How far is Denver from Seattle?
Denver International Airport (DEN) and Seattle–Tacoma International Airport (SEA) are 1,645 km (1,022 mi, 888 nautical miles) apart in a straight line.
How long is the flight from DEN to SEA?
A typical nonstop flight between DEN and SEA takes about 2h 35m. Actual times vary with aircraft type, winds and routing.
What direction is SEA from DEN?
Seattle–Tacoma International Airport (SEA) lies roughly northwest of Denver International Airport (DEN).
Which airlines fly DEN to SEA?
4 airlines appear on the DEN-SEA route in the open dataset, including Alaska Airlines, Frontier Airlines, United Airlines.
Related routes
Other routes from Denver (DEN):
Other routes from Seattle (SEA):
DEN airport code · SEA airport code · Busiest airports worldwide