Seattle-Tacoma International Airport
14 miles (23 km) from the city centre. 52.7 million passengers in 2025
| How | Route | Time | Cost |
|---|---|---|---|
| Train | Sound Transit Link 1 Line from SeaTac/Airport station to Westlake in downtown Seattle | about 38m | $3.00 one way |
Flights from Denver to Seattle
5 airlines fly nonstop from Denver to Seattle.
- Distance
- 1,020 mi
- Nonstop flight
- Varies
- Time difference
- −1h
- Nonstop airlines
- 5
Fares from Denver to Seattle
Checking today’s fares with the airlines.
Nonstop flights
| Airline | From | To |
|---|---|---|
| Alaska Airlines | DEN Denver International Airport | SEA Seattle-Tacoma International Airport |
| Delta Air Lines | DEN Denver International Airport | SEA Seattle-Tacoma International Airport |
| Frontier Airlines | DEN Denver International Airport | SEA Seattle-Tacoma International Airport |
| Southwest Airlines | DEN Denver International Airport | SEA Seattle-Tacoma International Airport |
| United Airlines | DEN Denver International Airport | SEA Seattle-Tacoma International Airport |
Nonstop service as of October 2026. Airlines change schedules seasonally.
Getting from the airport into Seattle
Before you go
This is domestic travel for US citizens: no passport or visa is needed, but travelers 18 and over need a REAL ID-compliant license or another accepted ID to fly.
Seattle is 1 hour behind Denver. Seattle uses the US dollar (USD).
Read the Seattle guide: when to go, weather, airports and tips
Frequently asked questions
How long is the flight from Denver to Seattle?
Nonstop flight times vary by airline and season; flights with a connection take longer.
Which airlines fly nonstop from Denver to Seattle?
As of October 2026, Alaska Airlines, Delta Air Lines, Frontier Airlines, Southwest Airlines and United Airlines fly this route nonstop.
How far is Seattle from Denver?
About 1,020 miles (1,641 km), measured between the city centres.
What is the time difference?
Seattle is 1 hour behind Denver.
What ID do I need to fly to Seattle?
This is domestic travel for US citizens: no passport or visa is needed, but travelers 18 and over need a REAL ID-compliant license or another accepted ID to fly.
How do I get from Seattle-Tacoma International Airport into Seattle?
Sound Transit Link 1 Line from SeaTac/Airport station to Westlake in downtown Seattle, about 38 minutes, $3.00 one way.
Related pages
Sources
Information checked in October 2026. Schedules, fares and entry rules change, so confirm with the airline or the official source before you travel.