Direct (nonstop) flights from Denver to Seattle
5 airlines fly nonstop from Denver International (DEN) to Seattle Tacoma International (SEA). It's 1,023 miles (1,647 km), about 3h 2m in the air. Operated by Alaska Airlines, Delta Air Lines, Frontier Airlines and others.
Alaska Airlines
Delta Air Lines
Frontier Airlines
United Airlines
Southwest Airlines
Route data last updated: May 27, 2026
Airlines with non-stop flights
AS
Alaska Airlines
DL
Delta Air Lines
F9
Frontier Airlines
UA
United Airlines
WN
Southwest Airlines
Alternative Routes
Other ways to fly from Denver to Seattle with one stop · direct emits 173 kg CO₂ per passenger
Looking for the return flight?
SEA → DEN: Flights from Seattle to DenverOther direct flights from Denver
Direct flights from Seattle (SEA)
Frequently Asked Questions
How long is the direct flight from Denver to Seattle?
A nonstop flight from Denver (DEN) to Seattle (SEA) takes approximately 3 hours and 2 minutes. The distance is 1,023 miles (1,647 km).
Which airlines fly nonstop from Denver to Seattle?
5 airlines: Alaska Airlines, Delta Air Lines, Frontier Airlines, United Airlines, Southwest Airlines.
Is there a nonstop flight from Denver to Seattle?
Yes. 5 airlines: Alaska Airlines, Delta Air Lines, Frontier Airlines, United Airlines, Southwest Airlines.
How far is Denver from Seattle?
The flight distance from Denver to Seattle is 1,023 miles (1,647 km), measured as the great-circle (shortest air) distance. That's roughly the same distance as New York to Miami.
What type of aircraft flies from Denver to Seattle?
At 3h 2m, this route typically uses narrow-body or mid-range jets — Boeing 737 MAX or Airbus A320neo. Varies by airline.
What is the carbon footprint of a flight from Denver to Seattle?
Roughly 173 kg CO2 per passenger one-way. That's about the same as driving 865 km.
Is the return flight from Seattle to Denver also nonstop?
Yes — nonstop flights run both ways. Flight time may differ slightly due to wind patterns.
When is the cheapest time to fly from Denver to Seattle?
Midweek flights (Tue/Wed) outside holiday peaks are usually cheapest. 3-6 weeks ahead is a good window for this route. Use "Check Prices" above to compare.
How early should I arrive at Denver International for this flight?
1.5-2 hours for domestic. Add more time during holidays or busy travel weekends.