Direct (nonstop) flights from Seattle to Denver
5 airlines fly nonstop from Seattle Tacoma International (SEA) to Denver International (DEN). It's 1,023 miles (1,647 km), about 2h 49m 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 29, 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 Seattle to Denver with one stop · direct emits 173 kg CO₂ per passenger
Looking for the return flight?
DEN → SEA: Flights from Denver to SeattleOther direct flights from Seattle
Direct flights from Denver (DEN)
Frequently Asked Questions
How long is the direct flight from Seattle to Denver?
A nonstop flight from Seattle (SEA) to Denver (DEN) takes approximately 2 hours and 49 minutes. The distance is 1,023 miles (1,647 km).
Which airlines fly nonstop from Seattle to Denver?
5 airlines: Alaska Airlines, Delta Air Lines, Frontier Airlines, United Airlines, Southwest Airlines.
Is there a nonstop flight from Seattle to Denver?
Yes. 5 airlines: Alaska Airlines, Delta Air Lines, Frontier Airlines, United Airlines, Southwest Airlines.
How far is Seattle from Denver?
The flight distance from Seattle to Denver 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 Seattle to Denver?
At 2h 49m, 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 Seattle to Denver?
Roughly 173 kg CO2 per passenger one-way. That's about the same as driving 865 km.
Is the return flight from Denver to Seattle 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 Seattle to Denver?
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 Seattle Tacoma International for this flight?
1.5-2 hours for domestic. Add more time during holidays or busy travel weekends.