Domestic route
Cheap flights from Seattle to Denver
Seattle-Tacoma International Airport (SEA) to Denver International Airport (DEN). 1,022 miles, 2h 25m nonstop.
SEA to DEN at a glance
Computed from airline schedules and the fares we track for this route. Refreshed several times a day.
- Distance
- 1,022 milesgreat-circle
- Typical flight time
- 2h 25mnonstop, gate to gate
- Nonstop airlines
- DLUAWNAS6 airlinesDelta, United, Southwest
- Nonstop flights per day
- 28all airlines combined
- Cheapest month
- January 2027over the next six months
- Best day to fly
- Tuesday19% less than Sunday
- Time difference
- 1h aheadDenver vs Seattle
Seattle to Denver
Round trips from $82
Per traveler, taxes and fees included. Lowest fare we found departs Tue, Jan 19.
Cheapest month: January 2027
See fares on these datesLock any fare free — pay only when you accept your last-minute deal
Or ask an agent on WhatsAppSeattle to Denver fares by month
Lowest round-trip economy fare per traveler in each of the next six months, taxes and fees included. Select a month to search that date.
Airlines flying Seattle to Denver
6 airlines fly nonstop with 28 departures a day combined, plus 1 more with one stop.
- ASAlaska AirlinesoneworldNonstop · 7 flights a day · first checked bag from $35
- DLDelta Air LinesSkyTeamNonstop · 7 flights a day · first checked bag from $35
- UAUnited AirlinesStar AllianceNonstop · 5 flights a day · first checked bag from $40
- WNSouthwest AirlinesLow-costNonstop · 4 flights a day · first checked bag from $35
- F9Frontier AirlinesLow-costNonstop · 3 flights a day · first checked bag from $55
- MXBreeze AirwaysLow-costNonstop · 2 flights a day · first checked bag from $45
- NKSpirit AirlinesLow-costConnecting via LAS · first checked bag from $55
Connecting options
Hubs where one airline can carry you on both legs, most choices first.
- Las Vegas (LAS)NK1 airline
Tips for this route
- Delta, United, Southwest and Alaska all fly SEA to DEN nonstop, so compare the total with bags before picking the lowest base fare: the difference between a basic and a standard economy ticket is often less than one checked bag each way.
- January 2027 is the cheapest month to fly over the next six months, with round trips from $82; September 2026 is the most expensive at $104 and up, a difference of $22 per traveler.
- Departing on a Tuesday averages 19% less than a Sunday on this route. If your dates are flexible, shift the outbound by a day or two and check the calendar view before you book.
- Fares on this route are usually lowest 4 to 8 weeks before departure and rise sharply inside two weeks.
Destination guide
Denver: Mile-high base camp for the Rockies
Denver International is the third-busiest airport in the country and a hub for United, Southwest and Frontier, which keeps fares low from every direction. The city itself is a lively base for the Rockies, with ski resorts 90 minutes away.
Best time to visit: June–September for hiking and Red Rocks concerts; December–March for skiing. Spring can swing from snow to 70°F in a week; September is dependably dry and golden.
Flying the other way? Denver to SeattleFares, airlines and tips for DEN to SEA.Ready to compare live fares?
See every airline on SEA–DEN side by side with bags and seat rules spelled out.
Search Seattle to DenverSeattle to Denver: common questions
How long is the flight from Seattle to Denver?
A nonstop flight from Seattle (SEA) to Denver (DEN) takes about 2h 25m gate to gate, covering 1,022 miles. Connecting itineraries add the layover, typically 1 to 3 hours more in total.
Which airlines fly nonstop from SEA to DEN?
Delta Air Lines, United Airlines, Southwest Airlines, Alaska Airlines, Frontier Airlines and Breeze Airways operate nonstop flights from Seattle (SEA) to Denver (DEN), with 28 nonstop departures a day between them. One-stop options connect through LAS.
What is the cheapest month to fly from Seattle to Denver?
Over the next six months, January 2027 has the lowest round-trip fares from Seattle (SEA) to Denver (DEN), starting at $82 per traveler including taxes and fees. Within any month, Tuesday departures average the lowest prices.
How far in advance should I book Seattle to Denver flights?
Fares on this route are usually lowest 4 to 8 weeks before departure and rise sharply inside two weeks. Air1 Tickets includes free cancellation within 24 hours of booking on every fare, so you can lock in a good price and keep looking.
What is the time difference between Seattle and Denver?
Denver is 1 hour ahead of Seattle. SEA is on America/Los Angeles time and DEN on America/Denver time. Departure and arrival times in search results are always shown in local time at each airport.
Related routes
Other popular city pairs from the same departure city and to the same destination, with the lowest round-trip fares we found.