$240 Cheap United flights Denver (DEN) to Seattle (SEA)

View $240 flight on Thu, Jan 1, 2026Opens in a new window

$240 Cheap United flights Denver (DEN) to Seattle (SEA)

Prices were available within the past 7 days and start at $240 for one-way flights and $329 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Thu, Jan 1 - Sun, Jan 4
DEN
Denver
SEA
Seattle
$329 Roundtrip, found 4 days ago
$329
Roundtrip
found 4 days ago
Select United flight, departing Thu, Jan 1 from Denver to Seattle, returning Sun, Jan 4, priced at $329 found 4 days ago

Find the cheapest month to fly from Denver (DEN) to Seattle (SEA)

February is typically the cheapest month to fly

From $58 - $143 per traveler.

Alternative airports near Seattle

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Seattle - Tacoma Intl. SEA. Cheapest option available. Average driving time to city center is 20 minutes. Flights from $260
SEA
Seattle - Tacoma Intl.
Cheapest
Average driving time to city center20 min
Flights from $260
Flights from Denver (DEN) to Seattle (SEA)
Origin airport
Denver Intl.
Destination airport
Seattle - Tacoma Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, Hawaiian Airlines, Southwest Airlines, United
Popular airline
United
Distance
1635 km
Average flight time
2 hours 3 mins