$109 Cheap Alaska Airlines flights Seattle (SEA) to Denver (DEN)

View $109 flight on Sun, Jan 4, 2026Opens in a new window

$109 Cheap Alaska Airlines flights Seattle (SEA) to Denver (DEN)

Prices were available within the past 7 days and start at $109 for one-way flights and $355 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Alaska Airlines
Sun, Dec 14 - Sat, Dec 20
SEA
Seattle
DEN
Denver
$355 Roundtrip, found 1 day ago
$355
Roundtrip
found 1 day ago
Select Alaska Airlines flight, departing Sun, Dec 14 from Seattle to Denver, returning Sat, Dec 20, priced at $355 found 1 day ago
Alaska Airlines
Sun, Dec 14 - Sat, Dec 20
SEA
Seattle
DEN
Denver
$365 Roundtrip, found 1 day ago
$365
Roundtrip
found 1 day ago
Select Alaska Airlines flight, departing Sun, Dec 14 from Seattle to Denver, returning Sat, Dec 20, priced at $365 found 1 day ago
Alaska Airlines
Wed, Dec 17 - Fri, Dec 19
SEA
Seattle
DEN
Denver
$367 Roundtrip, found 1 day ago
$367
Roundtrip
found 1 day ago
Select Alaska Airlines flight, departing Wed, Dec 17 from Seattle to Denver, returning Fri, Dec 19, priced at $367 found 1 day ago

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

February is typically the cheapest month to fly

From $58 - $152 per traveler.
Flights from Seattle (SEA) to Denver (DEN)
Origin airport
Seattle - Tacoma Intl.
Destination airport
Denver Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, Hawaiian Airlines, Southwest Airlines, United
Popular airline
Delta
Distance
1635 km
Average flight time
3 hours 37 mins