Cheapest one-way flights from Seattle to Denver in December from $52

AirHint found the following cheapest one-way flights from Seattle (SEA) to Denver (DEN) in December 2025 (see full year).

One-Way flights

07 Dec Frontier Airlines direct
15 Dec Frontier Airlines direct
03 Dec Alaska Airlines direct
16 Dec Alaska Airlines direct
17 Dec Alaska Airlines direct
19 Dec Frontier Airlines direct
28 Dec Frontier Airlines direct
26 Dec Frontier Airlines direct

Also check the deals for return flights from Seattle to Denver in December.

Skyscanner

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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