Cheapest one-way flights from Boise to Seattle in December from $69

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

One-Way flights

22 Dec Alaska Airlines direct
31 Dec Alaska Airlines direct
21 Dec Frontier Airlines
11 Dec Frontier Airlines
14 Dec Frontier Airlines
12 Dec Frontier Airlines
07 Dec Allegiant Air
19 Dec Allegiant Air
05 Dec Frontier Airlines
20 Dec Alaska Airlines direct

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

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