Cheapest return flights from Boise to Seattle in December from $99

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

Return flights

23 Dec - 31 Dec Hawaiian Airlines direct
31 Dec - 03 Jan Alaska Airlines direct
24 Dec - 27 Dec Alaska Airlines direct
17 Dec - 30 Dec Delta direct
19 Dec - 21 Dec Alaska Airlines direct
13 Dec - 07 Jan Southwest Airlines
13 Dec - 07 Jan Alaska Airlines direct
18 Dec - 19 Dec Alaska Airlines direct
11 Dec - 14 Dec Alaska Airlines direct
04 Dec - 08 Dec Alaska Airlines direct
04 Dec - 05 Dec Alaska Airlines direct
03 Dec - 04 Dec Alaska Airlines direct

Also check the deals for one-way flights from Boise to Seattle in December.

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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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