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

Return flights

13 Dec - 20 Dec	Alaska Airlines	direct
12 Dec - 14 Dec	Alaska Airlines	direct
01 Dec - 15 Dec	Alaska Airlines
01 Dec - 15 Dec	Delta	direct
17 Dec - 24 Dec	Air Canada	direct
23 Dec - 31 Dec	Air Canada	direct
23 Dec - 26 Dec	Air Canada	direct
22 Dec - 29 Dec	Alaska Airlines	direct
23 Dec - 30 Dec	Alaska Airlines	direct
18 Dec - 26 Dec	Air Canada	direct

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

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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Cheapest return flights from Seattle to Vancouver in December from $167

Return flights