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

Return flights

20 Oct - 24 Nov	WestJet
10 Oct - 12 Oct	Alaska Airlines	direct
11 Oct - 13 Oct	Alaska Airlines	direct
16 Oct - 28 Oct	WestJet
18 Oct - 18 Oct	Alaska Airlines
20 Oct - 24 Nov	Alaska Airlines	direct
01 Oct - 04 Oct	WestJet
18 Oct - 18 Oct	Delta	direct
11 Oct - 25 Oct	Delta	direct
24 Oct - 26 Oct	WestJet
13 Oct - 17 Oct	Alaska Airlines	direct
11 Oct - 12 Oct	Air Canada	direct

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

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 October from $156

Return flights