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

Return flights

07 Dec - 14 Dec	WestJet
01 Dec - 08 Dec	WestJet
08 Dec - 12 Dec	WestJet
06 Dec - 12 Dec	WestJet
20 Dec - 30 Dec	WestJet
24 Dec - 30 Dec	WestJet
20 Dec - 03 Jan	WestJet
18 Dec - 02 Jan	WestJet
21 Dec - 30 Dec	WestJet
22 Dec - 30 Dec	WestJet
23 Dec - 30 Dec	WestJet
07 Dec - 14 Dec	Alaska Airlines	direct

Also check the deals for one-way flights from Edmonton to Seattle 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 Edmonton to Seattle in December from $182

Return flights