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

Return flights

29 Aug - 05 Sep	WestJet
20 Aug - 30 Aug	WestJet
14 Aug - 18 Aug	WestJet
30 Aug - 06 Sep	United
24 Aug - 27 Aug	WestJet
16 Aug - 19 Aug	WestJet
29 Aug - 05 Sep	Alaska Airlines	direct
10 Aug - 20 Aug	WestJet
08 Aug - 10 Aug	Air Canada
08 Aug - 10 Aug	Alaska Airlines	direct
14 Aug - 18 Aug	Alaska Airlines	direct
01 Aug - 03 Aug	Alaska Airlines	direct

Also check the deals for one-way flights from Edmonton to Seattle in August.

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 August from $178

Return flights