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

Return flights

28 Aug - 31 Aug	Air Canada
20 Aug - 27 Aug	Air Canada
22 Aug - 27 Aug	WestJet
22 Aug - 29 Aug	WestJet
22 Aug - 24 Aug	WestJet
19 Aug - 26 Aug	WestJet
24 Aug - 25 Aug	WestJet
21 Aug - 26 Aug	WestJet
23 Aug - 26 Aug	WestJet
29 Aug - 01 Sep	WestJet
30 Aug - 01 Sep	WestJet
17 Aug - 20 Aug	WestJet

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 136€

Return flights