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

Return flights

08 Aug - 10 Aug	WestJet	direct
21 Aug - 25 Aug	WestJet
15 Aug - 18 Aug	WestJet	direct
14 Aug - 25 Aug	WestJet
18 Aug - 22 Aug	WestJet	direct
12 Aug - 12 Aug	WestJet	direct
21 Aug - 25 Aug	WestJet	direct
18 Aug - 25 Aug	WestJet	direct
14 Aug - 25 Aug	WestJet	direct
28 Aug - 31 Aug	WestJet
29 Aug - 03 Sep	WestJet
30 Aug - 02 Sep	WestJet	direct
29 Aug - 03 Sep	WestJet	direct
28 Aug - 01 Sep	WestJet
30 Aug - 01 Sep	WestJet	direct
29 Aug - 01 Sep	WestJet	direct
28 Aug - 01 Sep	WestJet	direct

Also check the deals for one-way flights from Seattle to Calgary 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 Seattle to Calgary in August from $181

Return flights