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

Return flights

22 Aug - 24 Aug	WestJet	direct
08 Aug - 10 Aug	WestJet
08 Aug - 11 Aug	WestJet
11 Aug - 12 Aug	WestJet
29 Aug - 01 Sep	WestJet
06 Aug - 20 Aug	WestJet	direct
11 Aug - 12 Aug	WestJet	direct
15 Aug - 17 Aug	WestJet	direct
27 Aug - 03 Sep	WestJet	direct
08 Aug - 10 Aug	WestJet	direct
10 Aug - 16 Aug	WestJet
03 Aug - 06 Aug	WestJet
29 Aug - 01 Sep	United	direct

Also check the deals for one-way flights from Calgary to San Francisco 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 Calgary to San Francisco in August from $165

Return flights