Cheapest return flights from Calgary to San Francisco in September from $148

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

Return flights

09 Sep - 23 Sep WestJet
20 Sep - 27 Sep WestJet
09 Sep - 23 Sep WestJet direct
23 Sep - 29 Sep WestJet
20 Sep - 27 Sep WestJet direct
03 Sep - 09 Sep WestJet direct
23 Sep - 29 Sep WestJet direct
29 Sep - 06 Oct WestJet direct
10 Sep - 17 Sep WestJet
15 Sep - 22 Sep WestJet direct
01 Sep - 04 Sep WestJet

Also check the deals for one-way flights from Calgary to San Francisco in September.

Skyscanner

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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