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

Return flights

28 Sep - 04 Oct	WestJet	direct
30 Sep - 07 Oct	WestJet	direct
28 Sep - 07 Oct	WestJet	direct
28 Sep - 06 Oct	WestJet	direct
28 Sep - 17 Oct	WestJet	direct
30 Sep - 06 Oct	WestJet	direct
30 Sep - 17 Oct	WestJet	direct
06 Sep - 09 Sep	WestJet	direct
30 Sep - 21 Oct	United
05 Sep - 07 Sep	WestJet
30 Sep - 14 Oct	WestJet
28 Sep - 21 Oct	WestJet
05 Sep - 07 Sep	WestJet	direct

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

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 Boston to Calgary in September from $162

Return flights