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

Return flights

25 Sep - 02 Oct	WestJet	direct
16 Sep - 21 Sep	Porter Airlines (Canada) Ltd
07 Sep - 11 Sep	WestJet
19 Sep - 23 Sep	Spirit Airlines
01 Sep - 05 Sep	WestJet
16 Sep - 21 Sep	WestJet	direct
01 Sep - 05 Sep	WestJet	direct
19 Sep - 23 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.

Book a cheap hotel in Calgary

Cheap car rent in Calgary

Cheapest return flights from Boston to Calgary in September from 133€

Return flights