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

One-Way flights

18 Sep	Porter Airlines (Canada) Ltd
25 Sep	Porter Airlines (Canada) Ltd
16 Sep	Porter Airlines (Canada) Ltd
21 Sep	WestJet	direct
25 Sep	WestJet	direct
16 Sep	WestJet	direct
05 Sep	Air Canada
05 Sep	WestJet	direct
18 Sep	WestJet	direct

Also check the deals for return 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 one-way flights from Boston to Calgary in September from 48€

One-Way flights