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

Return flights

23 Aug - 30 Aug	WestJet	direct
26 Aug - 28 Aug	Air Canada
25 Aug - 29 Aug	WestJet
18 Aug - 26 Aug	WestJet
17 Aug - 25 Aug	WestJet
27 Aug - 31 Aug	WestJet
18 Aug - 24 Aug	WestJet	direct
28 Aug - 01 Sep	WestJet
23 Aug - 27 Aug	Delta
15 Aug - 18 Aug	WestJet
15 Aug - 22 Aug	Spirit Airlines
27 Aug - 01 Sep	WestJet	direct

Also check the deals for one-way flights from Boston to Calgary 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 Boston to Calgary in August from 127€

Return flights