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

Return flights

22 Aug - 26 Aug	WestJet
22 Aug - 27 Aug	WestJet
25 Aug - 29 Aug	WestJet
25 Aug - 31 Aug	WestJet
06 Aug - 16 Aug	Porter Airlines (Canada) Ltd
21 Aug - 26 Aug	Porter Airlines (Canada) Ltd
15 Aug - 18 Aug	Porter Airlines (Canada) Ltd
20 Aug - 24 Aug	Porter Airlines (Canada) Ltd
16 Aug - 29 Aug	Porter Airlines (Canada) Ltd
01 Aug - 04 Aug	Porter Airlines (Canada) Ltd

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 195€

Return flights