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

Return flights

15 Aug - 17 Aug	WestJet
31 Aug - 05 Sep	Porter Airlines (Canada) Ltd
22 Aug - 31 Aug	United
01 Aug - 10 Aug	WestJet	direct
15 Aug - 16 Aug	WestJet
22 Aug - 31 Aug	WestJet	direct
01 Aug - 08 Aug	WestJet
15 Aug - 17 Aug	WestJet	direct
01 Aug - 08 Aug	WestJet	direct

Also check the deals for one-way flights from Calgary to Boston 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 Calgary to Boston in August from $227

Return flights