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

Return flights

27 Jul - 31 Jul	WestJet
18 Jul - 20 Jul	Delta
18 Jul - 20 Jul	WestJet	direct
10 Jul - 15 Jul	Porter Airlines (Canada) Ltd
11 Jul - 18 Jul	WestJet
08 Jul - 15 Jul	Delta
14 Jul - 18 Jul	Delta
09 Jul - 16 Jul	Porter Airlines (Canada) Ltd
13 Jul - 17 Jul	WestJet
11 Jul - 13 Jul	Delta

Also check the deals for one-way flights from Calgary to Boston in July.

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 July from 292€

Return flights