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

Return flights

25 Aug - 03 Sep	Frontier Airlines
29 Aug - 06 Sep	WestJet
29 Aug - 08 Sep	WestJet
24 Aug - 03 Sep	Frontier Airlines
29 Aug - 03 Sep	WestJet
26 Aug - 04 Sep	jetBlue
31 Aug - 07 Sep	Spirit Airlines
25 Aug - 29 Aug	Frontier Airlines
23 Aug - 03 Sep	Spirit Airlines
28 Aug - 03 Sep	WestJet
25 Aug - 02 Sep	Frontier Airlines
26 Aug - 28 Aug	jetBlue
29 Aug - 31 Aug	WestJet
22 Aug - 29 Aug	Frontier Airlines
28 Aug - 30 Aug	WestJet
28 Aug - 31 Aug	WestJet
22 Aug - 27 Aug	Spirit Airlines
20 Aug - 24 Aug	Spirit Airlines
19 Aug - 23 Aug	Spirit Airlines
22 Aug - 23 Aug	jetBlue

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 256€

Return flights