AirHint found the following cheapest return flights from Boston (BOS) to Calgary (YYC) in May 2026 (see full year).

Return flights

08 May - 12 May	WestJet	direct
07 May - 10 May	WestJet	direct
15 May - 19 May	WestJet	direct
10 May - 17 May	WestJet	direct
26 May - 31 May	Spirit Airlines
26 May - 08 Jun	Porter Airlines (Canada) Ltd
26 May - 31 May	WestJet	direct
26 May - 08 Jun	WestJet	direct

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

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 May from $186

Return flights