AirHint found the following cheapest return flights from Boston (BOS) to Calgary (YYC) in May 2026 (see full year).
Return flights
| 08 May - 11 May | United | ||
| 09 May - 15 May | Air Canada | ||
| 08 May - 11 May | WestJet | direct | |
| 09 May - 15 May | WestJet | direct | |
| 11 May - 15 May | American Airlines | ||
| 11 May - 15 May | WestJet | direct |
Also check the deals for one-way flights from Boston to Calgary in May.
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