Cheapest return flights from Boston to Toronto in May from $420

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

Return flights

01 May - 04 May Delta
06 May - 11 May Delta
29 May - 01 Jun WestJet
08 May - 10 May Sun Country Airlines
22 May - 25 May WestJet
08 May - 10 May Air Canada direct
06 May - 11 May Air Canada direct
10 May - 16 May Air Canada direct
29 May - 01 Jun Air Canada direct
27 May - 03 Jun Air Canada direct
01 May - 04 May Air Canada direct
22 May - 25 May Air Canada direct

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

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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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