Cheapest return flights from Boston to Toronto in May from $320

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

Return flights

25 May - 28 May Porter Airlines (Canada) Ltd
29 May - 01 Jun Porter Airlines (Canada) Ltd
31 May - 09 Jun Porter Airlines (Canada) Ltd
10 May - 28 May Porter Airlines (Canada) Ltd
10 May - 21 May Porter Airlines (Canada) Ltd
19 May - 28 May Porter Airlines (Canada) Ltd
19 May - 21 May Porter Airlines (Canada) Ltd
07 May - 28 May Porter Airlines (Canada) Ltd
07 May - 21 May Porter Airlines (Canada) Ltd
21 May - 24 May Porter Airlines (Canada) Ltd
21 May - 23 May Porter Airlines (Canada) Ltd
10 May - 20 May Porter Airlines (Canada) Ltd
20 May - 01 Jun Porter Airlines (Canada) Ltd
25 May - 11 Jun Porter Airlines (Canada) Ltd
25 May - 07 Jun Porter Airlines (Canada) Ltd
25 May - 06 Jun Porter Airlines (Canada) Ltd
25 May - 08 Jun Porter Airlines (Canada) Ltd
25 May - 12 Jun Porter Airlines (Canada) Ltd
19 May - 07 Jun Porter Airlines (Canada) Ltd
19 May - 06 Jun Porter Airlines (Canada) Ltd

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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