Cheapest return flights from Boston to Montreal in September from $501

AirHint found the following cheapest return flights from Boston (BOS) to Montreal (YUL) in September 2025 (see full year).

Return flights

30 Sep - 21 Oct Porter Airlines (Canada) Ltd
30 Sep - 17 Oct Porter Airlines (Canada) Ltd
30 Sep - 18 Oct Porter Airlines (Canada) Ltd
30 Sep - 15 Oct Porter Airlines (Canada) Ltd
30 Sep - 11 Oct Porter Airlines (Canada) Ltd
30 Sep - 20 Oct Porter Airlines (Canada) Ltd
30 Sep - 07 Oct Porter Airlines (Canada) Ltd
30 Sep - 09 Oct Porter Airlines (Canada) Ltd
30 Sep - 16 Oct Porter Airlines (Canada) Ltd
30 Sep - 14 Oct Porter Airlines (Canada) Ltd
29 Sep - 30 Sep Porter Airlines (Canada) Ltd
28 Sep - 29 Sep Porter Airlines (Canada) Ltd
28 Sep - 30 Sep Porter Airlines (Canada) Ltd
27 Sep - 30 Sep Porter Airlines (Canada) Ltd

Also check the deals for one-way flights from Boston to Montreal in September.

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