Cheapest return flights from Washington to Toronto in September from $186

AirHint found the following cheapest return flights from Washington (IAD) to Toronto (YTZ) in September 2025 (see full year).

Return flights

04 Sep - 06 Sep Porter Airlines (Canada) Ltd direct
04 Sep - 07 Sep Porter Airlines (Canada) Ltd direct
05 Sep - 07 Sep Porter Airlines (Canada) Ltd direct
10 Sep - 14 Sep Porter Airlines (Canada) Ltd direct
29 Sep - 10 Oct Porter Airlines (Canada) Ltd direct
23 Sep - 26 Sep Porter Airlines (Canada) Ltd direct
25 Sep - 28 Sep Porter Airlines (Canada) Ltd direct
08 Sep - 11 Sep Porter Airlines (Canada) Ltd direct
10 Sep - 23 Sep Porter Airlines (Canada) Ltd direct
10 Sep - 16 Sep Porter Airlines (Canada) Ltd direct
28 Sep - 04 Oct Porter Airlines (Canada) Ltd direct
28 Sep - 18 Oct Porter Airlines (Canada) Ltd direct
28 Sep - 19 Oct Porter Airlines (Canada) Ltd direct
28 Sep - 17 Oct Porter Airlines (Canada) Ltd direct
13 Sep - 16 Sep Porter Airlines (Canada) Ltd direct
28 Sep - 11 Oct Porter Airlines (Canada) Ltd direct
28 Sep - 05 Oct Porter Airlines (Canada) Ltd direct
28 Sep - 10 Oct Porter Airlines (Canada) Ltd direct
29 Sep - 19 Oct Porter Airlines (Canada) Ltd direct
29 Sep - 20 Oct Porter Airlines (Canada) Ltd direct

Also check the deals for one-way flights from Washington to Toronto in September.

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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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