Cheapest return flights from Washington to Toronto in September from $259

Best time to book flights for Washington (IAD) to Toronto (YTZ) flights at AirHint

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

Return flights

04 Sep - 08 Sep Porter Airlines (Canada) Ltd direct
03 Sep - 04 Sep Porter Airlines (Canada) Ltd direct
03 Sep - 08 Sep Porter Airlines (Canada) Ltd direct
13 Sep - 28 Sep Porter Airlines (Canada) Ltd direct
13 Sep - 03 Oct Porter Airlines (Canada) Ltd direct
08 Sep - 28 Sep Porter Airlines (Canada) Ltd direct
18 Sep - 21 Sep Air Transat direct
16 Sep - 21 Sep Porter Airlines (Canada) Ltd direct
16 Sep - 22 Sep 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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