Cheapest return flights from Washington to Toronto in September from $477

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

14 Sep - 19 Sep Porter Airlines (Canada) Ltd direct
14 Sep - 29 Sep Porter Airlines (Canada) Ltd direct
15 Sep - 19 Sep Porter Airlines (Canada) Ltd direct
15 Sep - 29 Sep Porter Airlines (Canada) Ltd direct
14 Sep - 03 Oct Porter Airlines (Canada) Ltd direct
14 Sep - 05 Oct Porter Airlines (Canada) Ltd direct
15 Sep - 03 Oct Porter Airlines (Canada) Ltd direct
15 Sep - 05 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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