Cheapest one-way flights from Washington to Toronto in December from $91

AirHint found the following cheapest one-way flights from Washington (IAD) to Toronto (YTZ) in December 2025 (see full year).

One-Way flights

09 Dec Porter Airlines (Canada) Ltd direct
11 Dec Porter Airlines (Canada) Ltd direct
18 Dec Porter Airlines (Canada) Ltd direct
02 Dec Porter Airlines (Canada) Ltd direct
19 Dec Porter Airlines (Canada) Ltd direct
03 Dec Porter Airlines (Canada) Ltd direct
14 Dec Porter Airlines (Canada) Ltd direct
26 Dec Porter Airlines (Canada) Ltd direct
07 Dec Porter Airlines (Canada) Ltd direct
17 Dec Porter Airlines (Canada) Ltd direct

Also check the deals for return flights from Washington to Toronto in December.

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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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