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

Return flights

04 Sep - 10 Sep	Air Canada
24 Sep - 30 Sep	Air Canada	direct
23 Sep - 30 Sep	Air Canada	direct
04 Sep - 10 Sep	Air Canada	direct
12 Sep - 17 Sep	Air Canada	direct
14 Sep - 17 Sep	Air Canada	direct
11 Sep - 15 Sep	Air Canada	direct
19 Sep - 23 Sep	Air Canada	direct
16 Sep - 23 Sep	Air Canada	direct
11 Sep - 17 Sep	Air Canada	direct
15 Sep - 07 Oct	Air Canada	direct

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

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.

Book a cheap hotel in Toronto

Cheap car rent in Toronto

Cheapest return flights from Washington to Toronto in September from 174€

Return flights