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

Return flights

26 Sep - 29 Sep	American Airlines
17 Sep - 22 Sep	Delta
19 Sep - 22 Sep	American Airlines
12 Sep - 19 Sep	American Airlines
13 Sep - 27 Sep	Alaska Airlines
08 Sep - 12 Sep	Delta
05 Sep - 10 Sep	American Airlines
11 Sep - 13 Sep	American Airlines
13 Sep - 20 Sep	Alaska Airlines
04 Sep - 08 Sep	American Airlines
28 Sep - 24 Oct	WestJet
24 Sep - 01 Oct	Alaska Airlines
20 Sep - 04 Oct	Alaska Airlines

Also check the deals for one-way flights from Washington to Calgary 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.

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Cheapest return flights from Washington to Calgary in September from $315

Return flights