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

Return flights

03 Sep - 17 Sep	United
09 Sep - 10 Sep	United
10 Sep - 17 Sep	United
03 Sep - 10 Sep	United
15 Sep - 20 Sep	American Airlines
08 Sep - 30 Sep	United
09 Sep - 16 Sep	United
03 Sep - 13 Sep	United
06 Sep - 12 Sep	Delta
12 Sep - 19 Sep	American Airlines
10 Sep - 02 Oct	United
17 Sep - 02 Oct	United
24 Sep - 03 Oct	United
07 Sep - 05 Oct	Frontier Airlines
14 Sep - 10 Oct	Alaska Airlines
07 Sep - 03 Oct	Alaska Airlines
14 Sep - 05 Oct	Alaska Airlines
30 Sep - 06 Oct	Alaska Airlines
30 Sep - 28 Oct	Alaska Airlines
30 Sep - 21 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 $231

Return flights