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

Return flights

11 Aug - 18 Aug	Air Canada
13 Aug - 20 Aug	Air Canada
27 Aug - 03 Sep	Delta
30 Aug - 06 Sep	Frontier Airlines
31 Aug - 06 Sep	Delta
31 Aug - 09 Sep	Delta
31 Aug - 07 Sep	Frontier Airlines
07 Aug - 14 Aug	Air Canada
19 Aug - 26 Aug	Frontier Airlines
23 Aug - 30 Aug	Frontier Airlines
16 Aug - 23 Aug	Frontier Airlines
20 Aug - 25 Aug	Frontier Airlines
23 Aug - 31 Aug	Frontier Airlines
06 Aug - 13 Aug	United
22 Aug - 27 Aug	United
28 Aug - 04 Sep	Hawaiian Airlines
26 Aug - 02 Sep	Hawaiian Airlines
25 Aug - 01 Sep	Delta
29 Aug - 05 Sep	Frontier Airlines
28 Aug - 01 Sep	Frontier Airlines

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

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 August from 249€

Return flights