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

Return flights

25 Aug - 29 Aug	WestJet	direct
25 Aug - 26 Aug	WestJet
22 Aug - 27 Aug	Frontier Airlines
19 Aug - 26 Aug	Frontier Airlines
23 Aug - 31 Aug	United
19 Aug - 26 Aug	United	direct
31 Aug - 05 Sep	Delta
25 Aug - 26 Aug	United	direct
28 Aug - 01 Sep	Allegiant Air
20 Aug - 25 Aug	United	direct
21 Aug - 25 Aug	United	direct
30 Aug - 01 Sep	Allegiant Air
21 Aug - 06 Sep	Air Canada
31 Aug - 02 Sep	United
22 Aug - 27 Aug	Air Canada	direct
29 Aug - 01 Sep	Air Canada	direct
30 Aug - 01 Sep	Air Canada	direct

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 238€

Return flights