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
22 Aug - 26 Aug	WestJet
22 Aug - 27 Aug	WestJet	direct
02 Aug - 06 Aug	Allegiant Air
22 Aug - 25 Aug	WestJet
18 Aug - 25 Aug	WestJet
22 Aug - 28 Aug	WestJet
21 Aug - 27 Aug	Allegiant Air
30 Aug - 03 Sep	Frontier Airlines
22 Aug - 24 Aug	WestJet
30 Aug - 04 Sep	Frontier Airlines
14 Aug - 20 Aug	Allegiant Air
27 Aug - 01 Sep	WestJet
25 Aug - 01 Sep	WestJet
28 Aug - 01 Sep	Allegiant Air
28 Aug - 04 Sep	United
28 Aug - 02 Sep	Allegiant Air
29 Aug - 05 Sep	WestJet	direct
30 Aug - 01 Sep	Frontier Airlines
29 Aug - 01 Sep	WestJet

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 $206

Return flights