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

Return flights

28 Jul - 31 Jul	Frontier Airlines
31 Jul - 07 Aug	Allegiant Air
28 Jul - 31 Jul	United	direct
30 Jul - 13 Aug	Frontier Airlines
24 Jul - 30 Jul	Allegiant Air
31 Jul - 05 Aug	Allegiant Air
30 Jul - 05 Aug	Frontier Airlines
18 Jul - 23 Jul	WestJet
22 Jul - 28 Jul	United
19 Jul - 26 Jul	Allegiant Air
29 Jul - 03 Aug	Frontier Airlines
24 Jul - 28 Jul	Allegiant Air
25 Jul - 28 Jul	Allegiant Air
25 Jul - 27 Jul	Allegiant Air
16 Jul - 22 Jul	American Airlines
29 Jul - 03 Aug	Air Canada	direct

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

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 July from $340

Return flights