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

Return flights

02 Dec - 10 Dec	United
24 Dec - 14 Jan	United
10 Dec - 31 Dec	United
11 Dec - 02 Jan	Delta
09 Dec - 30 Dec	United
23 Dec - 13 Jan	Allegiant Air
27 Dec - 03 Jan	Delta
20 Dec - 28 Dec	Delta
20 Dec - 26 Dec	Frontier Airlines

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

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 December from $268

Return flights