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

Return flights

13 Oct - 17 Oct	WestJet	direct
03 Oct - 06 Oct	WestJet	direct
07 Oct - 21 Oct	United
21 Oct - 31 Oct	United
07 Oct - 28 Oct	United
07 Oct - 29 Oct	United
21 Oct - 04 Nov	United
22 Oct - 05 Nov	United
10 Oct - 13 Oct	WestJet	direct
13 Oct - 05 Nov	WestJet
07 Oct - 17 Oct	Frontier Airlines
28 Oct - 18 Nov	United
29 Oct - 19 Nov	United
13 Oct - 29 Oct	WestJet
13 Oct - 28 Oct	WestJet
13 Oct - 04 Nov	WestJet
13 Oct - 02 Nov	WestJet

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

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 October from $173

Return flights