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

Return flights

17 Oct - 29 Oct	WestJet
17 Oct - 22 Oct	WestJet
03 Oct - 06 Oct	WestJet
22 Oct - 29 Oct	Frontier Airlines
03 Oct - 05 Oct	WestJet
03 Oct - 10 Oct	WestJet
03 Oct - 12 Oct	WestJet
31 Oct - 09 Nov	Frontier Airlines
22 Oct - 26 Oct	Frontier Airlines
07 Oct - 08 Oct	Air Canada
11 Oct - 15 Oct	Frontier Airlines
30 Oct - 06 Nov	Frontier Airlines
31 Oct - 07 Nov	United

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 170€

Return flights