AirHint found the following cheapest return flights from Houston (IAH) to Calgary (YYC) in September 2025 (see full year).

Return flights

23 Sep - 30 Sep	WestJet	direct
23 Sep - 27 Sep	WestJet	direct
22 Sep - 28 Sep	WestJet	direct
20 Sep - 22 Sep	WestJet	direct
20 Sep - 25 Sep	WestJet	direct
24 Sep - 28 Sep	WestJet	direct
14 Sep - 18 Sep	WestJet	direct
15 Sep - 19 Sep	WestJet	direct
25 Sep - 29 Sep	Spirit Airlines
18 Sep - 23 Sep	Frontier Airlines

Also check the deals for one-way flights from Houston to Calgary in September.

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 Houston to Calgary in September from $172

Return flights