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

Return flights

25 Sep - 28 Sep	WestJet	direct
19 Sep - 22 Sep	WestJet	direct
30 Sep - 11 Oct	WestJet	direct
27 Sep - 05 Oct	WestJet	direct
27 Sep - 01 Oct	WestJet	direct
18 Sep - 23 Sep	WestJet	direct
26 Sep - 30 Sep	WestJet	direct
25 Sep - 27 Sep	WestJet	direct
26 Sep - 28 Sep	WestJet	direct
18 Sep - 20 Sep	WestJet	direct
16 Sep - 22 Sep	WestJet	direct
27 Sep - 30 Sep	WestJet	direct
19 Sep - 27 Sep	WestJet	direct
22 Sep - 04 Oct	WestJet	direct
27 Sep - 02 Oct	WestJet	direct

Also check the deals for one-way flights from London 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 London to Calgary in September from $147

Return flights