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

Return flights

16 Sep - 06 Oct	British Airways
25 Sep - 07 Oct	Vueling Airlines
22 Sep - 06 Oct	Air France
26 Sep - 06 Oct	Vueling Airlines
20 Sep - 08 Oct	British Airways
27 Sep - 07 Oct	Air France
26 Sep - 07 Oct	Aer Lingus
16 Sep - 23 Sep	British Airways
08 Sep - 19 Sep	Vueling Airlines
30 Sep - 13 Oct	WestJet
30 Sep - 07 Oct	WestJet
24 Sep - 27 Sep	Aer Lingus
10 Sep - 22 Sep	TAP
10 Sep - 24 Sep	TAP
09 Sep - 23 Sep	Vueling Airlines
09 Sep - 28 Sep	Vueling Airlines
16 Sep - 28 Sep	Vueling Airlines
23 Sep - 30 Sep	Vueling Airlines
30 Sep - 19 Oct	WestJet
11 Sep - 15 Sep	Air Canada

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 403€

Return flights