AirHint found the following cheapest return flights from Calgary (YYC) to London (LHR) in September 2026 (see full year).

Return flights

30 Sep - 10 Oct	Air Canada
30 Sep - 10 Oct	Air Canada	direct
13 Sep - 20 Sep	Flair Airlines
03 Sep - 17 Sep	Flair Airlines
26 Sep - 04 Oct	Air Canada
26 Sep - 04 Oct	WestJet	direct
03 Sep - 17 Sep	WestJet	direct
08 Sep - 15 Sep	WestJet	direct
11 Sep - 25 Sep	WestJet	direct
13 Sep - 20 Sep	WestJet	direct
03 Sep - 07 Sep	WestJet	direct

Also check the deals for one-way flights from Calgary to London 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 Calgary to London in September from 586€

Return flights