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

Return flights

21 Sep - 27 Sep	WestJet
25 Sep - 11 Oct	Air Canada	direct
24 Sep - 11 Oct	Air Canada	direct
10 Sep - 12 Oct	Air Canada
29 Sep - 02 Oct	WestJet	direct
26 Sep - 04 Oct	WestJet	direct
21 Sep - 25 Sep	WestJet	direct
21 Sep - 27 Sep	WestJet	direct
18 Sep - 27 Sep	Flair Airlines
15 Sep - 30 Sep	British Airways
15 Sep - 30 Sep	Lufthansa	direct
19 Sep - 22 Sep	British Airways
10 Sep - 12 Oct	WestJet	direct
18 Sep - 27 Sep	WestJet	direct
19 Sep - 22 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 656€

Return flights