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

Return flights

30 Sep - 02 Oct	Air Canada
23 Sep - 02 Oct	Air Transat
30 Sep - 25 Oct	Air Canada
29 Sep - 25 Oct	Air Canada
28 Sep - 08 Oct	Air Canada
28 Sep - 07 Oct	WestJet
23 Sep - 01 Oct	Virgin Atlantic
20 Sep - 01 Oct	Delta
23 Sep - 03 Oct	Delta
23 Sep - 07 Oct	Delta
21 Sep - 28 Sep	WestJet
20 Sep - 28 Sep	Flair Airlines
22 Sep - 29 Sep	Finnair
24 Sep - 29 Sep	Air Canada
23 Sep - 29 Sep	Air Canada
21 Sep - 23 Sep	WestJet
23 Sep - 30 Sep	Air Canada
26 Sep - 30 Sep	WestJet
25 Sep - 28 Sep	WestJet
18 Sep - 22 Sep	Air Canada

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 527€

Return flights