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

Return flights

17 Sep - 06 Oct	WestJet	direct
19 Sep - 04 Oct	WestJet	direct
25 Sep - 04 Oct	WestJet	direct
19 Sep - 03 Oct	WestJet	direct
25 Sep - 03 Oct	WestJet	direct
16 Sep - 06 Oct	WestJet	direct
17 Sep - 03 Oct	WestJet	direct
20 Sep - 04 Oct	WestJet	direct
23 Sep - 03 Oct	WestJet	direct
18 Sep - 04 Oct	WestJet	direct
19 Sep - 20 Sep	Air Canada
18 Sep - 30 Sep	WestJet	direct
06 Sep - 11 Sep	WestJet
17 Sep - 27 Sep	WestJet
07 Sep - 18 Sep	Eurowings
18 Sep - 27 Sep	WestJet
26 Sep - 29 Sep	Aer Lingus
13 Sep - 23 Sep	Vueling Airlines
18 Sep - 28 Sep	WestJet
10 Sep - 19 Sep	Icelandair

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.

Book a cheap hotel in Calgary

Cheap car rent in Calgary

Cheapest return flights from London to Calgary in September from 388€

Return flights