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

Return flights

11 Oct - 01 Nov	WestJet	direct
30 Oct - 09 Nov	WestJet	direct
26 Oct - 08 Nov	WestJet	direct
26 Oct - 09 Nov	WestJet	direct
28 Oct - 22 Nov	Air Canada
07 Oct - 01 Nov	WestJet
25 Oct - 15 Nov	Air Canada
28 Oct - 22 Nov	WestJet	direct
22 Oct - 15 Nov	Air Canada
14 Oct - 29 Nov	WestJet
22 Oct - 30 Oct	Air Canada
14 Oct - 22 Oct	WestJet
22 Oct - 24 Oct	WestJet	direct
10 Oct - 22 Oct	WestJet
07 Oct - 14 Oct	WestJet
04 Oct - 25 Oct	Air Canada
05 Oct - 25 Oct	Air Canada
03 Oct - 25 Oct	Air Canada
01 Oct - 25 Oct	Air Canada
09 Oct - 28 Oct	Aegean Airlines

Also check the deals for one-way flights from Calgary to London in October.

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 October from $456

Return flights