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

Return flights

23 Oct - 01 Nov	Air Canada
19 Oct - 01 Nov	Air Canada
28 Oct - 11 Nov	KLM
17 Oct - 08 Nov	Virgin Atlantic
30 Oct - 22 Nov	Air France
29 Oct - 22 Nov	KLM
23 Oct - 30 Oct	Delta
28 Oct - 22 Nov	Air France
23 Oct - 03 Nov	Delta
27 Oct - 10 Nov	KLM
29 Oct - 14 Nov	Virgin Atlantic
22 Oct - 29 Oct	Virgin Atlantic
16 Oct - 24 Oct	Air Canada
24 Oct - 31 Oct	Virgin Atlantic
22 Oct - 27 Oct	KLM
27 Oct - 31 Oct	KLM
23 Oct - 28 Oct	KLM
18 Oct - 27 Oct	KLM
17 Oct - 25 Oct	Delta
18 Oct - 25 Oct	Delta

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 499€

Return flights