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

Return flights

26 Aug - 10 Sep	KLM
06 Aug - 23 Aug	Finnair
06 Aug - 21 Aug	Finnair
06 Aug - 20 Aug	Finnair
22 Aug - 12 Sep	Finnair
22 Aug - 04 Sep	Finnair
26 Aug - 15 Sep	Icelandair
25 Aug - 05 Sep	KLM
29 Aug - 29 Sep	KLM
29 Aug - 19 Sep	KLM
28 Aug - 09 Sep	Lufthansa
26 Aug - 18 Sep	KLM
29 Aug - 10 Sep	Aer Lingus
06 Aug - 22 Aug	Finnair
19 Aug - 25 Aug	Icelandair
11 Aug - 18 Aug	KLM
07 Aug - 12 Aug	KLM
07 Aug - 13 Aug	KLM
10 Aug - 18 Aug	KLM
13 Aug - 20 Aug	KLM

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

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 London to Calgary in August from 611€

Return flights