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

Return flights

28 Aug - 28 Sep	Scandinavian Airlines
28 Aug - 14 Sep	Scandinavian Airlines
28 Aug - 07 Sep	Scandinavian Airlines
28 Aug - 03 Sep	Icelandair
20 Aug - 06 Sep	SWISS
19 Aug - 02 Sep	Lufthansa
28 Aug - 09 Sep	Scandinavian Airlines
28 Aug - 20 Sep	Scandinavian Airlines
21 Aug - 25 Aug	SWISS
20 Aug - 16 Sep	SWISS
21 Aug - 26 Aug	SWISS
21 Aug - 07 Sep	SWISS
19 Aug - 25 Aug	Lufthansa
28 Aug - 31 Aug	Scandinavian Airlines
22 Aug - 27 Aug	Icelandair
18 Aug - 29 Aug	Finnair
19 Aug - 24 Aug	Lufthansa
21 Aug - 24 Aug	SWISS
22 Aug - 26 Aug	Icelandair
20 Aug - 25 Aug	Icelandair

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 505€

Return flights