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

Return flights

29 Aug - 05 Sep	Aer Lingus
27 Aug - 05 Sep	Delta
31 Aug - 07 Sep	Delta
05 Aug - 18 Aug	Delta
05 Aug - 19 Aug	Delta
21 Aug - 03 Sep	Delta
31 Aug - 20 Sep	Delta
25 Aug - 05 Sep	Delta
25 Aug - 04 Sep	Delta
18 Aug - 03 Sep	Delta
26 Aug - 09 Sep	Icelandair
27 Aug - 07 Sep	Delta
14 Aug - 17 Aug	Delta
15 Aug - 19 Aug	Delta
03 Aug - 11 Aug	Delta
12 Aug - 19 Aug	Delta
18 Aug - 27 Aug	Scandinavian Airlines
13 Aug - 20 Aug	Air France
08 Aug - 11 Aug	Delta
03 Aug - 18 Aug	Delta

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 $754

Return flights