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

Return flights

20 Aug - 27 Aug	WestJet
09 Aug - 28 Aug	WestJet
20 Aug - 10 Sep	WestJet
12 Aug - 19 Aug	WestJet
26 Aug - 16 Sep	Porter Airlines (Canada) Ltd
05 Aug - 27 Aug	Porter Airlines (Canada) Ltd
19 Aug - 26 Aug	WestJet
12 Aug - 22 Aug	WestJet
27 Aug - 08 Sep	Virgin Atlantic
27 Aug - 17 Sep	Virgin Atlantic
26 Aug - 05 Sep	Delta
22 Aug - 04 Sep	WestJet
08 Aug - 22 Aug	WestJet
19 Aug - 06 Sep	WestJet
25 Aug - 07 Sep	Delta
27 Aug - 04 Sep	Virgin Atlantic
24 Aug - 09 Sep	Delta
24 Aug - 31 Aug	Delta
21 Aug - 28 Aug	WestJet
13 Aug - 28 Aug	WestJet

Also check the deals for one-way flights from Calgary to London 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 Calgary to London in August from $694

Return flights