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

Return flights

12 Aug - 26 Aug	WestJet
27 Aug - 03 Sep	WestJet
22 Aug - 01 Sep	WestJet
29 Aug - 15 Sep	WestJet
29 Aug - 04 Sep	WestJet
13 Aug - 18 Aug	WestJet
03 Aug - 21 Aug	WestJet
27 Aug - 04 Sep	WestJet
28 Aug - 18 Sep	WestJet
13 Aug - 15 Sep	WestJet
06 Aug - 10 Aug	WestJet
07 Aug - 10 Aug	WestJet
07 Aug - 20 Aug	WestJet
15 Aug - 29 Aug	WestJet
05 Aug - 08 Aug	WestJet
07 Aug - 22 Aug	WestJet
02 Aug - 07 Sep	WestJet
07 Aug - 11 Aug	Flair Airlines

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 $654

Return flights