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

Return flights

22 Aug - 27 Aug	WestJet
22 Aug - 10 Sep	WestJet
28 Aug - 14 Sep	Flair Airlines
21 Aug - 26 Aug	Air Canada
27 Aug - 09 Sep	WestJet
25 Aug - 31 Aug	Air Canada
19 Aug - 31 Aug	WestJet
27 Aug - 01 Sep	WestJet
11 Aug - 18 Aug	WestJet
23 Aug - 01 Sep	Air Canada
13 Aug - 20 Aug	WestJet
06 Aug - 11 Aug	WestJet
23 Aug - 27 Aug	Air Canada
14 Aug - 27 Aug	Air Canada
05 Aug - 19 Aug	Finnair
11 Aug - 09 Sep	WestJet
31 Aug - 21 Sep	Air Canada
19 Aug - 02 Sep	Finnair
27 Aug - 03 Sep	WestJet	direct
27 Aug - 04 Sep	WestJet	direct

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.

Book a cheap hotel in London

Cheap car rent in London

Cheapest return flights from Calgary to London in August from 589€

Return flights