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

Return flights

27 Jul - 07 Aug	WestJet
30 Jul - 07 Aug	Air Canada
31 Jul - 07 Aug	Air Transat
31 Jul - 11 Aug	British Airways
28 Jul - 01 Aug	Air Canada
27 Jul - 06 Aug	WestJet
30 Jul - 06 Aug	Air Canada
28 Jul - 07 Aug	Air Transat
27 Jul - 31 Jul	Air Canada
30 Jul - 10 Aug	Air Canada
28 Jul - 06 Aug	Porter Airlines (Canada) Ltd
27 Jul - 30 Jul	WestJet
27 Jul - 31 Jul	Air Canada	direct

Also check the deals for one-way flights from Calgary to London in July.

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 July from 744€

Return flights