AirHint found the following cheapest return flights from Calgary (YYC) to London (LHR) in May 2026 (see full year).

Return flights

02 May - 20 May	Air France
08 May - 16 May	KLM
07 May - 30 May	KLM
07 May - 29 May	KLM
22 May - 26 May	KLM
14 May - 18 May	KLM
11 May - 18 May	KLM
11 May - 25 May	KLM
07 May - 14 May	Delta
07 May - 29 May	WestJet	direct
11 May - 04 Jun	Flair Airlines
11 May - 10 Jun	Flair Airlines
20 May - 03 Jun	American Airlines
14 May - 03 Jun	British Airways
11 May - 06 Jun	British Airways
27 May - 10 Jun	British Airways
14 May - 04 Jun	British Airways
24 May - 03 Jun	WestJet
19 May - 16 Jun	KLM
20 May - 03 Jun	WestJet	direct

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

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 May from $627

Return flights