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

Return flights

20 May - 13 Jun	WestJet
19 May - 02 Jun	Lufthansa
01 May - 05 May	Lufthansa
01 May - 06 May	Lufthansa
20 May - 13 Jun	WestJet	direct
05 May - 19 May	Air Canada
25 May - 01 Jun	Air Canada
18 May - 31 May	Air Canada
06 May - 10 May	Air Canada
19 May - 29 May	Air Canada
02 May - 23 May	Air Canada
01 May - 10 May	Air Canada
01 May - 18 May	Air Canada
07 May - 12 May	Air Canada
30 May - 08 Jun	Air Canada	direct
19 May - 02 Jun	WestJet	direct
24 May - 13 Jun	WestJet	direct
25 May - 01 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 $616

Return flights