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

Return flights

10 May - 29 May	Delta
18 May - 26 May	Delta
22 May - 26 May	KLM
01 May - 15 May	Air France
05 May - 12 May	KLM
01 May - 04 May	KLM
06 May - 24 May	Air France
01 May - 29 May	Air France
08 May - 16 May	KLM
08 May - 15 May	KLM
29 May - 09 Jun	WestJet	direct
28 May - 03 Jun	WestJet	direct
29 May - 05 Jun	WestJet	direct
11 May - 02 Jun	WestJet	direct
29 May - 03 Jun	WestJet	direct
20 May - 03 Jun	WestJet
27 May - 10 Jun	WestJet	direct
28 May - 13 Jun	WestJet
24 May - 03 Jun	WestJet	direct
27 May - 24 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 $632

Return flights