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	Virgin Atlantic
20 May - 24 May	Virgin Atlantic
06 May - 20 May	KLM
06 May - 20 May	WestJet	direct
14 May - 18 May	KLM
07 May - 11 May	KLM
07 May - 18 May	WestJet	direct
19 May - 26 May	Delta
12 May - 26 May	Air France
10 May - 23 May	Air France
11 May - 02 Jun	WestJet	direct
21 May - 06 Jun	WestJet	direct
22 May - 04 Jun	WestJet	direct
30 May - 13 Jun	WestJet	direct
19 May - 08 Jun	WestJet	direct
19 May - 09 Jun	WestJet	direct
25 May - 09 Jun	WestJet	direct
13 May - 08 Jun	WestJet	direct
13 May - 08 Jun	Air Canada
18 May - 18 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 512€

Return flights