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

Return flights

20 May - 27 May	Air Canada
11 May - 27 May	WestJet
05 May - 18 May	WestJet
29 May - 11 Jun	WestJet	direct
17 May - 27 May	WestJet
10 May - 18 May	WestJet
02 May - 20 May	WestJet
12 May - 28 May	WestJet	direct
15 May - 24 May	WestJet
11 May - 25 May	Air Canada
04 May - 11 May	WestJet	direct
24 May - 03 Jun	WestJet
19 May - 09 Jun	WestJet
12 May - 02 Jun	WestJet	direct
29 May - 03 Jun	WestJet	direct
28 May - 03 Jun	WestJet	direct
29 May - 05 Jun	WestJet	direct
29 May - 02 Jun	WestJet	direct
11 May - 02 Jun	WestJet	direct
28 May - 06 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 576€

Return flights