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

Return flights

08 May - 23 May	KLM
18 May - 25 May	KLM
18 May - 08 Jun	KLM
21 May - 26 May	KLM
20 May - 24 May	Delta
09 May - 16 May	Delta
04 May - 10 May	British Airways
11 May - 18 May	British Airways
20 May - 03 Jun	British Airways
20 May - 27 May	Iberia
06 May - 27 May	Iberia
17 May - 04 Jun	Iberia
20 May - 24 May	WestJet	direct
20 May - 03 Jun	WestJet	direct
30 May - 03 Jun	British Airways
18 May - 08 Jun	WestJet	direct
28 May - 03 Jun	Iberia
30 May - 10 Jun	WestJet	direct
23 May - 07 Jun	WestJet	direct
23 May - 03 Jun	WestJet	direct

Also check the deals for one-way flights from London to Calgary 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 London to Calgary in May from $763

Return flights