AirHint found the following cheapest return flights from London (LCY) to Keflavik (KEF) in May 2026 (see full year).

Return flights

04 May - 10 May	Lufthansa
11 May - 25 May	Lufthansa
08 May - 11 May	SWISS
18 May - 24 May	Lufthansa
15 May - 21 May	Lufthansa
18 May - 23 May	Lufthansa
04 May - 08 May	Lufthansa
01 May - 07 May	Lufthansa
25 May - 02 Jun	Lufthansa
15 May - 24 May	Lufthansa
01 May - 04 May	Lufthansa
29 May - 02 Jun	SWISS
22 May - 02 Jun	SWISS
31 May - 04 Jun	Lufthansa
26 May - 02 Jun	KLM
22 May - 01 Jun	Lufthansa
25 May - 07 Jun	KLM
14 May - 05 Jun	KLM
26 May - 03 Jun	KLM

Also check the deals for one-way flights from London to Keflavik 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 Keflavik in May from 324€

Return flights