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

Return flights

23 May - 31 May	Icelandair	direct
02 May - 10 May	Icelandair	direct
12 May - 17 May	Icelandair	direct
03 May - 13 May	Icelandair	direct
05 May - 13 May	Icelandair	direct
19 May - 23 May	Icelandair	direct
13 May - 17 May	Icelandair	direct
27 May - 31 May	Icelandair	direct
03 May - 10 May	Icelandair	direct
13 May - 26 May	Icelandair	direct
23 May - 07 Jun	Icelandair	direct
29 May - 07 Jun	Icelandair	direct

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 149€

Return flights