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

Return flights

06 May - 13 May	British Airways	direct
08 May - 14 May	Icelandair	direct
15 May - 24 May	Icelandair	direct
08 May - 13 May	Icelandair	direct
09 May - 14 May	Icelandair	direct
24 May - 31 May	Icelandair	direct
10 May - 14 May	Icelandair	direct
24 May - 27 May	Icelandair	direct
25 May - 29 May	Icelandair	direct
16 May - 22 May	Icelandair	direct
19 May - 01 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 166€

Return flights