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

Return flights

06 May - 12 May	Ryanair
08 May - 13 May	easyJet
06 May - 13 May	Ryanair
05 May - 12 May	Ryanair
10 May - 13 May	Ryanair
20 May - 27 May	Ryanair
05 May - 09 May	Ryanair
16 May - 19 May	Ryanair
01 May - 06 May	easyJet
18 May - 23 May	Ryanair
29 May - 03 Jun	easyJet
28 May - 11 Jun	Ryanair
24 May - 03 Jun	easyJet
30 May - 04 Jun	Ryanair
30 May - 02 Jun	Ryanair
31 May - 16 Jun	easyJet
31 May - 06 Jun	Ryanair
29 May - 01 Jun	Ryanair
31 May - 13 Jun	easyJet
25 May - 01 Jun	Ryanair

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 169€

Return flights