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

Return flights

20 Apr - 29 Apr	Ryanair
24 Apr - 29 Apr	easyJet
20 Apr - 25 Apr	Ryanair
16 Apr - 25 Apr	Ryanair
06 Apr - 11 Apr	Ryanair
16 Apr - 21 Apr	Ryanair
08 Apr - 12 Apr	Ryanair
15 Apr - 22 Apr	Ryanair
19 Apr - 22 Apr	easyJet
23 Apr - 30 Apr	Ryanair
28 Apr - 02 May	easyJet
28 Apr - 06 May	easyJet
27 Apr - 04 May	easyJet
29 Apr - 03 May	easyJet
27 Apr - 05 May	easyJet
27 Apr - 11 May	easyJet
30 Apr - 05 May	Ryanair
30 Apr - 15 May	easyJet
27 Apr - 01 May	easyJet

Also check the deals for one-way flights from London to Keflavik in April.

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 April from $174

Return flights