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

Return flights

24 Apr - 29 Apr	Ryanair
15 Apr - 22 Apr	Ryanair
22 Apr - 25 Apr	Ryanair
29 Apr - 06 May	easyJet
24 Apr - 30 Apr	Ryanair
17 Apr - 21 Apr	easyJet
01 Apr - 11 Apr	Jet2
10 Apr - 14 Apr	Ryanair
24 Apr - 26 Apr	Ryanair
01 Apr - 08 Apr	Jet2
08 Apr - 12 Apr	Ryanair
30 Apr - 06 May	easyJet
29 Apr - 05 May	easyJet
30 Apr - 05 May	easyJet
28 Apr - 04 May	Ryanair
26 Apr - 02 May	Ryanair
29 Apr - 03 May	easyJet
25 Apr - 02 May	Ryanair
27 Apr - 03 May	easyJet
25 Apr - 01 May	Ryanair

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 $186

Return flights