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

Return flights

17 Apr - 22 Apr	easyJet
22 Apr - 29 Apr	Ryanair
22 Apr - 28 Apr	Ryanair
01 Apr - 04 Apr	Jet2
17 Apr - 26 Apr	Ryanair
10 Apr - 15 Apr	easyJet
12 Apr - 18 Apr	Ryanair
04 Apr - 11 Apr	Ryanair
26 Apr - 03 May	Ryanair
23 Apr - 25 Apr	easyJet
10 Apr - 26 Apr	Ryanair
30 Apr - 06 May	Ryanair
29 Apr - 04 May	easyJet
25 Apr - 04 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 $221

Return flights