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

Return flights

09 Apr - 15 Apr	KLM
02 Apr - 08 Apr	KLM
16 Apr - 22 Apr	KLM
15 Apr - 19 Apr	KLM
16 Apr - 19 Apr	KLM
12 Apr - 22 Apr	KLM
12 Apr - 19 Apr	KLM
30 Apr - 04 May	KLM
01 Apr - 05 Apr	KLM
02 Apr - 10 Apr	KLM
02 Apr - 05 Apr	KLM
29 Apr - 04 May	KLM
26 Apr - 03 May	KLM
29 Apr - 03 May	KLM
20 Apr - 03 May	Lufthansa
28 Apr - 03 May	Lufthansa
27 Apr - 05 May	Lufthansa
23 Apr - 03 May	KLM
30 Apr - 05 May	Aer Lingus
25 Apr - 03 May	KLM

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 $274

Return flights