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

Return flights

23 Apr - 27 Apr	KLM
02 Apr - 08 Apr	KLM
01 Apr - 08 Apr	KLM
22 Apr - 26 Apr	KLM
23 Apr - 26 Apr	KLM
16 Apr - 19 Apr	KLM
16 Apr - 22 Apr	KLM
15 Apr - 24 Apr	KLM
01 Apr - 01 May	KLM
01 Apr - 10 Apr	KLM
17 Apr - 23 Apr	SWISS
29 Apr - 13 May	KLM
29 Apr - 06 May	KLM
26 Apr - 03 May	KLM
29 Apr - 05 May	SWISS
30 Apr - 03 May	KLM
28 Apr - 01 May	KLM
28 Apr - 07 May	KLM
25 Apr - 02 May	KLM
27 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 248€

Return flights