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

Return flights

09 Apr - 13 Apr	KLM
16 Apr - 22 Apr	KLM
30 Apr - 10 May	KLM
30 Apr - 06 May	KLM
09 Apr - 10 May	KLM
16 Apr - 20 Apr	KLM
29 Apr - 06 May	KLM
09 Apr - 16 Apr	KLM
09 Apr - 19 Apr	KLM
16 Apr - 19 Apr	KLM
22 Apr - 27 Apr	KLM
30 Apr - 04 May	KLM
05 Apr - 19 Apr	KLM
12 Apr - 15 Apr	KLM
09 Apr - 12 Apr	KLM
28 Apr - 04 May	KLM
30 Apr - 03 May	KLM
26 Apr - 03 May	KLM
28 Apr - 03 May	KLM
25 Apr - 02 May	SWISS

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 251€

Return flights