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

Return flights

10 Mar - 13 Mar	KLM
09 Mar - 13 Mar	KLM
09 Mar - 12 Mar	KLM
07 Mar - 12 Mar	KLM
02 Mar - 06 Mar	KLM
07 Mar - 13 Mar	KLM
02 Mar - 10 Mar	KLM
18 Mar - 24 Mar	KLM
11 Mar - 15 Mar	KLM
03 Mar - 10 Mar	KLM
24 Mar - 02 Apr	SWISS
30 Mar - 02 Apr	KLM
28 Mar - 14 Apr	KLM
29 Mar - 03 Apr	KLM
28 Mar - 08 Apr	KLM
28 Mar - 06 Apr	KLM
27 Mar - 05 Apr	KLM
30 Mar - 04 Apr	SWISS

Also check the deals for one-way flights from London to Keflavik in March.

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 March from 231€

Return flights