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

Return flights

10 Mar - 17 Mar	KLM
10 Mar - 19 Mar	KLM
10 Mar - 18 Mar	KLM
17 Mar - 26 Mar	KLM
02 Mar - 10 Mar	KLM
18 Mar - 25 Mar	KLM
31 Mar - 05 Apr	KLM
18 Mar - 24 Mar	KLM
02 Mar - 06 Mar	KLM
03 Mar - 06 Mar	KLM
24 Mar - 29 Mar	KLM
25 Mar - 01 Apr	KLM
17 Mar - 06 Apr	KLM
31 Mar - 06 Apr	KLM
25 Mar - 05 Apr	KLM
31 Mar - 01 Apr	KLM
29 Mar - 03 Apr	KLM
30 Mar - 02 Apr	Aer Lingus
26 Mar - 02 Apr	Aer Lingus
27 Mar - 02 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 $273

Return flights