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

Return flights

03 Mar - 11 Mar	Fly Play	direct
05 Mar - 11 Mar	Fly Play	direct
08 Mar - 11 Mar	Fly Play	direct
10 Mar - 17 Mar	Fly Play	direct
19 Mar - 23 Mar	Fly Play	direct
15 Mar - 20 Mar	Fly Play	direct
01 Mar - 14 Mar	Fly Play	direct
02 Mar - 14 Mar	Fly Play	direct
19 Mar - 22 Mar	Fly Play	direct
02 Mar - 17 Mar	Fly Play	direct
27 Mar - 08 Apr	Fly Play
30 Mar - 02 Apr	Ryanair
29 Mar - 02 Apr	Ryanair

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 101€

Return flights