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

Return flights

25 Mar - 30 Mar	Ryanair
17 Mar - 19 Mar	easyJet
25 Mar - 31 Mar	Ryanair
16 Mar - 18 Mar	Ryanair
10 Mar - 17 Mar	easyJet
24 Mar - 26 Mar	easyJet
10 Mar - 19 Mar	easyJet
16 Mar - 19 Mar	Ryanair
10 Mar - 21 Mar	Ryanair
03 Mar - 10 Mar	easyJet
25 Mar - 01 Apr	Ryanair
26 Mar - 04 Apr	Ryanair
21 Mar - 04 Apr	Ryanair
28 Mar - 04 Apr	Ryanair
31 Mar - 08 Apr	Ryanair
30 Mar - 02 Apr	Ryanair
26 Mar - 07 Apr	Ryanair
28 Mar - 02 Apr	Ryanair
30 Mar - 04 Apr	Ryanair
31 Mar - 04 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 116€

Return flights