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

Return flights

03 Mar - 10 Mar	easyJet
07 Mar - 10 Mar	Ryanair
09 Mar - 12 Mar	Ryanair
07 Mar - 12 Mar	Ryanair
11 Mar - 17 Mar	Ryanair
04 Mar - 08 Mar	Ryanair
05 Mar - 10 Mar	Ryanair
14 Mar - 17 Mar	Ryanair
13 Mar - 17 Mar	Ryanair
14 Mar - 18 Mar	Ryanair
21 Mar - 04 Apr	Ryanair
28 Mar - 11 Apr	Ryanair
30 Mar - 07 Apr	Ryanair
30 Mar - 06 Apr	Ryanair
31 Mar - 09 Apr	Ryanair
31 Mar - 08 Apr	Ryanair
28 Mar - 07 Apr	Ryanair
30 Mar - 04 Apr	Ryanair
28 Mar - 05 Apr	Ryanair
27 Mar - 05 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 158€

Return flights