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

Return flights

08 Dec - 15 Dec	easyJet
01 Dec - 08 Dec	Ryanair
10 Dec - 17 Dec	Ryanair
09 Dec - 16 Dec	Ryanair
11 Dec - 14 Dec	Ryanair
04 Dec - 07 Dec	Ryanair
03 Dec - 07 Dec	Ryanair
04 Dec - 08 Dec	Ryanair
13 Dec - 16 Dec	Ryanair
09 Dec - 15 Dec	easyJet
29 Dec - 02 Jan	Ryanair
29 Dec - 03 Jan	easyJet
28 Dec - 03 Jan	easyJet
30 Dec - 03 Jan	easyJet
27 Dec - 03 Jan	Ryanair
28 Dec - 02 Jan	Ryanair
31 Dec - 03 Jan	easyJet

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

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 December from 166€

Return flights