AirHint found the following cheapest return flights from London (STN) to Keflavik (KEF) in December 2025 (see full year).

Return flights

15 Dec - 15 Jan	Ryanair
31 Dec - 08 Jan	easyJet
15 Dec - 13 Jan	Ryanair
01 Dec - 05 Dec	Ryanair
31 Dec - 11 Jan	Ryanair
06 Dec - 08 Dec	Ryanair
16 Dec - 08 Jan	easyJet
01 Dec - 04 Dec	Ryanair
12 Dec - 12 Jan	Ryanair
01 Dec - 06 Dec	Ryanair
09 Dec - 30 Dec	easyJet
31 Dec - 13 Jan	Ryanair
04 Dec - 13 Jan	Ryanair
02 Dec - 04 Dec	Ryanair
31 Dec - 10 Jan	Ryanair
17 Dec - 11 Jan	Ryanair
06 Dec - 07 Dec	Ryanair
04 Dec - 06 Dec	Ryanair
03 Dec - 06 Dec	Ryanair
01 Dec - 07 Dec	Ryanair

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 149€

Return flights