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

Return flights

05 Dec - 07 Dec	Ryanair
05 Dec - 08 Dec	Ryanair
09 Dec - 19 Jan	easyJet
31 Dec - 11 Jan	Ryanair
09 Dec - 16 Dec	easyJet
17 Dec - 23 Dec	Ryanair
06 Dec - 11 Dec	Ryanair
01 Dec - 06 Dec	Ryanair
07 Dec - 10 Dec	Ryanair
15 Dec - 16 Dec	Ryanair
07 Dec - 12 Dec	Ryanair
03 Dec - 06 Dec	Ryanair
31 Dec - 07 Jan	Ryanair
27 Dec - 08 Jan	Ryanair
14 Dec - 04 Jan	Ryanair
29 Dec - 31 Jan	Ryanair
26 Dec - 04 Jan	Ryanair
10 Dec - 09 Jan	easyJet
27 Dec - 10 Jan	Ryanair
23 Dec - 10 Jan	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 $227

Return flights