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

Return flights

15 Dec - 23 Dec	Ryanair
06 Dec - 12 Dec	Ryanair
15 Dec - 29 Dec	Ryanair
03 Dec - 10 Dec	Ryanair
02 Dec - 09 Dec	Ryanair
12 Dec - 15 Dec	Wizz Air Malta
06 Dec - 10 Dec	Ryanair
13 Dec - 17 Dec	Ryanair
13 Dec - 18 Dec	Ryanair
09 Dec - 12 Dec	easyJet
17 Dec - 11 Jan	easyJet
30 Dec - 12 Jan	Scandinavian Airlines
20 Dec - 10 Jan	Ryanair
17 Dec - 11 Jan	Icelandair	direct
17 Dec - 01 Jan	LOT
26 Dec - 09 Jan	Condor
31 Dec - 06 Jan	LOT
17 Dec - 01 Jan	Icelandair	direct
14 Dec - 02 Jan	Ryanair
23 Dec - 04 Jan	Ryanair

Also check the deals for one-way flights from Frankfurt 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 Frankfurt to Keflavik in December from 224€

Return flights