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

Return flights

31 Dec - 10 Jan	LOT
31 Dec - 08 Jan	LOT
24 Dec - 10 Jan	LOT
26 Dec - 08 Jan	LOT
30 Dec - 08 Jan	Ryanair
29 Dec - 04 Jan	Wizz Air Malta
30 Dec - 01 Jan	LOT
26 Dec - 11 Jan	Ryanair
25 Dec - 28 Dec	LOT
31 Dec - 04 Jan	LOT
24 Dec - 02 Jan	LOT
26 Dec - 28 Dec	Lufthansa
25 Dec - 30 Dec	LOT
27 Dec - 29 Dec	LOT
26 Dec - 30 Dec	LOT
25 Dec - 27 Dec	LOT
26 Dec - 31 Dec	LOT
27 Dec - 30 Dec	LOT
28 Dec - 31 Dec	Ryanair
27 Dec - 31 Dec	easyJet

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 $428

Return flights