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

Return flights

06 Dec - 12 Dec	Ryanair
08 Dec - 15 Dec	easyJet
01 Dec - 07 Dec	Ryanair
07 Dec - 12 Dec	Ryanair
03 Dec - 05 Dec	easyJet
14 Dec - 18 Dec	Ryanair
05 Dec - 13 Dec	Ryanair
13 Dec - 20 Dec	Ryanair
20 Dec - 27 Dec	Ryanair
11 Dec - 15 Dec	Ryanair
22 Dec - 05 Jan	Ryanair
31 Dec - 06 Jan	LOT
27 Dec - 06 Jan	Ryanair
19 Dec - 05 Jan	easyJet
27 Dec - 05 Jan	Ryanair
27 Dec - 01 Jan	Ryanair
30 Dec - 05 Jan	Ryanair
24 Dec - 01 Jan	LOT
31 Dec - 06 Jan	Icelandair	direct
31 Dec - 07 Jan	Icelandair	direct

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 170€

Return flights