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

Return flights

09 Dec - 17 Dec	easyJet
15 Dec - 12 Jan	easyJet
23 Dec - 13 Jan	Lufthansa
05 Dec - 13 Dec	easyJet
12 Dec - 19 Dec	easyJet
05 Dec - 10 Dec	easyJet
01 Dec - 06 Dec	easyJet
28 Dec - 06 Jan	LOT
08 Dec - 13 Dec	Wizz Air
12 Dec - 15 Dec	Lufthansa
08 Dec - 12 Dec	Scandinavian Airlines
13 Dec - 18 Dec	easyJet
23 Dec - 01 Jan	Lufthansa
12 Dec - 02 Jan	Lufthansa
05 Dec - 12 Dec	Scandinavian Airlines
08 Dec - 05 Jan	Wizz Air
22 Dec - 02 Jan	Transavia France
23 Dec - 03 Jan	Lufthansa
08 Dec - 05 Jan	Icelandair	direct
22 Dec - 02 Jan	Icelandair	direct

Also check the deals for one-way flights from Keflavik to Prague 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 Keflavik to Prague in December from 186€

Return flights