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

Return flights

01 Dec - 05 Dec	Ryanair
12 Dec - 15 Dec	easyJet
22 Dec - 26 Dec	easyJet
06 Dec - 12 Dec	easyJet
05 Dec - 12 Dec	Lufthansa
12 Dec - 18 Dec	easyJet
13 Dec - 19 Dec	easyJet
23 Dec - 27 Dec	easyJet
05 Dec - 13 Dec	easyJet
30 Dec - 04 Jan	SWISS
05 Dec - 13 Dec	Icelandair	direct
29 Dec - 02 Jan	easyJet

Also check the deals for one-way flights from Prague 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 Prague to Keflavik in December from 174€

Return flights