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

Return flights

05 Dec - 10 Dec	easyJet
06 Dec - 10 Dec	easyJet
06 Dec - 12 Dec	easyJet
05 Dec - 09 Dec	easyJet
06 Dec - 09 Dec	easyJet
08 Dec - 12 Dec	Wizz Air
08 Dec - 15 Dec	Jet2
26 Dec - 25 Jan	Wizz Air
27 Dec - 06 Jan	SWISS
15 Dec - 23 Dec	easyJet
13 Dec - 29 Dec	easyJet
28 Dec - 04 Jan	TUI
18 Dec - 30 Dec	easyJet
23 Dec - 04 Jan	Scandinavian Airlines
22 Dec - 04 Jan	Wizz Air Malta
24 Dec - 04 Jan	Scandinavian Airlines
18 Dec - 04 Jan	easyJet
19 Dec - 04 Jan	Wizz Air Malta
19 Dec - 03 Jan	Wizz Air Malta
22 Dec - 02 Jan	Wizz Air Malta

Also check the deals for one-way flights from Keflavik to Barcelona 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 Barcelona in December from $244

Return flights