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

Return flights

07 Dec - 09 Dec	Scandinavian Airlines
08 Dec - 11 Dec	Scandinavian Airlines
06 Dec - 09 Dec	Wizz Air
27 Dec - 05 Jan	Finnair	direct
08 Dec - 11 Dec	Icelandair	direct
29 Dec - 09 Jan	Icelandair	direct
25 Dec - 01 Jan	Finnair	direct
12 Dec - 15 Dec	Finnair
05 Dec - 09 Dec	Finnair
05 Dec - 08 Dec	Finnair
06 Dec - 08 Dec	Finnair
01 Dec - 08 Dec	easyJet
12 Dec - 15 Dec	Finnair	direct

Also check the deals for one-way flights from Keflavik to Helsinki 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.

Book a cheap hotel in Helsinki

Cheap car rent in Helsinki

Cheapest return flights from Keflavik to Helsinki in December from $255

Return flights