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

One-Way flights

13 Dec	airBaltic
01 Dec	Finnair	direct
13 Dec	Finnair	direct
16 Dec	Finnair	direct
12 Dec	Finnair	direct
22 Dec	Finnair	direct
31 Dec	Finnair	direct
25 Dec	Finnair	direct
19 Dec	airBaltic
27 Dec	Finnair	direct

Also check the deals for return flights from Helsinki 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.

Book a cheap hotel in Keflavik

Cheap car rent in Keflavik

Cheapest one-way flights from Helsinki to Keflavik in December from $146

One-Way flights