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

Return flights

05 Dec - 09 Dec	Lufthansa
05 Dec - 13 Dec	Lufthansa
05 Dec - 11 Dec	Lufthansa
06 Dec - 13 Dec	Lufthansa
31 Dec - 08 Jan	Lufthansa
07 Dec - 13 Dec	Frontier Airlines
11 Dec - 13 Dec	Lufthansa
07 Dec - 14 Dec	jetBlue
30 Dec - 08 Jan	Icelandair	direct
31 Dec - 08 Jan	Icelandair	direct
11 Dec - 18 Dec	Spirit Airlines
05 Dec - 17 Dec	Lufthansa
10 Dec - 14 Dec	Scandinavian Airlines
31 Dec - 07 Jan	Icelandair	direct
30 Dec - 05 Jan	Icelandair
29 Dec - 06 Jan	Scandinavian Airlines
31 Dec - 04 Jan	Icelandair
30 Dec - 04 Jan	Icelandair
23 Dec - 10 Jan	Frontier Airlines
29 Dec - 02 Jan	Icelandair	direct

Also check the deals for one-way flights from New York 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 return flights from New York to Keflavik in December from 344€

Return flights