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

Return flights

08 Dec - 15 Dec	Finnair
30 Dec - 16 Jan	Finnair
30 Dec - 24 Jan	Finnair
06 Dec - 13 Dec	jetBlue
03 Dec - 10 Dec	Icelandair	direct
13 Dec - 20 Dec	jetBlue
09 Dec - 16 Dec	Icelandair	direct
04 Dec - 11 Dec	jetBlue
07 Dec - 14 Dec	jetBlue
30 Dec - 16 Jan	Icelandair	direct
14 Dec - 21 Dec	jetBlue
11 Dec - 18 Dec	Icelandair
11 Dec - 18 Dec	Icelandair	direct
30 Dec - 24 Jan	Icelandair	direct
30 Dec - 08 Jan	Icelandair	direct
31 Dec - 07 Jan	Icelandair	direct
24 Dec - 17 Jan	Finnair
30 Dec - 06 Jan	Icelandair	direct
29 Dec - 09 Jan	Icelandair	direct
15 Dec - 10 Jan	Finnair

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.

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Cheapest return flights from New York to Keflavik in December from 370€

Return flights