AirHint found the following cheapest return flights from Raleigh-durham (RDU) to Keflavik (KEF) in December 2025 (see full year).

Return flights

14 Dec - 21 Dec	Icelandair	direct
06 Dec - 10 Dec	Frontier Airlines
10 Dec - 15 Dec	jetBlue
27 Dec - 17 Jan	Icelandair	direct
22 Dec - 29 Dec	Icelandair	direct
12 Dec - 22 Dec	Icelandair	direct
22 Dec - 26 Dec	Icelandair	direct
21 Dec - 26 Dec	Icelandair	direct
13 Dec - 21 Dec	jetBlue
13 Dec - 21 Dec	Icelandair	direct
23 Dec - 30 Dec	Frontier Airlines
23 Dec - 03 Jan	Frontier Airlines
26 Dec - 03 Jan	Spirit Airlines

Also check the deals for one-way flights from Raleigh-durham 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 Raleigh-durham to Keflavik in December from $557

Return flights