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

Return flights

14 Dec - 23 Dec	Icelandair	direct
10 Dec - 15 Dec	Icelandair	direct
21 Dec - 28 Dec	Icelandair	direct
21 Dec - 26 Dec	Icelandair	direct
22 Dec - 04 Jan	Icelandair	direct
19 Dec - 26 Dec	Icelandair	direct
20 Dec - 27 Dec	Icelandair	direct
19 Dec - 04 Jan	Icelandair	direct
17 Dec - 03 Jan	Spirit Airlines
18 Dec - 03 Jan	jetBlue
28 Dec - 03 Jan	Icelandair
28 Dec - 03 Jan	Icelandair	direct

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 $543

Return flights