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

Return flights

06 Dec - 14 Dec	jetBlue
05 Dec - 13 Dec	jetBlue
13 Dec - 21 Dec	British Airways
14 Dec - 22 Dec	British Airways
09 Dec - 17 Dec	jetBlue
08 Dec - 13 Dec	Scandinavian Airlines
10 Dec - 18 Dec	jetBlue
17 Dec - 25 Dec	jetBlue
21 Dec - 29 Dec	Scandinavian Airlines
30 Dec - 08 Jan	Virgin Atlantic
28 Dec - 05 Jan	Scandinavian Airlines
18 Dec - 26 Dec	jetBlue
26 Dec - 02 Jan	Scandinavian Airlines
28 Dec - 03 Jan	Scandinavian Airlines
21 Dec - 03 Jan	Scandinavian Airlines

Also check the deals for one-way flights from Atlanta 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 Atlanta to Keflavik in December from $702

Return flights