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

Return flights

09 Dec - 20 Jan	Frontier Airlines
08 Dec - 12 Dec	Spirit Airlines
15 Dec - 10 Jan	jetBlue
29 Dec - 12 Jan	Finnair
11 Dec - 17 Dec	jetBlue
23 Dec - 27 Dec	Frontier Airlines
13 Dec - 25 Dec	Spirit Airlines
24 Dec - 28 Dec	Frontier Airlines
22 Dec - 28 Dec	Frontier Airlines
14 Dec - 21 Dec	Frontier Airlines
21 Dec - 10 Jan	Frontier Airlines
16 Dec - 21 Dec	Sun Country Airlines
27 Dec - 30 Dec	Scandinavian Airlines
17 Dec - 31 Dec	Spirit Airlines
25 Dec - 01 Jan	Spirit Airlines
14 Dec - 03 Jan	Frontier Airlines
27 Dec - 01 Jan	Frontier Airlines

Also check the deals for one-way flights from Los Angeles 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 Los Angeles to Keflavik in December from $514

Return flights