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

Return flights

29 Dec - 09 Jan	British Airways
18 Dec - 08 Jan	Lufthansa
22 Dec - 05 Jan	Icelandair
18 Dec - 03 Jan	Frontier Airlines
18 Dec - 02 Jan	Frontier Airlines
19 Dec - 04 Jan	Frontier Airlines
17 Dec - 02 Jan	Alaska Airlines
20 Dec - 04 Jan	Spirit Airlines
18 Dec - 04 Jan	Alaska 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 568€

Return flights