Cheapest return flights from San Diego to Keflavik in December from $594

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

Return flights

04 Dec - 08 Dec Frontier Airlines
29 Dec - 24 Jan Frontier Airlines
29 Dec - 06 Jan Frontier Airlines
25 Dec - 17 Jan Alaska Airlines
21 Dec - 29 Dec Frontier Airlines
18 Dec - 25 Dec Alaska Airlines
23 Dec - 03 Jan Frontier Airlines
29 Dec - 03 Jan Alaska Airlines
27 Dec - 03 Jan Frontier Airlines

Also check the deals for one-way flights from San Diego to Keflavik in December.

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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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