Cheapest return flights from San Francisco to Keflavik in December from 644€

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

Return flights

15 Dec - 23 Dec Frontier Airlines
11 Dec - 18 Dec Frontier Airlines
15 Dec - 24 Dec Scandinavian Airlines
01 Dec - 15 Dec TAP
23 Dec - 17 Jan Frontier Airlines
18 Dec - 22 Dec Icelandair
13 Dec - 03 Jan Frontier Airlines

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

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