Cheapest return flights from San Francisco to Keflavik in December from $745

Best time to book flights for San Francisco (SFO) to Keflavik (KEF) flights at AirHint

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

Return flights

30 Dec - 06 Jan British Airways
30 Dec - 07 Jan British Airways
31 Dec - 07 Jan British Airways
31 Dec - 08 Jan British Airways
29 Dec - 05 Jan jetBlue
28 Dec - 04 Jan jetBlue
23 Dec - 30 Dec Lufthansa
25 Dec - 01 Jan jetBlue
22 Dec - 29 Dec jetBlue
21 Dec - 28 Dec Lufthansa
27 Dec - 03 Jan jetBlue
26 Dec - 02 Jan jetBlue
24 Dec - 31 Dec Icelandair

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

Skyscanner

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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