AirHint found the following cheapest return flights from San Francisco (SFO) to Keflavik (KEF) in January 2026 (see full year).

Return flights

13 Jan - 20 Jan	British Airways
07 Jan - 14 Jan	Hawaiian Airlines
10 Jan - 17 Jan	Hawaiian Airlines
20 Jan - 27 Jan	Hawaiian Airlines
21 Jan - 28 Jan	Hawaiian Airlines
24 Jan - 31 Jan	Hawaiian Airlines
11 Jan - 18 Jan	Hawaiian Airlines
16 Jan - 23 Jan	Hawaiian Airlines
19 Jan - 26 Jan	Hawaiian Airlines
22 Jan - 29 Jan	Hawaiian Airlines
25 Jan - 01 Feb	Alaska Airlines

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

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 San Francisco to Keflavik in January from $559

Return flights