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

Return flights

12 Jan - 19 Jan	British Airways
10 Jan - 16 Jan	Alaska Airlines
10 Jan - 14 Jan	Alaska Airlines
10 Jan - 15 Jan	Alaska Airlines
14 Jan - 19 Jan	British Airways
11 Jan - 17 Jan	Alaska Airlines
10 Jan - 17 Jan	British Airways

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 $606

Return flights