Cheapest return flights from San Francisco to Keflavik in May from $578

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 May 2025 (see full year).

Return flights

06 May - 13 May Alaska Airlines
01 May - 08 May Frontier Airlines
28 May - 02 Jun Hawaiian Airlines
22 May - 27 May Sun Country Airlines
16 May - 24 May Alaska Airlines
23 May - 04 Jun Hawaiian Airlines
21 May - 25 May British Airways

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

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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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