AirHint found the following cheapest return flights from San Francisco (SFO) to Keflavik (KEF) in May 2026 (see full year).
Return flights
| 02 May - 23 May | Alaska Airlines | ||
| 02 May - 10 May | Scandinavian Airlines | ||
| 03 May - 10 May | Icelandair | ||
| 30 May - 07 Jun | Icelandair | ||
| 26 May - 02 Jun | Alaska Airlines | ||
| 22 May - 26 May | WestJet |
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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