AirHint found the following cheapest return flights from San Francisco (SFO) to Keflavik (KEF) in May 2026 (see full year).
Return flights
| 19 May - 26 May | WestJet | ||
| 12 May - 06 Jun | Lufthansa | ||
| 27 May - 03 Jun | jetBlue | ||
| 26 May - 02 Jun | United | ||
| 24 May - 30 May | SWISS |
Also check the deals for one-way flights from San Francisco to Keflavik in May.
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