AirHint found the following cheapest return flights from Sofia (SOF) to Keflavik (KEF) in September 2025 (see full year).
Return flights
| 24 Sep - 04 Oct | Ryanair | ||
| 11 Sep - 17 Sep | Wizz Air | ||
| 20 Sep - 30 Sep | Lufthansa | ||
| 01 Sep - 06 Sep | Wizz Air | ||
| 04 Sep - 04 Sep | Ryanair | ||
| 06 Sep - 12 Sep | Lufthansa | ||
| 07 Sep - 12 Sep | Austrian Airlines |
Also check the deals for one-way flights from Sofia to Keflavik in September.
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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