AirHint found the following cheapest return flights from Keflavik (KEF) to Sofia (SOF) in May 2026 (see full year).
Return flights
| 20 May - 29 May | easyJet | ||
| 22 May - 29 May | easyJet | ||
| 19 May - 29 May | Wizz Air Malta | ||
| 20 May - 28 May | easyJet | ||
| 19 May - 28 May | Wizz Air Malta | ||
| 21 May - 29 May | easyJet | ||
| 18 May - 28 May | easyJet |
Also check the deals for one-way flights from Keflavik to Sofia in May.
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