AirHint found the following cheapest one-way flights from Porto (OPO) to Sofia (SOF) in September 2026 (see full year).
One-Way flights
| 21 Sep | Ryanair | ||
| 12 Sep | Ryanair | ||
| 20 Sep | Ryanair | ||
| 20 Sep | Bulgaria Air | direct |
Also check the deals for return flights from Porto to Sofia in September.
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