AirHint found the following cheapest one-way flights from Athens (ATH) to Sofia (SOF) in September 2025 (see full year).
One-Way flights
| 18 Sep | SKY express | direct | |
| 10 Sep | Wizz Air | ||
| 17 Sep | Ryanair | ||
| 24 Sep | easyJet | ||
| 28 Sep | Volotea | ||
| 27 Sep | Aegean Airlines | direct | |
| 16 Sep | Ryanair | ||
| 14 Sep | Volotea | ||
| 08 Sep | SKY express | direct | |
| 10 Sep | SKY express | direct |
Also check the deals for return flights from Athens to Sofia 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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