AirHint found the following cheapest return flights from Newark (EWR) to Sofia (SOF) in September 2025 (see full year).
Return flights
| 02 Sep - 16 Sep | Air Canada | ||
| 03 Sep - 15 Sep | LOT | ||
| 06 Sep - 09 Sep | LOT | ||
| 27 Sep - 07 Oct | LOT | ||
| 07 Sep - 11 Sep | Aer Lingus |
Also check the deals for one-way flights from Newark 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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