AirHint found the following cheapest return flights from New York (JFK) to Sofia (SOF) in September 2025 (see full year).

Return flights

30 Sep - 14 Oct	SWISS
16 Sep - 30 Sep	SWISS
16 Sep - 01 Oct	SWISS
17 Sep - 30 Sep	SWISS
12 Sep - 25 Sep	SWISS
12 Sep - 26 Sep	SWISS
18 Sep - 30 Sep	SWISS
26 Sep - 08 Oct	SWISS
26 Sep - 09 Oct	SWISS
26 Sep - 10 Oct	SWISS
26 Sep - 07 Oct	SWISS
05 Sep - 28 Sep	LOT

Also check the deals for one-way flights from New York 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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Cheapest return flights from New York to Sofia in September from 352€

Return flights