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

Return flights

10 Sep - 30 Sep	Air Canada
09 Sep - 30 Sep	Air Canada
22 Sep - 30 Sep	Air Canada
15 Sep - 29 Sep	Air Canada
08 Sep - 04 Oct	Air Canada
16 Sep - 30 Sep	Air Canada
15 Sep - 30 Sep	Air Canada
06 Sep - 10 Sep	United
06 Sep - 11 Sep	United
07 Sep - 11 Sep	Lufthansa
23 Sep - 28 Sep	United

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.

Book a cheap hotel in Sofia

Cheap car rent in Sofia

Cheapest return flights from New York to Sofia in September from $449

Return flights