AirHint found the following cheapest return flights from Newark (EWR) to Belgrade (BEG) in September 2025 (see full year).

Return flights

29 Sep - 05 Oct	FrenchBee
06 Sep - 10 Sep	FrenchBee
30 Sep - 05 Oct	TAP
01 Sep - 17 Sep	SWISS
08 Sep - 25 Sep	FrenchBee
02 Sep - 14 Sep	FrenchBee
02 Sep - 25 Sep	FrenchBee
21 Sep - 30 Sep	SWISS
09 Sep - 16 Oct	Lufthansa
01 Sep - 25 Sep	SWISS
08 Sep - 16 Oct	Austrian Airlines
01 Sep - 24 Sep	SWISS
02 Sep - 09 Sep	SWISS
01 Sep - 16 Oct	SWISS
07 Sep - 15 Oct	SWISS
08 Sep - 15 Oct	SWISS
02 Sep - 26 Sep	SWISS
25 Sep - 03 Oct	FrenchBee
30 Sep - 16 Oct	SWISS
29 Sep - 04 Oct	Icelandair

Also check the deals for one-way flights from Newark to Belgrade 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 Newark to Belgrade in September from 421€

Return flights