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

Return flights

01 Sep - 19 Sep	SWISS
14 Sep - 22 Sep	SWISS
01 Sep - 08 Sep	SWISS
01 Sep - 15 Sep	SWISS
09 Sep - 18 Sep	SWISS
10 Sep - 23 Sep	SWISS
03 Sep - 25 Sep	SWISS
07 Sep - 18 Sep	Austrian Airlines
28 Sep - 15 Oct	SWISS
22 Sep - 09 Oct	SWISS
23 Sep - 09 Oct	SWISS
07 Sep - 14 Oct	Delta
05 Sep - 11 Sep	SWISS
30 Sep - 30 Oct	United
08 Sep - 14 Sep	SWISS
19 Sep - 02 Oct	SWISS
17 Sep - 03 Oct	SWISS

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 360€

Return flights