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

Return flights

29 Sep - 08 Oct	Air Serbia	direct
29 Sep - 05 Oct	Air Serbia	direct
24 Sep - 29 Sep	Air Serbia
29 Sep - 02 Oct	Air Serbia
24 Sep - 25 Sep	Air Serbia
29 Sep - 12 Oct	Air Serbia
22 Sep - 26 Sep	Air Serbia
17 Sep - 22 Sep	Air Serbia
22 Sep - 28 Sep	Air Serbia
29 Sep - 06 Oct	Air Serbia
17 Sep - 21 Sep	Wizz Air Malta
18 Sep - 22 Sep	Lufthansa
28 Sep - 01 Oct	Lufthansa
20 Sep - 22 Sep	Lufthansa
21 Sep - 24 Sep	SWISS
21 Sep - 26 Sep	SWISS
27 Sep - 01 Oct	Austrian Airlines
21 Sep - 01 Oct	SWISS
28 Sep - 05 Oct	Wizz Air Malta
21 Sep - 03 Oct	Austrian Airlines

Also check the deals for one-way flights from Stuttgart 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 Stuttgart to Belgrade in September from $152

Return flights