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

Return flights

01 Sep - 15 Sep	Icelandair
20 Sep - 20 Oct	jetBlue
15 Sep - 24 Sep	Icelandair
15 Sep - 15 Oct	Icelandair
20 Sep - 11 Oct	Scandinavian Airlines
20 Sep - 04 Oct	Scandinavian Airlines
10 Sep - 24 Sep	Icelandair
15 Sep - 29 Sep	Icelandair
01 Sep - 20 Sep	Turkish Airlines
26 Sep - 10 Oct	Spirit Airlines
14 Sep - 15 Sep	Turkish Airlines
15 Sep - 25 Sep	LOT
15 Sep - 15 Oct	Air Serbia	direct
01 Sep - 20 Sep	Air Serbia	direct
20 Sep - 11 Oct	Air Serbia	direct
01 Sep - 15 Sep	Air Serbia	direct
15 Sep - 24 Sep	Air Serbia	direct

Also check the deals for one-way flights from Chicago 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 Chicago to Belgrade in September from $523

Return flights