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

Return flights

23 Sep - 30 Sep	Wizz Air UK
27 Sep - 29 Sep	AJet
09 Sep - 18 Sep	AJet
17 Sep - 24 Sep	Wizz Air UK
14 Sep - 20 Sep	Pegasus Airlines
17 Sep - 20 Sep	Wizz Air UK
11 Sep - 20 Sep	Pegasus Airlines
15 Sep - 18 Sep	Pegasus Airlines	direct
27 Sep - 02 Oct	AJet
15 Sep - 22 Sep	Pegasus Airlines
02 Sep - 04 Sep	Pegasus Airlines
29 Sep - 02 Oct	Pegasus Airlines
28 Sep - 02 Oct	AJet
24 Sep - 03 Oct	AJet
25 Sep - 08 Oct	Pegasus Airlines
26 Sep - 01 Oct	Pegasus Airlines
29 Sep - 02 Oct	Pegasus Airlines	direct
28 Sep - 02 Oct	Pegasus Airlines	direct
26 Sep - 02 Oct	Pegasus Airlines	direct
30 Sep - 04 Oct	AJet

Also check the deals for one-way flights from Istanbul 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 Istanbul to Belgrade in September from $141

Return flights