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

Return flights

30 Sep - 03 Oct	Wizz Air UK
17 Sep - 24 Sep	Wizz Air UK
05 Sep - 14 Sep	Wizz Air
11 Sep - 17 Sep	Wizz Air
15 Sep - 22 Sep	Pegasus Airlines
11 Sep - 18 Sep	Wizz Air
12 Sep - 19 Sep	Pegasus Airlines
12 Sep - 19 Sep	Pegasus Airlines	direct
15 Sep - 22 Sep	Pegasus Airlines	direct
14 Sep - 21 Sep	Pegasus Airlines
06 Sep - 13 Sep	Wizz Air
29 Sep - 06 Oct	AJet	direct
29 Sep - 05 Oct	AJet	direct
30 Sep - 03 Oct	Turkish Airlines	direct
27 Sep - 03 Oct	Turkish Airlines	direct
27 Sep - 04 Oct	Wizz Air
27 Sep - 04 Oct	Turkish Airlines	direct

Also check the deals for one-way flights from Belgrade to Istanbul 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 Belgrade to Istanbul in September from 119€

Return flights