AirHint found the following cheapest return flights from Frankfurt (FRA) to Nis (INI) in September 2025 (see full year).

Return flights

30 Sep - 04 Oct	Air Serbia	direct
20 Sep - 27 Sep	Air Serbia	direct
27 Sep - 11 Oct	Air Serbia	direct
23 Sep - 30 Sep	Air Serbia	direct
13 Sep - 20 Sep	Air Serbia	direct
19 Sep - 27 Sep	Ryanair
06 Sep - 09 Sep	Air Serbia	direct
10 Sep - 17 Sep	Ryanair
09 Sep - 21 Sep	Air Serbia
19 Sep - 21 Sep	Air Serbia
18 Sep - 25 Sep	Ryanair

Also check the deals for one-way flights from Frankfurt to Nis 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 Frankfurt to Nis in September from $182

Return flights