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

Return flights

27 Sep - 04 Oct	Air Serbia	direct
16 Sep - 20 Sep	Air Serbia	direct
20 Sep - 23 Sep	Air Serbia	direct
06 Sep - 09 Sep	Air Serbia	direct
02 Sep - 27 Sep	Air Serbia	direct
19 Sep - 22 Sep	Ryanair
18 Sep - 22 Sep	Ryanair
02 Sep - 07 Sep	Air Serbia
08 Sep - 26 Sep	Air Serbia
17 Sep - 22 Sep	Austrian Airlines
15 Sep - 03 Oct	Air Serbia

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 127€

Return flights