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

Return flights

24 Sep - 28 Sep	Ryanair	direct
21 Sep - 24 Sep	Ryanair	direct
03 Sep - 14 Sep	Ryanair	direct
03 Sep - 07 Sep	Ryanair	direct
03 Sep - 10 Sep	Ryanair	direct
10 Sep - 28 Sep	Ryanair	direct
10 Sep - 24 Sep	Ryanair	direct
10 Sep - 14 Sep	Ryanair	direct
07 Sep - 24 Sep	Ryanair	direct
07 Sep - 10 Sep	Ryanair	direct
27 Sep - 04 Oct	Lufthansa
23 Sep - 05 Oct	Lufthansa

Also check the deals for one-way flights from Frankfurt to Rijeka 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 Rijeka in September from $64

Return flights