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

Return flights

22 Sep - 26 Sep	Ryanair
26 Sep - 28 Sep	Ryanair
26 Sep - 30 Sep	Ryanair
25 Sep - 28 Sep	Ryanair
21 Sep - 29 Sep	Ryanair
25 Sep - 29 Sep	Ryanair
26 Sep - 29 Sep	Ryanair
01 Sep - 17 Sep	Ryanair
18 Sep - 22 Sep	Ryanair
18 Sep - 21 Sep	Ryanair
26 Sep - 01 Oct	Lufthansa	direct

Also check the deals for one-way flights from Frankfurt to Riga 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 Riga in September from 134€

Return flights