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

Return flights

30 Sep - 04 Oct	Ryanair	direct
27 Sep - 30 Sep	Ryanair	direct
23 Sep - 30 Sep	Ryanair	direct
30 Sep - 02 Oct	Ryanair	direct
23 Sep - 05 Oct	Ryanair	direct
30 Sep - 07 Oct	Ryanair
20 Sep - 23 Sep	Norwegian Air Sweden AOC
30 Sep - 07 Oct	Ryanair	direct
12 Sep - 16 Sep	Ryanair
09 Sep - 16 Sep	Ryanair
20 Sep - 23 Sep	Ryanair	direct
16 Sep - 20 Sep	Ryanair	direct
13 Sep - 16 Sep	Ryanair	direct
09 Sep - 16 Sep	Ryanair	direct
26 Sep - 28 Sep	Norwegian Air Sweden AOC

Also check the deals for one-way flights from Riga to Cologne 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 Riga to Cologne in September from 62€

Return flights