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

Return flights

23 Sep - 30 Sep	Ryanair
26 Sep - 30 Sep	Ryanair
24 Sep - 26 Sep	Ryanair
25 Sep - 29 Sep	Ryanair
26 Sep - 29 Sep	Ryanair
24 Sep - 01 Oct	Ryanair
22 Sep - 25 Sep	AJet
23 Sep - 01 Oct	Ryanair
30 Sep - 03 Oct	Ryanair
29 Sep - 03 Oct	Ryanair
23 Sep - 27 Sep	Ryanair
28 Sep - 01 Oct	Pegasus Airlines
30 Sep - 30 Sep	Lufthansa

Also check the deals for one-way flights from Cologne to Tallinn 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 Cologne to Tallinn in September from $198

Return flights