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

Return flights

29 Sep - 26 Oct	AJet
16 Sep - 26 Oct	AJet
30 Sep - 26 Oct	AJet
21 Sep - 07 Oct	Pegasus Airlines
22 Sep - 06 Oct	Pegasus Airlines
21 Sep - 19 Oct	Pegasus Airlines
26 Sep - 23 Oct	Pegasus Airlines
29 Sep - 12 Oct	AJet
22 Sep - 07 Oct	Pegasus Airlines
29 Sep - 10 Oct	Pegasus Airlines
20 Sep - 30 Sep	Pegasus Airlines
17 Sep - 29 Sep	Pegasus Airlines
18 Sep - 30 Sep	Pegasus Airlines
20 Sep - 27 Sep	Pegasus Airlines
16 Sep - 30 Sep	AJet
21 Sep - 25 Sep	Pegasus Airlines
16 Sep - 24 Sep	AJet
21 Sep - 28 Sep	Pegasus Airlines
18 Sep - 25 Sep	Pegasus Airlines
18 Sep - 27 Sep	AJet

Also check the deals for one-way flights from Cologne to Bangkok 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 Bangkok in September from 472€

Return flights