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

Return flights

16 Sep - 26 Oct	AJet
20 Sep - 14 Oct	Turkish Airlines
06 Sep - 18 Sep	Lufthansa
08 Sep - 07 Oct	Lufthansa
04 Sep - 18 Sep	Austrian Airlines
02 Sep - 17 Sep	Austrian Airlines
09 Sep - 16 Sep	Austrian Airlines
12 Sep - 01 Oct	Austrian Airlines
15 Sep - 14 Oct	Austrian Airlines
20 Sep - 13 Oct	Turkish Airlines
30 Sep - 14 Oct	Turkish Airlines
06 Sep - 14 Sep	Lufthansa
08 Sep - 14 Sep	Lufthansa
08 Sep - 15 Sep	Lufthansa
07 Sep - 14 Sep	Lufthansa
06 Sep - 17 Sep	Lufthansa
08 Sep - 17 Sep	Lufthansa
10 Sep - 01 Oct	Lufthansa
24 Sep - 08 Oct	Austrian Airlines
28 Sep - 30 Oct	Turkish Airlines

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 516€

Return flights