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

Return flights

01 Sep - 22 Sep	Turkish Airlines
18 Sep - 21 Sep	Lufthansa
15 Sep - 14 Oct	Lufthansa
08 Sep - 07 Oct	Lufthansa
14 Sep - 22 Sep	Ryanair
18 Sep - 25 Sep	Lufthansa
10 Sep - 02 Oct	Lufthansa
18 Sep - 23 Sep	Lufthansa
03 Sep - 24 Sep	Lufthansa
06 Sep - 22 Sep	Turkish Airlines
28 Sep - 13 Oct	AJet
14 Sep - 04 Oct	Lufthansa
15 Sep - 30 Sep	Lufthansa
30 Sep - 14 Oct	Eurowings
01 Sep - 30 Sep	Eurowings
13 Sep - 16 Sep	Lufthansa
26 Sep - 08 Oct	Lufthansa
13 Sep - 11 Oct	Lufthansa
28 Sep - 12 Oct	AJet
19 Sep - 11 Oct	Lufthansa

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.

Book a cheap hotel in Bangkok

Cheap car rent in Bangkok

Cheapest return flights from Cologne to Bangkok in September from $681

Return flights