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

Return flights

03 Sep - 30 Sep	Etihad Airways
09 Sep - 22 Sep	Etihad Airways
11 Sep - 22 Sep	Etihad Airways
30 Sep - 06 Oct	Etihad Airways
08 Sep - 21 Sep	Etihad Airways
12 Sep - 23 Sep	Etihad Airways
08 Sep - 26 Sep	Etihad Airways
30 Sep - 14 Oct	Etihad Airways
29 Sep - 05 Oct	Etihad Airways
29 Sep - 06 Oct	Etihad Airways
03 Sep - 24 Sep	KLM
10 Sep - 24 Sep	KLM
07 Sep - 22 Sep	Air France
07 Sep - 25 Sep	Air France
21 Sep - 13 Oct	KLM
21 Sep - 06 Oct	KLM
07 Sep - 12 Oct	Air France
09 Sep - 14 Oct	KLM
21 Sep - 02 Oct	KLM
21 Sep - 05 Oct	KLM

Also check the deals for one-way flights from Madrid 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 Madrid to Bangkok in September from 468€

Return flights