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

Return flights

09 Sep - 24 Sep	Air France
10 Sep - 25 Sep	Air France
10 Sep - 24 Sep	Air France
03 Sep - 25 Sep	KLM
09 Sep - 25 Sep	Air France
07 Sep - 22 Sep	Air France
02 Sep - 22 Sep	KLM
03 Sep - 02 Oct	KLM
10 Sep - 10 Oct	KLM
11 Sep - 18 Sep	Ryanair
10 Sep - 23 Sep	Air France
17 Sep - 24 Sep	Etihad Airways
11 Sep - 06 Oct	Air France
18 Sep - 16 Oct	Etihad Airways
18 Sep - 06 Oct	Etihad Airways
23 Sep - 09 Oct	Etihad Airways
25 Sep - 08 Oct	Etihad Airways
25 Sep - 06 Oct	Etihad Airways
20 Sep - 05 Oct	KLM
18 Sep - 09 Oct	Etihad Airways

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 $589

Return flights