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

Return flights

23 Sep - 14 Oct	Etihad Airways
24 Sep - 15 Oct	Etihad Airways
30 Sep - 06 Oct	Etihad Airways
26 Sep - 03 Oct	Etihad Airways
21 Sep - 28 Sep	Etihad Airways
19 Sep - 25 Sep	Iberojet	direct
25 Sep - 11 Oct	IndiGo
23 Sep - 15 Oct	IndiGo
25 Sep - 09 Oct	IndiGo
26 Sep - 02 Oct	Iberojet	direct
21 Sep - 04 Oct	Thai AirAsia
23 Sep - 05 Oct	IndiGo
24 Sep - 26 Sep	Iberia
19 Sep - 27 Sep	Iberia
20 Sep - 27 Sep	Turkmenistan Airlines
20 Sep - 23 Sep	Saudia
17 Sep - 22 Sep	Emirates

Also check the deals for one-way flights from Bangkok to Madrid 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 Bangkok to Madrid in September from $650

Return flights