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

One-Way flights

20 Sep	Hainan Airlines
21 Sep	Thai Lion Air
15 Sep	Nok Air
14 Sep	Thai AirAsia
25 Sep	Thai AirAsia
30 Sep	Thai AirAsia
23 Sep	Thai AirAsia
28 Sep	Thai AirAsia
27 Sep	Thai AirAsia
06 Sep	Hainan Airlines

Also check the deals for return 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 one-way flights from Bangkok to Madrid in September from 259€

One-Way flights