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
27 Sep	Thai VietJet Air
21 Sep	Thai Lion Air
28 Sep	Nok Air
13 Sep	Hainan Airlines
22 Sep	Thai Lion Air
29 Sep	Thai Lion Air
15 Sep	Hainan Airlines
12 Sep	Thai VietJet Air
11 Sep	Thai AirAsia

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 258€

One-Way flights