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

One-Way flights

17 Sep	Thai Lion Air
18 Sep	IndiGo
28 Sep	Thai Lion Air
15 Sep	Thai VietJet Air
29 Sep	IndiGo
16 Sep	Thai Lion Air
30 Sep	Thai VietJet Air
21 Sep	Thai VietJet Air
14 Sep	IndiGo
25 Sep	Thai VietJet Air

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