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

Return flights

22 Sep - 28 Sep	Iberojet	direct
22 Sep - 25 Sep	Iberojet	direct
19 Sep - 28 Sep	Iberojet	direct
19 Sep - 12 Oct	Iberojet	direct
15 Sep - 28 Sep	Iberojet	direct
29 Sep - 09 Oct	Iberojet	direct
26 Sep - 12 Oct	Iberojet	direct
04 Sep - 17 Sep	Iberia
15 Sep - 18 Sep	Iberojet	direct
26 Sep - 05 Oct	Iberojet	direct
04 Sep - 11 Sep	Iberia
09 Sep - 16 Sep	Iberia
09 Sep - 25 Sep	Iberia
30 Sep - 09 Oct	Iberia
05 Sep - 18 Sep	Iberia
19 Sep - 03 Oct	Iberia
20 Sep - 11 Oct	Iberia
19 Sep - 11 Oct	Iberia
26 Sep - 07 Oct	Etihad Airways
28 Sep - 06 Oct	Etihad Airways

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 494€

Return flights