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

Return flights

19 Sep - 25 Sep	Iberojet	direct
19 Sep - 02 Oct	Iberojet	direct
05 Sep - 07 Sep	Iberojet	direct
30 Sep - 20 Oct	Air India
12 Sep - 25 Sep	Iberojet	direct
08 Sep - 11 Sep	Iberojet	direct
29 Sep - 30 Sep	Iberia
16 Sep - 23 Sep	Iberia
08 Sep - 18 Sep	Iberojet	direct
22 Sep - 28 Sep	Iberia
16 Sep - 30 Sep	Iberia
09 Sep - 16 Sep	KLM
30 Sep - 09 Oct	Iberia
07 Sep - 03 Oct	Iberia
19 Sep - 12 Oct	Iberia
07 Sep - 05 Oct	Iberia
27 Sep - 12 Oct	Iberia
27 Sep - 02 Oct	Saudia
29 Sep - 17 Oct	Iberia
25 Sep - 02 Oct	Iberia

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 $563

Return flights