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

Return flights

03 Dec - 23 Dec	Etihad Airways
07 Dec - 15 Dec	Etihad Airways
04 Dec - 17 Dec	Etihad Airways
03 Dec - 18 Dec	Etihad Airways
02 Dec - 15 Dec	Etihad Airways
04 Dec - 22 Dec	Etihad Airways
04 Dec - 15 Dec	Etihad Airways
04 Dec - 13 Jan	Etihad Airways
02 Dec - 18 Dec	Etihad Airways
07 Dec - 21 Dec	Etihad Airways
04 Dec - 09 Dec	Etihad Airways
10 Dec - 29 Jan	Iberia Express
08 Dec - 28 Jan	Iberia Express
07 Dec - 09 Jan	Saudia
30 Dec - 20 Jan	Saudia
14 Dec - 09 Jan	Saudia
10 Dec - 13 Jan	Iberia Express
05 Dec - 08 Jan	Air China
03 Dec - 30 Jan	Iberia Express
07 Dec - 16 Jan	Air China

Also check the deals for one-way flights from Madrid to Bangkok in December.

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 Madrid to Bangkok in December from 505€

Return flights