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

Return flights

09 Dec - 16 Dec	Vueling Airlines
02 Dec - 09 Dec	Vueling Airlines
06 Dec - 23 Dec	Ryanair
04 Dec - 18 Dec	Ryanair
04 Dec - 21 Jan	Etihad Airways
02 Dec - 23 Dec	Etihad Airways
03 Dec - 21 Jan	Etihad Airways
30 Dec - 21 Jan	Etihad Airways
06 Dec - 22 Jan	Etihad Airways
06 Dec - 21 Jan	Etihad Airways
06 Dec - 28 Jan	Etihad Airways
06 Dec - 23 Jan	Etihad Airways
06 Dec - 24 Jan	Etihad Airways
06 Dec - 25 Jan	Etihad Airways
14 Dec - 21 Dec	Ryanair
11 Dec - 21 Jan	Ryanair
14 Dec - 31 Dec	Ryanair

Also check the deals for one-way flights from Cardiff 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 Cardiff to Bangkok in December from $693

Return flights