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

Return flights

30 Dec - 21 Jan	Etihad Airways
01 Dec - 15 Dec	Vueling Airlines
03 Dec - 24 Dec	Etihad Airways
31 Dec - 25 Jan	Etihad Airways
10 Dec - 09 Jan	Ryanair
02 Dec - 16 Jan	Singapore Airlines
24 Dec - 04 Jan	KLM
29 Dec - 15 Jan	Singapore Airlines
27 Dec - 10 Jan	Singapore Airlines
27 Dec - 09 Jan	Singapore Airlines
21 Dec - 09 Jan	Singapore Airlines
24 Dec - 03 Jan	Singapore Airlines

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 726€

Return flights