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

Return flights

02 Dec - 13 Dec	Vueling Airlines
26 Dec - 13 Jan	Ryanair
25 Dec - 17 Jan	KLM
10 Dec - 15 Jan	KLM
01 Dec - 31 Dec	Singapore Airlines
03 Dec - 07 Dec	Singapore Airlines
10 Dec - 27 Dec	Singapore Airlines
01 Dec - 22 Dec	Singapore Airlines
11 Dec - 21 Dec	Singapore Airlines
01 Dec - 14 Dec	Singapore Airlines
30 Dec - 13 Jan	Singapore Airlines
29 Dec - 18 Jan	Singapore Airlines
13 Dec - 16 Jan	Singapore Airlines
27 Dec - 16 Jan	Singapore Airlines
13 Dec - 31 Jan	Singapore Airlines
03 Dec - 10 Dec	Singapore Airlines
01 Dec - 16 Dec	Singapore Airlines
31 Dec - 14 Jan	Singapore Airlines
26 Dec - 11 Jan	Singapore Airlines
17 Dec - 24 Dec	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 619€

Return flights