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

Return flights

23 Aug - 03 Sep	Etihad Airways
21 Aug - 31 Aug	KLM
30 Aug - 05 Sep	Singapore Airlines
27 Aug - 02 Sep	Singapore Airlines
12 Aug - 09 Sep	Singapore Airlines
15 Aug - 29 Aug	Singapore Airlines
16 Aug - 23 Aug	Singapore Airlines
06 Aug - 21 Aug	Singapore Airlines
12 Aug - 11 Sep	Singapore Airlines
11 Aug - 18 Aug	Singapore Airlines
05 Aug - 12 Aug	Singapore Airlines

Also check the deals for one-way flights from Cardiff to Bangkok in August.

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 August from 847€

Return flights