http://www.airlineconsolidator.com/ Dallas to Bangkok lists from under $900 to over $1000 depending on the airline. Check it out. Between 14 and 16 hours depending on the airline. If you stop in Tokyo, the total flight duration is around 20 hours.
15 hours.
Depends where
It would take at least 10 hours, but there is no direct link from Wales to Thailand.
5-6 Hours
About 19 hours.
11 hours 43 minutes
It would take three hours to fly from Dallas to Belize city.
You can't fly directly from Aberdeen to Thailand, but if you could, it would take about 12 hours.
About 3 hours.
16 hours and 27 minutes
2 hours
5 hours