Schedule a phone call from Thailand to United States. If you live in Thailand and you want to call a friend in United States, you can try calling them between 8:00 PM and 12:00 PM your time. This will be between 7AM - 11PM their time, since United States is 13 hours behind Thailand. If you're available any time, but you want to reach someone in United States at work, you may want to try between 10:00 PM and 6:00 AM your time. This is the best time to reach them from 9AM - 5PM during normal working hours.