Bangkok is 14-15 hours ahead of Los Angeles. Los Angeles uses Pacific Time (PT) while Bangkok uses Indochina Time (ICT, UTC+7). When it's 6:00 AM in Los Angeles, it's 8:00 PM in Bangkok.
Thailand does not observe daylight saving time, but California does. The difference is 14 hours during Pacific Daylight Time and 15 hours during Pacific Standard Time.
Best calling time: 5:00 PM - 8:00 PM Los Angeles time. This corresponds to 7:00 AM - 10:00 AM in Bangkok, catching the start of Thai business hours.
Bangkok is a major Southeast Asian hub and popular tourist destination. Direct flights from Los Angeles take about 17 hours. Thailand is a growing market for US business.