The calculation of flight time is based on the straight line flight distance from Guam to Thailand (as the crow flies), which is about 3,000 miles or 4 828 kilometers. Your trip begins in Guam. It ends in Thailand. Your flight direction from Guam to Thailand is West (-82 degrees from North). The flight time calculator measures the average flight duration between points. It uses the great circle formula to compute the travel mileage.