Question: how busy is iah airport?
Answer: Houston IAH Airport Info to Make Your Trip Easier. Houston Bush Intercontinental is one of the top five airports in the world, serving an estimated 39.8 million passengers a year. Here are some tips to make traveling via IAH easier. Busiest Times: Mon-Fri 5:00 AM to 8:00 AM, 11:00-AM to 3:00 PM, 6:00-8:00 PM.