Houston Airport or George Bush Intercontinental Airport (IAH) is often preferred . For your return trip to Houston, you can go to the Austin Airport or Austin-Bergstrom International Airport (ABIA).Some airlines can offer connecting flights. These flights can span over 6 hours to almost 19 hours. However, the majority of commercial flights from Austin, TX, to Houston, TX, are non-stop and cover 147 miles/236 kilometers in nearly 50 minutes. The airlines available for this route are United Airlines, American Airlines, Delta Airlines, Spirit Airlines, Alaska Airlines, and Southwest Airlines.