Houston Airport or George Bush Intercontinental Airport (IAH) is often preferred how far is Austin from Houston. 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.