Thedistance between Dallas and Houston may vary depending upon the travel mode you choose. If you are willing to travel between the two cities by plane, it will cover a distance of 224 miles. The distance between both the cities is almost similar for all the flight options such as United Airlines, Alaska Airlines, and American Airlines. On the contrary, it covers 240 miles/385 km if you prefer to travel non-stop by road. The driving time may differ based on the average speed of a car. Moreover, it depends on what route you are taking from I-45 S and Hwy 6 S.