It takes approximately three hours and 36 minutes to drive from Dallas to Houston using I-45 South. The flight time between the two cities is roughly 42 minutes. The travel time from gate to gate between airlines is about 55 minutes.
Another driving route, predominantly using TX-6 South, takes approximately four hours and 17 minutes from Dallas to Houston. Times are always approximate and depend on traffic conditions, among other factors. Using I-45 South is the most direct route, and this trip is approximately 238 miles. Using TX-6 South requires more turns and local roads, and the mileage is approximately 273 miles.