Dallas to Houston is about 274 miles (441 km) by road and 225 miles in a straight line. The drive takes around 4 hr 54 min. The distance is the same in reverse, from Houston to Dallas.
What This Distance Means for Your Trip
At 274 miles, this is a driving distance rather than a flying one — and a train or bus is often an option too. A scheduled flight would cover only about 225 miles in the air, and once you factor in getting to the airport, checking in and clearing security, that airport time alone cancels out anything saved aloft. For a trip this length, driving is almost always the practical choice.
Want the full side-by-side on time, cost and hassle? See our drive-or-fly breakdown for Dallas to Houston.
How we calculate these figures
Straight-line distance uses the great-circle (haversine) formula between each city's centre coordinates. Road distance applies a circuity factor of roughly 1.2–1.4× to reflect that roads are not straight. Driving time assumes typical blended speeds for a trip of this length, and flight time is the great-circle distance at about 875 km/h cruise plus around 30 minutes for taxi, climb, descent and approach. The door-to-door air estimate adds about three hours for airport access, check-in, security and boarding. Real figures vary with your exact route, traffic, weather, aircraft and connections.
Dallas to Houston is the most-driven route in Texas — about 240 miles along I-45, connecting the state's two largest metropolises. The highway runs through the flat East Texas plains, passing Corsicana, Ennis, and Huntsville.
The drive is simple and fast, though I-45 carries very heavy traffic, particularly on Fridays. Most Texans treat this as a routine 3.5-hour trip.
Stops Along the Way
A historic East Texas city known for its fruitcake (seriously) and a good rest stop roughly an hour south of Dallas.
Home of Sam Houston State University and a giant roadside Sam Houston statue — about an hour north of Houston on I-45.
Meeting someone from Houston? Find the exact halfway point between Dallas and Houston so neither of you drives the whole way — or plan evenly-spaced rest and fuel stops along the route.
Tips for This Trip
Friday afternoon I-45 is brutal
The Dallas-Houston corridor is one of Texas's most congested stretches on Friday afternoons. Leave before noon or after 7pm if possible.
Budget tolls for downtown Houston
The Sam Houston Tollway and Hardy Toll Road offer faster approaches into Houston's downtown core.
Plenty of fuel and food options
Unlike some Texas drives, I-45 between Dallas and Houston has frequent service stops — you won't be caught without gas.
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Frequently Asked Questions
Houston is about 225 miles (362 km) from Dallas in a straight line, and approximately 240 miles (386 km) by road via Interstate 45.