Driving distance between DC and Dallas?

Answer 1

700 miles taking this route:

1. Take I-270 NORTH, from Washington, D.C., to I-70 WEST to HAGERSTOWN at EXIT 32 in Frederick, Maryland.
2. Take I-70 WEST to I-76 Pennsylvania TURNPIKE (toll road) - WEST to PITTSBURGH, at BREEZEWOOD, PENNSYLVANIA.
3. Take the PENNSYLVANIA TURNPIKE - WEST, on I-76, to OHIO, where I-76 continues WEST as the OHIO TURNPIKE (toll road).
4. Continue on the OHIO TURNPIKE (toll road) - WEST (on I-76, and then later on I-80/I-90) to INDIANA, where I-80/I-90 continue WEST as the INDIANA TOLL ROAD.
5. Continue on the TOLL ROAD - WEST, on I-90, to CHICAGO, Illinois, where you will enter into Chicago via the SKYWAY (toll road).

Answer 2

According to the U.S. Dept. of the Interior the driving distance between Washington, D.C. and Dallas, Texas is "about 1,310 miles".