Distance, Gas Consumption and Emission Notes. Distance from Little Rock, AR to Dallas, TX is 319Miles or 514 Km. You can get this distance about 4 hours 40 mins. If you want to planning travel with plane for 293 Miles or 472 Km, You can get this distance about 1 hours 7 mins . A car with an average MPG will needs 14.77 gallons of gas to get the route between these points. The estimated cost of gas to get between Little Rock, AR and Dallas, TX is $33.53. During the route, an average car will release 289.37 pounds of CO2 to the atmosphere. Your carbon footprint is 0.91 pounds of CO2 per mile.