Most people who come to Dallas arrive by air since Dallas is home to DFW, the Dallas-Fort Worth International airport.
Coming from the south, I-45 is the major highway for travel between Houston and Dallas, while I-35 connects the city to Austin and San Antonio.If you come in on I-35 you need to keep in mind that, a few dozen miles both north and south of the "metroplex," the interstate splits into I-35W (which runs north/south through Fort Worth) and I-35E (the branch that runs north/south through Dallas). Miss the split and you'll wind up in a different city. Coming from the west, Dallas is reached by either I-20 on the south side or I-30 which comes directly into downtown. Both of these interstate highways approach Dallas from the east. I-20 comes from Shreveport, Louisiana and I-30 comes from Texarkana.