Cheap Bus and Carpool tickets to Roma, US

What are the most popular routes to Roma?

Houston - RomaAverage price$124Average duration10h 55mDaily departures5
McAllen - RomaAverage price$28Average duration1h 30mDaily departures1
Brownsville - RomaAverage price$50Average duration3h 15mDaily departures1
Laredo - RomaAverage price$34Average duration1h 55mDaily departures1
San Antonio - RomaAverage price$79Average duration5h 25mDaily departures1