Cheap Bus and Carpool tickets to Roma, US

What are the most popular routes to Roma?

Houston - RomaAverage price£67Average duration10h 55mDaily departures5
McAllen - RomaAverage price£15Average duration1h 30mDaily departures1
Brownsville - RomaAverage price£27Average duration3h 15mDaily departures1
Laredo - RomaAverage price£19Average duration1h 55mDaily departures1
San Antonio - RomaAverage price£43Average duration5h 25mDaily departures1