Southeastern Freight Lines. www.sefl.com. 9 executives to email now. Call Southeastern Freight Lines at +1 803 794 7300. Add an executive. Updated Mar 25, 2022. Southeastern Freight Lines News. Find out what works well at Southeastern Freight Lines from the people who know best. Get the inside scoop on jobs, salaries, top office locations, and CEO insights. Compare pay for popular roles and read about the team’s work-life balance. Uncover why Southeastern Freight Lines is the best company for you.