Academy Bus LLC operates a bus from Arlington to Culpeper 5 times a week. Tickets cost $17 - $19 and the journey takes 1 h 41 min. Alternatively, Metro Washington DC operates a train from Arlington to Culpeper every 10 minutes. Tickets cost $2 - $3 and the journey takes 6 min. 2 other operators also service this route.
From Arlington, VA - Rosslyn station bus to Culpeper, VA - Sports Complex then taxi to Culpeper. 1 h 45 min $21. From VIRGINIA SQUARE station subway to ROSSLYN station, subway to Alexandria Amtrak, then train to Culpeper Amtrak. 2 h 36 min $38. From Arlington drive to Culpeper. 1 h 20 min $7.