Hayreniq Tour operates a bus from Yerevan Hayreniq to Tbilisi Ortachala Bus Station 4 times a day. Tickets cost $13 - $35 and the journey takes 6h 5m. Alternatively, South Caucasus Railway operates a train from Yerevan to Tbilisi 4 times a week. Tickets cost $20 - $70 and the journey takes 10h 5m.