VISA : Visa on Arrival / E-Visa are required. Please check rules here https://www.laoevisa.gov.la/index
BORDER CROSSING
Passengers will travel in a bus from Bangkok to Nong Khai Bus Station where a Tara Tour staff member will pick them up in a Tuk Tuk and take them to the Thai-Laos border. At the border crossing, passengers need to get a stamp in their passports from the Thai immigration and then cross the Thai–Lao Friendship Bridge towards the Laos immigration to get their Laos visa. Once they've passed through Laos immigration, they can wait there for the bus to pick them up.
Economy Bus by Khao San Tara Tour | Bookaway