All buses to Vang Vieng, Laos
Bus from Hanoi to Vang Vieng
https://vietlaobus.com/en/bus-hanoi-vangvieng.html
The local bus leaves from Da Laat Sao (The morning market) bus station. They leave at 6am, 7am, 9am, 11am, 12.30 pm and 2pm. It takes about 4 to 5 hours for the journey and costs 40, 000 kip. There are also Songthaews that leave from the Songthaew station north of the city, which go every 20 minutes. When arriving in Vang Vieng the buses and Songthaews will stop by the side of the airfield so make sure you get off here, the bus then goes 3km north to the bus station.
There are also a few Mini Buses that leave from near to the bus station and leave when they are full. The journey should cost 60, 000 kip.
The Thavonsouk Bus Company and Malany Bus Company leaves from opposite the National Cultural Hall at 10am and 2pm. The journey for both these companies takes about 3 and a half hours. Tickets can be booked through many of the guesthouses or tour operators in Vientiane.
Tickets cost 60, 000 kip.
Buses from Vang Vieng to Vientiane.
The local bus leaves from the Norhtern Bus Station, you can eiter catch the bus from there or by the side of the road next to the old air field. They leave at 5.30am, 6am, 6.30am, 7am, 12.30 pm and 2pm. It takes about 4 to 5 hours for the journey and costs 40, 000 kip. There are also Songthaews available from the bus station or the airfield which leave for Vientiane every 20 mins or so, the cost is 40, 000 kip.
The Thavonsouk Bus Company and Malany Bus Company leave at 10am and 1.30pm. They have a free pick up service from the guesthouse. The journey for both these companies takes about 3 and a half hours. Tickets can be booked through many of the guesthouses or tour operators in Vang Vieng and cost 60, 000 kip.
Mini Buses can also be booked through tour operators in Vang Vieng. They leave at 9am and cost 70, 000 kip.