Mongar is best reached through road. One can either take a bus from Thimphu or Samdrup Jongkhar, which both have daily bus services to Mongar.
Nearest Airport is Paro International Airport which is more than 400 kilometres away.
If you are driving from Thimphu or Samdrup Jongkhar, then you can take Bumthang - Ura Highway. The drive takes around 13 hours from Thimphu and 21 hours from Samdrup. From Trashigang, it takes around two to three hours if you are going via Mongar - Trashigang - Trashiyangtse Road.
From Thimphu, it takes around 10.5 hours to reach Mongar, leaving at 7:00 AM. From Samdrup Jongkhar, buses run from Monday to Saturday, taking about 11 hours to arrive here. From Trashigang, the buses reach Mongar in about 5 hours only and from Lhuentse, it takes about 4 hours.
The town is hardly a few streets and can be very easily covered on foot.