By ship
Speed boats between Bandar Seri Begawan and Bangar run from 7am to 5pm. One way fares are $6 and the journey takes 45 minutes. The ride is quite interesting as the boats weave through the many river channels at the mouth of the Temburong and Brunei Rivers. Boats dock at the main jetty in town while in Bandar, they leave from the jetty near the foodstalls at Jalan Residency just east of the city centre across the Sungai Kianggeh bridge.
By road
As Temburong is separated from the rest of Brunei by Sarawak, you will have to go through Malaysian territory and past through four sets of immigration checkpoints to travel from Bandar Seri Begawan to Bangar. A main road runs from the Sarawak border at Puni Pandaruan on the Sarawak side in the west through Bangar Puni to Bangar: 5km, to the Labu border crossing in the east Labu to Bangar: 20km, where the road continues to Lawas. At Puni, there is a ferry bringing vehicles RM8 or B$4 across the Pandaruan River to the main road to Limbang 14km away. From Limbang, you can proceed to Bandar Seri Begawan via the Kuala Lurah-Tedungan border checkpoint.
Immigration formalities for those coming from Bandar Seri Begawan and Limbang have become easier with the opening of the Malaysian immigration checkpoint at Pandaruan near the ferry landing since June 2007. Previously, you had to get your Malaysian exit stamp at Limbang Wharf before going to Pandaruan. The Brunei checkpoint is about 600m from the ferry landing, and occupies a wooden one-storey building on the right south side of the road.
If coming from Lawas, you will have to get your Malaysia exit stamp at the Mengkalap Immigration and Customs office at Trusan before proceeding to the actual border about 8km away. The immigration office is located at a shoplot off the main road just east of the Trusan River ferry. Brunei's Labu checkpoint is at the actual border.
You will likely find yourself going through Temburong if you are travelling overland between the Malaysian states of Sabah and Sarawak. See Kota Kinabalu to Brunei in a day.
By taxi
Like buses, strict Bruneian laws prevent Malaysian taxis from bringing passengers into Temburong. From Limbang, you will have to catch a taxi to Pandaruan, cross the river by ferry or boat, then catch a Bruneian taxi to Bangar. If you are coming from Bandar Seri Begawan, you will have to find your way to Limbang first. Coming from the east, taxis run from Lawas to the Labu border checkpoint via Trusan where you have to get your Malaysian exit stamp. Change to a Bruneian taxi at Labu to get to Bangar.
By bus
There are no direct buses from Bandar Seri Begawan or any other part of Brunei to Temburong. Neither are there any direct buses to Temburong from neighbouring Sarawak.
To/from Bandar Seri Begawan or Limbang:
If you must take the bus there are direct speedboats to Bangar from Bandar, you will have to take the bus from Bandar Seri Begawan to Kuala Lurah see Brunei | Get in section for details and the catch another bus to Limbang. From Limbang, take a Pandaruan bus which will bring you to the border. Cross the Pandaruan River by ferry or boat and proceed to Bangar by taxi. You can get your Malaysian exit stamp at Pandaruan and your Brunei entry stamp at the Puni immigration post.To/from Lawas:
A local bus is supposed to go from Lawas to Trusan in Sarawak. This is as close as you will get to Temburong by bus and from there, you will have to take a Malaysian taxi to the Brunei-Malaysia border at Labu, and then change to a Bruneian taxi to Bangar. Get your Malaysian exit stamp at Trusan. The Bruneian entry stamp can be obtained at the border.