The first stage of the expressway started as a continuous road from the Central Expressway and ended at Upper Thomson Road.
On 13 April 1989, the Seletar Expressway was opened from Lentor Avenue to Upper Thomson Road.
Later on, this stretch was opened on 24 March 1990 to connect SLE and CTE.
Later, it was extended from Upper Thomson Road to the BKE.
It replaced various roads - Lorong Handalan, Lorong Lentor, Lorong Selangin and Lorong Hablor.

The SLE is a six-lane dual carriageway.
The Upper Thomson Road - BKE extension was opened in two parts: from BKE to Woodlands Avenue 2 on 5 November 1995, and from Woodlands Avenue 2 to Upper Thomson Road on 22 February 1998.
Construction of the second phase began in 1992.
The interchange of SLE and BKE was completed in 1994.
The third stage of construction, completing in July 1996 from Woodlands Avenue 2 to Lorong Gambas.
The final phase involved the construction from Lorong Gambas to Upper Thomson Road.
The last sector of this expressway which opened was the last completed expressway project in Singapore until the opening of a section of the Kallang–Paya Lebar Expressway on 28 October 2007.

It had the largest clearing of the roads in the history - Lorong Gambas, Jalan Ulu Sembawang, and some dirt tracks.
The first stage of the expressway started as a continuous road from the Central Expressway and ended at Upper Thomson Road. On 13 April 1989, the Seletar Expressway was opened from Lentor Avenue to Upper Thomson Road. Later on, this stretch was opened on 24 March 1990 to connect SLE and CTE. Later, it was extended from Upper Thomson Road to the BKE. It replaced various roads - Lorong Handalan, Lorong Lentor, Lorong Selangin and Lorong Hablor.
The SLE is a six-lane dual carriageway. The Upper Thomson Road - BKE extension was opened in two parts: from BKE to Woodlands Avenue 2 on 5 November 1995, and from Woodlands Avenue 2 to Upper Thomson Road on 22 February 1998. Construction of the second phase began in 1992. The interchange of SLE and BKE was completed in 1994. The third stage of construction, completing in July 1996 from Woodlands Avenue 2 to Lorong Gambas. The final phase involved the construction from Lorong Gambas to Upper Thomson Road. The last sector of this expressway which opened was the last completed expressway project in Singapore until the opening of a section of the Kallang–Paya Lebar Expressway on 28 October 2007.
It had the largest clearing of the roads in the history - Lorong Gambas, Jalan Ulu Sembawang, and some dirt tracks.
Seletar Expressway