SBS Transit Bus Service 138



SBS Transit Bus Service 138 is a trunk route running from Ang Mo Kio and looping at Mandai Lake Road (Singapore Zoo), going via Ang Mo Kio Avenue 3, 6 and 5, Upper Thomson and Mandai Road.

^ SBST Mercedes-Benz Citaro (SBS6658P) – Service 138

Route Information
Route Ang Mo Kio Bus Interchange ↺ Mandai Lake Road (Loop) 
Passes Through AMK Ave 3, 6, 5, Upper Thomson, Mandai Rd, Mandai Lake Rd
Route Length 27.2km
Travelling Time 70mins
Operator Information
Current Operator SBS Transit
Current Depot Ang Mo Kio Bus Depot (AMDEP)
Current Fleet Mercedes-Benz O530 Citaro
Scania K230UB
Departure Times from T1 0600 – 2345 (Daily)
Frequency Loop Service
0630-0830: 13 – 19 mins
0831-1659: 08 – 15 mins
1700-1930: 09 – 10 mins
After 1930: 10 – 15 mins

Route History

Service 138 serves as a connection between Ang Mo Kio Town Centre and the Singapore Zoo, River Safari and Night Safari along Mandai Lake Road, as well as Mandai Crematorium and Columbarium along Mandai Road. It also supplements bus connections for residents along Mandai Road and Ang Mo Kio Ave 5 to Ang Mo Kio Town Centre.

Demand for this route to and from Mandai Lake Road is high from tourists and locals alike, and concentrated around the late mornings, evenings and late nights in conjunction with opening hours of the Zoo, River Safari and Night Safari. During weekends, additional spare single-deck buses will be deployed to cater for higher demand, as well as the deployment of Shortworking Trip 138A which allows buses to return to Ang Mo Kio Int more quickly to pick up another load of passengers.

Special Departures:

  • Mandai Lake Rd (Singapore Zoo)  → Ang Mo Kio Int
    Saturdays & Eves of PHs: 1451hrs, 1503hrs, 1514hrs, 1533hrs, 1603hrs, 1615hrs, 1628hrs, 1638hrs, 1652hrs, 1724hrs, 1734hrs, 1744hrs, 1752hrs, 1809hrs, 1837hrs, 1857hrs
    Sundays & PH:
    1449hrs, 1500hrs, 1519hrs, 1549hrs, 1609hrs, 1619hrs, 1629hrs, 1640hrs, 1709hrs, 1727hrs, 1738hrs, 1746hrs, 1803hrs, 1824hrs, 1844hrs, 1905hrs
  • Ang Mo Kio Ave 5 (Blk 604)  Ang Mo Kio Int
    Weekdays: 0638hrs, 0706hrs, 0724hrs, 0743hrs, 0800hrs, 0823hrs, 0840hrs
    Sat & PH Eve: 0638hrs, 0705hrs, 0727hrs

Shortworking Trips:

  • Service 138A: Ang Mo Kio Int → Mandai Lake Road (Singapore Zoo)
    Weekends & Public Holidays, 0820hrs – 1225hrs
    Frequency of 6 – 24 mins
  • Service 138B: Ang Mo Kio Int → Ang Mo Kio Ave 5 (Opp Blk 604)
    Weekdays, 1830hrs – 2030hrs

Fare: Charges fares for regular trunk services. See Bus Fares for exact fares.

Fleet: Service 138′s fleet comprises single-deck Mercedes-Benz Citaros and Scania K230UBs. Double-deck buses are not deployed possibly due to road restrictions along Mandai Road and Mandai Lake Road.

Route Information:

Loop Service
  • Ang Mo Kio Int
  • Ang Mo Kio Ave 3
  • Ang Mo Kio Ave 6
  • Ang Mo Kio Ave 5
  • Yio Chu Kang Rd
  • Upp Thomson Rd
  • Mandai Rd
  • Mandai Lake Rd
  • Mandai Lake Rd
  • Mandai Rd
  • Upp Thomson Rd
  • Yio Chu Kang Rd
  • Ang Mo Kio Ave 5
  • Ang Mo Kio Ave 6
  • Ang Mo Kio Ave 3
  • Ang Mo Kio Int

Operator History:

  • 1994 – 2001: Singapore Bus Services Ltd
  • 2001 – Present: SBS Transit Ltd

The Bus Service Operating License (BSOL) for this route will be renewed in 2016.



  • 1994 (26 Apr): Introduced by SBS between Yio Chu Kang Ter and Singapore Zoological Gardens, with Service 171 skipping Mandai Lake Road.
  • 1994 (01 Oct): Extended to Ang Mo Kio Int via Ang Mo Kio Avenue 8.
  • 2002 (24 Mar): Enhanced to ply along Ang Mo Kio Avenue 3, 6 & 5, instead of along Ang Mo Kio Ave 8 & 5, to cover the deleted sectors of Service 269 when AMK Temp Int opened.
  • 2007 (28 Apr): Amended to air-conditioned Ang Mo Kio Integrated Transport Hub (ITH)
  • 2011 (26 Sep): Designated wheelchair-accessible bus route (WAB)
  • 2012 (01 Dec): Introduction of Shortworking trip 138A during Weekend/PH mornings
  • 2015 (19 Oct): Introduction of Shortworking trip 138B during Weekday evenings

Past Routings:

  • Refer to this article
  • 2002: Amended to present routing. No significant route changes since 2002.



SBS6626G – Service 138A SBS6662B – Service 138B


External Links & References:

  • TransitLink E-Guide
  • SGWiki – Buses

Back to Bus Services
Back to Bus Articles


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