SMRT Bus Service 189


SMRT Bus Service 189 is a trunk route from Bukit Batok Interchange and looping at Clementi Avenue 1, passing through Bukit Batok Avenue 1, Street 23, AYE, Clementi Avenue 6 and Clementi MRT.

^ SMRT MAN NL323F (SMB3003H) – Service 189

Route Information
Route Bukit Batok Bus Interchange  Clementi Avenue 1 (Loop)  
Passes Through Bukit Batok Ave 1, St 23, AYE, Clementi Ave 6, Clementi MRT
Route Length 16.4km
Travelling Time 70 – 75mins
Operator Information
GCM Route Package
Bulim Bus Package
Current Operator SMRT Buses
Current Depot Kranji Bus Depot (KJDEP)
Current Fleet 12-metre Double Deck Bus:
Alexander Dennis Enviro500
12-metre Single Deck Bus:

Departure Times from T1 Daily:
0545 – 2315 (Full loop)
2320 – 0100 (Service 189A | Terminates at Bukit Batok St 23 (Opp Midview Bldg))
Frequency Loop Service
0630-0830: 04 – 10 mins
0831-1659: 04 – 12 mins
1700-1930: 08 – 11 mins
After 1930: 10 – 20 mins
Notes * From 2330 to 0050 daily, buses leaving Bukit Batok Int will operate as 189A and terminate at Bukit Batok Street 23 (Opp Midview Building)

Route History

Service 189 is a inter-town route serving between Bukit Batok and looping at Clementi, via Bukit Batok Neighbourhood 2, Bukit Batok Street 23, Clementi Avenue 6, Clementi MRT and Clementi Avenue 1.

The route is well patronized between the industrial areas around Bukit Batok Street 23 and Bukit Batok MRT, with Shortworking trip 189A performing supplementary trips during Weekdays AM Peak, and scheduled mid-route departures (“downroutes”) in the reverse direction during Weekdays PM Peak. The sector between Clementi MRT and Clementi Ave 1 receives moderate demand due to the area’s presently limited residential developments, but encounters high demand from students heading to the educational institutions along Clementi Avenue 1.

Formerly a Singapore Bus Service (SBS) route since the 1970s, the route was transferred to Trans-Island Bus Service (TIBS) in 2000 and has been operated by SMRT ever since. High capacity articulated buses are deployed during weekday peak hours, and double-deck buses were deployed since 26 October 2015.

In 2014, Service 189 was involved in a small scale bus loading trial where buses were equipped with electronic displays beside the front door, which indicates when the next bus will arrive and the passenger loading onboard that bus.


2014 Route Amendment:

From 23 November 2014, Service 189 will be amended to loop at Clementi Avenue 1, skipping existing stops along Clementi Avenue 2, West Coast Road and Kent Ridge Terminal. Deleted sectors will be covered by the new Service 201, operated by SBS Transit and introduced (on the same day) under the Bus Service Enhancement Programme (BSEP).

The new sector along Clementi Avenue 1 will serve NUS High School, Nan Hua High School and nearby residential apartments with connections to Clementi Town Centre. Two new bus stops will be built along the road, which was previously not served by any public bus service.

Last bus departing Bukit Batok Interchange was also extended to 11:15pm daily.


Special Departures:

  • Bukit Batok St 23 (Midview Building) Bukit Batok Int
    Weekdays PM Peak

Shortworking Trips:

  • Service 189A: Bukit Batok Int → Bukit Batok St 23 (Opp Midview Building)
    Weekdays AM Peak (0706 – 0900)
    Daily (2320 – 0100)

From 2320 daily, buses will be renamed as 189A and terminate at Bukit Batok Street 23, Opp Midview Building.

During Eves of Public Holidays, last bus timings of Service 189 (operating as Service 189A) will be extended to complement the extension of train operating hours.

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

Fleet: See Above

Route Information:

Loop Service (via Clementi Ave 1)
  • Bt Batok Int
  • Bt Batok Central
  • Bt Batok Ave 1
  • Bt Batok East Ave 6
  • Bt Batok St 23
  • Bt Batok East Ave 3
  • Clementi Ave 6
  • Commonwealth Ave West
  • Clementi Ave 2
  • Clementi Road
  • Clementi Ave 1
  • Commonwealth Ave West
  • Clementi Ave 6
  • Bt Batok East Ave 3
  • Bt Batok St 23
  • Bt Batok East Ave 6
  • Bt Batok Ave 1
  • Bt Batok Central
  • Bt Batok Int

Operator History:

  • 1971 – 1973: Amalgamated Bus Company Pte Ltd
  • 1973 – 2000: Singapore Bus Services Ltd
  • 2000 – 2004: Trans-Island Bus Services Ltd
  • 2004 – Present: SMRT Buses Ltd

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





  • 1974 (03 Feb): Introduced by SBS, plying between Commonwealth Ave/North Buona Vista Rd and South Canal
  • 1979 (15 Jan): Amended to loop at Empress Place
  • 1981: Amended to Buona Vista Ter
  • 1985: Amended to start from Bukit Batok and terminate at Marina Centre Ter
  • 1987: No longer plies Beach Rd in the direction of Bukit Batok
  • 1990: Shortened to loop at Clementi West Street 2
  • 1995: Extended to loop at West Coast Ferry Terminal.
  • 1996: Amended to ply PIE and Clementi Ave 6, skipping Toh Tuck Ave
  • 2000 (18 Jun): Handed to Trans-Island Bus Services (TIBS) 
  • 2001 (15 Apr): Shortened to loop at Kent Ridge Terminal. Service 189A introduced between Bt Batok Int and West Coast Ferry Ter (Loop), operating at selected timings.
  • 2003: Service 189A withdrawn
  • 2009 (01 Jun): Designated wheelchair-accessible bus route (WAB)
  • 2014 (23 Jun): Bus Service Reliability Framework (BSRF) implemented for a two-year trial
  • 2014 (23 Nov): Shortened to loop at Clementi Ave 1 via AYE and Clementi Rd Lost sectors along West Coast Rd replaced by Service 201.
  • 2015 (05 Jun): BSRF trial extended to Aug 2016
  • 2015 (26 Oct): Start of Alexander Dennis Enviro500 Double-Decker Bus Deployments. Full fleet redeployment for GCM Bulim Package handover to Tower Transit.

Past Routings:


External Links & References:

Back to Bus Services
Back to Bus Articles


7 thoughts on “SMRT Bus Service 189

    • I agree with that, and I have also observed large numbers of passengers transferring between 189 and 201 at Clementi MRT. LTA probably wanted to introduce additional bus connections between Clementi MRT and Avenue 1 / Teban Gardens, but couldn’t go about creating a service from Kent Ridge via Clementi Avenue 1 due to the current road alignment, hence the amendment to 189 instead (and the new Service 201 to cover its deleted sectors).

      Do note that LTA has taken the role of central bus planner and PTOs SBST & SMRT have little say in route amendments of any sort.

  1. 189 shouldn’t have double deck. saw it today on ave 6 and got nobody on upper deck but lower deck full. the peak part is st 23 and is very near to int shd hv long bus instead and then non peak period can transfer to another bus with higher demand

  2. Most of the people taking from Clementi Station onwards heading to Clementi Ave 1 are students.
    The fare is capped at $0.61 for students. Thus, they might have taken feeder service + MRT + 189, thus the 189 ride is free.
    The authorities should consider this problem, as service 189 might be loosing money.
    Then again, they can revert 189 back to its original route, and replace it with a trunk service which serves areas that are in high demand.

    • Agree. 189 should be reverted, while 201 should be rerouted. A new bus service should be implemented to serve residents of Clementi Ave 1, possibly looping there like 189. But 189 is not losing money as you see the huge crowds during the morning peak hours going to the industrial area.

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