History of Services 101 - 110

Service 101 (1971 - 1990)

Operator	Year	Date	Service changes
STC	1971	11 April	Introduced between Serangoon Gdn Ter and New Bridge Rd Ter under 1971 Bus Reorganisation.
ABS		6 December	Operations transferred to ABS.
	1972	18 June	Amended to ply Bendemeer Rd towards New Bridge Rd Ter with the conversion of Serangoon Rd to one-way traffic.
	1974	1 October	Serves new merged bus stop outside Sri Srinivasa Perumal Tp along Serangoon Rd.
	1977	31 October	Amended to skip Chartwell Dr, Burghley Dr and Berwick Dr with the introduction of Service 217.
	1981	10 May	Skips bus stop before Braddell Flyover along Lor Chuan.
	1983	6 February	Amended to ply CTE towards Serangoon Gdn Ter with the closure of temporary slip road between Braddell Rd and Lor Chuan.
		20 June	Amended back to ply Lor Chuan towards Serangoon Gdn Ter with the opening of new link road between Braddell Rd and Lor Chuan under Braddell Flyover.
	1985	TBC	Amended to loop at New Bridge Rd.
	1987	3 May	Amended to terminate at New Bridge Rd Ter.
		6 June	Amended to the relocated New Bridge Rd Ter.
		27 September	Amended to ply the extended Eu Tong Sen St towards Serangoon Gdn Ter to facilitate the first stage of road expansion along New Bridge Rd.
		1 November	Amended to ply Eu Tong Sen St towards Serangoon Gdn Ter to facilitate the second stage of road expansion along New Bridge Rd.
	1988	13 March	Amended to Serangoon Int.
		20 March	Amended to ply Upp Cross St and New Bridge Rd, skipping Neil Rd.
	1990	2 September	Integrated with Service 83 and discontinued.

Service 101 (since 2004)

Operator	Year	Date	Service changes
(Current)	2004	15 February	Introduced between Serangoon Int and Buangkok Cres (Loop), replacing Service 328.
	2005	14 August	Amended to loop at Buangkok Lk, skipping Buangkok Cres.
	2009	19 April	Serves new pair of bus stops outside Blk 834 and outside Hougang Polyclinic along Hougang Ave 4.
	2011	3 September	Amended to Serangoon Integrated Transport Hub.
		3 December	Designated wheelchair-accessible bus service (WAB).
	2017	9 July	Serves new pair of bus stops outside and opposite Blk 991B along Buangkok Lk.
	2018	23 December	Serves new bus stop opposite Blk 984A along Buangkok Lk.
	2019	25 August	Amended to loop at Buangkok Cres after Buangkok Lk.
	2022	13 March	Serves new bus stop outside Blk 991A along Buangkok Cres.

Service 101A (1971 - 1974)

Operator	Year	Date	Service changes
STC	1971	11 April	Introduced between Serangoon Gdn Ter and New Bridge Rd Ter under 1971 Bus Reorganisation.
ABS		6 December	Operations transferred to ABS.
	1972	18 June	Amended to ply Bendemeer Rd towards New Bridge Rd Ter with the conversion of Serangoon Rd to one-way road.
	1974	3 February	Discontinued under 1974 Bus Rationalisation.

Service 102 (1971 - 1977)

Operator	Year	Date	Service changes
STC	1971	11 April	Introduced between Serangoon Gdn Ter and Prince Edward Ter under 1971 Bus Reorganisation.
UBC		6 December	Operations transferred to UBC.
	1972	18 June	Amended to ply Bendemeer Rd towards Prince Edward Ter with the conversion of Serangoon Rd to one-way traffic.
	1974	3 February	Converted to semi-express service under 1974 Bus Rationalisation.
		8 December	Amended to ply the extended Robinson Rd, skipping Market St.
	1976	15 February	Serves new staggered bus stop between Bank of India and Hong Leong Holdings along Robinson Rd.
		14 March	Serves new staggered bus stop outside The Cenotaph along Connaught Dr, skipping the bus stop opposite Singapore Cricket Club.
	1977	31 October	Discontinued.

Service 102 (1981 - 1983)

Operator	Year	Date	Service changes
	1981	2 March	Introduced between Jln Kayu Ter and New Bridge Rd Ter, operating on weekdays and Saturdays only.
	1983	14 November	Discontinued.

Service 102 (since 2015)

Operator	Year	Date	Service changes
(Current)	2015	20 September	Introduced between Hougang Ctrl Int and Jln Kayu (Loop) under the LTA's Bus Service Enhancement Programme (BSEP), operating between 0545 hrs and 2330 hrs daily. Wheelchair-accessible at launch.
	2018	14 October	Extended to loop at Seletar Airport PTB.
	2019	22 September	Serves new pair of bus stops opposite and after Seletar Camp along Seletar Aerospace Dr.
	2022	29 May	Amended to ply Fernvale Rd, Sengkang West Ave, Sengkang West Rd and Sengkang West Way, skipping a portion of Sengkang West Way.
			First bus brought forward to 0530 hrs daily.

Service 102A (1971 - 1974)

Operator	Year	Date	Service changes
STC	1971	11 April	Introduced between Serangoon Gdn Ter and Prince Edward Ter under 1971 Bus Reorganisation.
UBC		6 December	Operations transferred to UBC.
	1972	18 June	Amended to ply Bendemeer Rd towards Prince Edward Ter with the conversion of Serangoon Rd to one-way traffic.
	1974	3 February	Re-numbered Service 105 under 1974 Bus Rationalisation.

Short Trip 102A (since 2023)

Operator	Year	Date	Service changes
(Current)	2023	27 March	Introduced as a short-trip service from Sengkang East Way (Sengkang Stn) to Sengkang West Way (Opp Blk 461B) during evening peak hours on weekdays. Wheelchair-accessible at launch.

Short Trip 102B (since 2023)

Operator	Year	Date	Service changes
(Current)	2023	9 October	Introduced as a short-trip service from Sengkang West Way (Blk 461B) to Sengkang East Way (Opp Sengkang Stn/Blk 260A) during morning peak hours on weekdays. Wheelchair-accessible at launch.

Service 103

Operator	Year	Date	Service changes
ABS	1971	11 April	Introduced between Serangoon Gdn Ter and Commonwealth Ave Ter under 1971 Bus Reorganisation.
	1972	18 June	Amended to ply Bendemeer Rd towards Commonwealth Ave Ter with the conversion of Serangoon Rd to one-way traffic.
	1974	3 February	Extended to Jln Kayu Ter under 1974 Bus Rationalisation.
		1 October	Serves new merged bus stop outside Sri Srinivasa Perumal Tp along Serangoon Rd.
	1975	2 February	Amended to ply new slip road from Tiong Bahru Rd to Outram Rd with the conversion of Seng Poh Rd to one-way traffic.
		2 November	Amended to temporary bus terminal along Holland Dr with the partial closure of Commonwealth Ave Ter to facilitate the extension of Commonwealth Ave.
	1977	29 August	Amended back to Commonwealth Ave Ter via Nth Buona Vista Rd.
	1980	13 July	Amended to ply Commonwealth Ave with the conversion of Queens Circus to a signalised junction, skipping Queensway and Holland Rd.
	1982	27 May	Amended to Buona Vista Ter.
	1987	6 April	Skips abolished bus stop before College Rd along Outram Rd.
		27 September	Amended to ply the extended Eu Tong Sen St towards Jln Kayu Ter to facilitate the first stage of road expansion along New Bridge Rd.
		1 November	Amended to ply Eu Tong Sen St to facilitate the second stage of road expansion along New Bridge Rd.
		13 December	Serves new staggered bus stop opposite Peninsula Plaza along Nth Bridge Rd, skipping the bus stop outside St Andrew's Cath.
	1989	29 January	Serves relocated bus stop opposite Sri Mariamman Tp along Sth Bridge Rd, skipping abolished bus stop opposite Jamae Mque.
	1992	29 March	Shortened to New Bridge Rd Ter under TransitLink Network Integration Exercise Phase 6.
	1995	17 December	Operations transferred to TIBS.
	1998	TBC	Skips a pair of temporarily abolished bus stops before and after Seletar West Farmway 1 along Jln Kayu.
	1999	10 July	Skips the bus stop outside Plaza By The Pk along Bras Basah Rd.
		26 December	Operations transferred to SBS.
	2001	15 July	Amended to ply Yio Chu Kang Lk and Boundary Rd.
(Current)	2002	TBC	Serves new pair of bus stops after Sommerville Rd and after Sunshine Lodge along Upp Serangoon Rd.
		31 December	Serves reinstated pair of bus stops before and after Sengkang West Ave along Jln Kayu.
	2003	20 June	Serves new pair of bus stops outside Potong Pasir Stn along Upp Serangoon Rd.
		7 December	Shortened to start from Serangoon Int and loop at Piccadilly, replacing Service 378 under North East MRT Line Rationalisation Phase 3.
	2007	1 July	Skips abolished bus stop after East Camp Gate along Piccadilly.
	2011	13 February	Integrated with Service 103M and extended to loop at West Camp Rd.
		3 September	Amended to Serangoon Integrated Transport Hub.
	2012	2 February	Serves new pair of bus stops before and after Rolls Royce Pte Ltd along Seletar Aerospace Dr.
	2013	13 October	Amended to ply Sengkang West Ave and Sengkang West Rd with the partial closure of Jln Kayu.
	2014	3 December	Designated wheelchair-accessible bus service (WAB).
	2015	14 June	Extended to Yishun Temp Int under the LTA's Bus Service Enhancement Programme (BSEP).
	2018	25 November	Serves 3 new bus stops before and opposite Blk 469B and opposite Yishun St 43 along Yishun Ave 1.
	2019	8 September	Amended to Yishun Integrated Transport Hub.
	2020	12 January	Serves new bus stop outside Blk 469B along Yishun Ave 1.
	2022	26 June	Serves new bus stop outside Blk 471A along Yishun Ave 1.

Service 103A (1971 - 1974)

Operator	Year	Date	Service changes
ABS	1971	11 April	Introduced between Serangoon Gdn Ter and Commonwealth Ave Ter under 1971 Bus Reorganisation.
	1972	18 June	Amended to ply Bendemeer Rd towards Commonwealth Ave Ter with the conversion of Serangoon Rd to one-way traffic.
	1974	3 February	Re-numbered Service 106 under 1974 Bus Rationalisation.

Service 103W/103M (2003 - 2011)

Operator	Year	Date	Service changes
	2003	7 December	Introduced between Serangoon Int and West Camp Rd (Loop) as Service 103W, replacing Service 379 under North East MRT Line Rationalisation Phase 3.
	2008	28 January	Re-numbered Service 103M.
	2011	13 February	Integrated with Service 103 and discontinued with the partial closure of West Camp Rd and New West Camp Rd.

Service 104 (1971 - 1993)

Operator	Year	Date	Service changes
UBC	1971	23 April	Introduced between Serangoon Gdn Ter and Upp Cross St (Loop).
		5 July	Amended to ply Chartwell Dr, Burghley Dr, Berwick Dr and Serangoon Gdn Way towards Upp Cross St.
	1972	11 June	Amended to ply the extended Upp Cross St with the partial conversion of Havelock Rd to one-way traffic, skipping New Bridge Rd.
	1973	11 March	Amended to ply Hoot Kiam Rd towards Serangoon Gdn Ter with the conversion of Irwell Bank Rd to one-way traffic.
	1977	31 October	Amended to skip Chartwell Dr, Burghley Dr and Berwick Dr with the introduction of Service 217.
	1983	6 February	Amended to ply CTE towards Serangoon Gdn Ter with the closure of temporary slip road between Braddell Rd and Lor Chuan.
		20 June	Amended back to ply Lor Chuan towards Serangoon Gdn Ter with the opening of new link road between Braddell Rd and Lor Chuan under Braddell Flyover.
	1986	28 September	Amended to ply Keng Lee Rd, Kg Java Rd and Bt Timah Rd, skipping Cavenagh Rd.
	1987	13 December	Serves new bus stop outside Newton Stn along Scotts Rd.
	1988	13 March	Amended to Serangoon Int.
	1992	3 May	Extended to New Bridge Rd Ter and amended to ply Ang Mo Kio Ave 1 and Bishan Rd under TransitLink Network Integration Exercise Phase 7, skipping Lor Chuan.
	1993	5 December	Integrated with Service 134 to form Service 54 and discontinued under TransitLink Network Integration Exercise Phase 14.

Service 105 (1974 - 1977)

Operator	Year	Date	Service changes
	1974	3 February	Re-numbered from Service 102A as a service between Serangoon Gdn Ter and Prince Edward Ter.
		8 December	Amended to ply the extended Robinson Rd, skipping Market St.
	1976	15 February	Serves new staggered bus stop between Bank of India and Hong Leong Holdings along Robinson Rd.
		14 March	Serves new staggered bus stop outside The Cenotaph along Connaught Dr, skipping the bus stop opposite Singapore Cricket Club.
	1977	31 October	Discontinued.

Service 105 (since 1988)

Operator	Year	Date	Service changes
	1988	13 March	Introduced between Serangoon Int and Clementi Int, replacing Service 95.
	1991	1 April	First bus from Serangoon Int brought forward to 0545 hrs on weekdays and Saturdays.
	1992	29 March	Extended to Jurong East Int under TransitLink Network Integration Exercise Phase 6.
		3 May	Integrated with Service 312 and amended to ply Serangoon Ave 2, Serangoon Ave 3 and Lor Chuan under TransitLink Network Integration Exercise Phase 7.
	1993	5 December	Amended to ply Queensway, Commonwealth Ave and Commonwealth Ave West under TransitLink Network Integration Exercise Phase 14, skipping Ulu Pandan Rd and Clementi Rd.
	1997	TBC	Serves new pair of bus stops outside Blk 286A and outside Blk 284 along Toh Guan Rd.
	1999	TBC	Skips temporarily abolished bus stops outside and opposite Sch of Mechanical & Mfg along Commonwealth Ave West.
	2000	TBC	Last bus from Jurong East Int extended to 2400 hrs on Saturdays.
	2001	18 October	Serves reinstated bus stops outside Dover Stn along Commonwealth Ave West.
(Current)	2009	5 July	Amended to ply Boon Lay Way with the closure of Jurong East St 12 to facilitate the Jurong East Modification Project (JEMP).
	2011	3 September	Amended to Serangoon Integrated Transport Hub, skipping Boundary Rd with the route amendment of Service 109.
		17 December	Amended to Jurong East Temp Int.
	2012	26 March	Designated wheelchair-accessible bus service (WAB).
	2020	6 December	Amended to relocated Jurong East Temp Int and serve new bus stop before Jurong East Stn along Jurong Gateway Rd.

Short Trip 105A (1999 - 2011)

Operator	Year	Date	Service changes
	1999	TBC	Introduced from Serangoon Int to Whitley Rd (Aft Tanglin CC) during morning peak hours on weekdays.
	2003	TBC	Shortened to terminate at Lor 2 Toa Payoh (Toa Payoh Stn).
	2011	TBC	Discontinued.

Short Trip 105B

Operator	Year	Date	Service changes
	1999	TBC	Introduced from Jurong East Int to Commonwealth Ave West (Clementi Stn) during morning peak hours on weekdays.
(Current)	2009	5 July	Amended to ply Boon Lay Way with the closure of Jurong East St 12 to facilitate the Jurong East Modification Project (JEMP).
	2011	17 December	Amended to Jurong East Temp Int.
	2012	26 March	Designated wheelchair-accessible bus service (WAB).
	2020	6 December	Amended to relocated Jurong East Temp Int.

Service 106

Operator	Year	Date	Service changes
	1974	3 February	Re-numbered from Service 103A as a service between Serangoon Gdn Ter and Commonwealth Ave Ter.
		1 October	Serves new merged bus stop outside Sri Srinivasa Perumal Tp along Serangoon Rd.
	1977	17 May	Amended to ply Commonwealth Ave Extension and Nth Buona Vista Rd towards Commonwealth Ave Ter.
		29 August	Amended to ply Holland Ave, Holland Dr and Nth Buona Vista Rd towards Commonwealth Ave Ter.
		31 October	Amended to skip Chartwell Dr, Burghley Dr and Berwick Dr with the introduction of Service 217.
		7 November	Amended to ply Penang Rd, Somerset Rd, Grange Rd, Orchard Rd/Orchard Blvd, Tanglin Rd, Napier Rd, Holland Rd and Holland Ave, skipping Bras Basah Rd, Nth Bridge Rd/Hill St, Sth Bridge Rd, Upp Circular Rd, New Bridge Rd, River Valley Rd, Delta Rd, Alexandra Rd, Tanglin Rd, Margaret Dr, Queensway and Commonwealth Dr.
	1982	27 May	Amended to Buona Vista Ter.
	1983	6 February	Amended to ply CTE towards Serangoon Gdn Ter with the closure of temporary slip road between Braddell Rd and Lor Chuan.
		20 June	Amended back to ply Lor Chuan towards Serangoon Gdn Ter with the opening of new link road between Braddell Rd and Lor Chuan under Braddell Flyover.
	1985	28 October	Extended to Bt Batok Ter.
	1986	31 August	Serves additional bus stop outside Blk 9 along Holland Ave.
	1987	27 September	Amended to Bt Batok Int.
	1988	13 March	Amended to Serangoon Int.
	1992	19 July	Amended to ply Orchard Lk due to the closure of Grange Rd to facilitate road expansion works.
	1999	TBC	Skips temporarily abolished bus stops outside and opposite Sch of Mechanical & Mfg along Commonwealth Ave West.
	2000	24 December	Operations transferred to TIBS.
	2001	18 October	Serves reinstated bus stops outside Dover Stn along Commonwealth Ave West.
	2002	7 July	Skips the bus stop opposite Mandarin Singapore along Orchard Rd.
		TBC	Serves new pair of bus stops after Sommerville Rd and after Sunshine Lodge along Upp Serangoon Rd.
	2003	20 June	Serves new pair of bus stops outside Potong Pasir Stn along Upp Serangoon Rd.
		27 July	Shortened to Marina Ctr Ter under North East MRT Line Rationalisation Phase 2.
	2005	2 July	Amended to ply Grange Rd with the partial closure of Somerset Rd.
	2010	26 April	Extended to Shenton Way Ter.
	2013	1 December	Serves new bus stop outside Downtown Stn along Central Blvd.
	2014	28 September	Amended to ply Robinson Rd and Marina Blvd towards Bt Batok Int, skipping Maxwell Rd and Central Blvd with the road changes in the Marina Sth area.
	2015	14 June	Designated wheelchair-accessible bus service (WAB).
(Current)	2016	29 May	Operations transferred to Tower Transit Singapore.
	2017	25 June	Amended to the relocated Shenton Way Ter.

Short Trip 106A (2001 - 2003)

Operator	Year	Date	Service changes
	2001	TBC	Introduced from Bt Batok Int to Commonwealth Ave West (Opp SP T1A) during morning peak hours on weekdays.
	2003	TBC	Discontinued.

Short Trip 106A (since 2012)

Operator	Year	Date	Service changes
	2012	17 September	Introduced from Bt Batok Int to Commonwealth Ave West (Clementi Stn) during morning peak hours on weekdays.
	2015	14 June	Designated wheelchair-accessible bus service (WAB).
(Current)	2016	29 May	Operations transferred to Tower Transit Singapore.

Service 107

Operator	Year	Date	Service changes
	1978	23 January	Introduced between Serangoon Gdn Ter and Shenton Way (Loop) as a semi-express service on weekdays and Saturdays, replacing Blue Arrow Service 304.
	1979	11 February	Amended to ply the extended Shenton Way, Keppel Rd and Anson Rd, skipping Parsi Rd.
	1981	10 May	Skips bus stop before Braddell Flyover along Braddell Rd.
		11 October	Serves new staggered bus stop outside Tunas Bldg along Anson Rd, skipping the bus stop outside Intl Plaza.
	1983	6 February	Amended to ply CTE towards Serangoon Gdn Ter with the closure of temporary slip road between Braddell Rd and Lor Chuan.
		20 June	Amended back to ply Lor Chuan towards Serangoon Gdn Ter with the opening of new link road between Braddell Rd and Lor Chuan under Braddell Flyover.
	1988	3 January	Serves new staggered bus stop opposite Treasury Bldg along Shenton Way, skipping the bus stop opposite Marina Hse.
		13 March	Amended to Serangoon Int, converted to full day trunk service and amended to ply Kallang Bahru and Marina Ctr.
	1989	11 June	Amended to skip Marina Ctr.
	1994	3 July	Amended to ply Kallang Rd, Victoria St and Jln Sultan towards Shenton Way, skipping Crawford St.
	1997	23 March	Converted to day service with the introduction of Service 107X.
	2001	TBC	Last bus revised to 1330 hrs on Saturdays.
(Current)	2002	TBC	Serves new pair of bus stops after Sommerville Rd and after Sunshine Lodge along Upp Serangoon Rd.
	2003	4 May	Amended to ply Geylang Bahru, Bendemeer Rd, Whampoa East and Serangoon Rd, skipping Jln Kolam Ayer.
		20 June	Serves new pair of bus stops outside Potong Pasir Stn along Upp Serangoon Rd.
		30 November	Extended to Hougang Ctrl Int and amended to Shenton Way Ter under North East MRT Line Rationalisation Phase 3, replacing the deleted sectors of Service 97.
	2007	28 April	Serves additional bus stop outside Victoria Concert Hall along Fullerton Rd.
	2009	27 December	Serves the bus stop opposite Singapore Cricket Club along Connaught Dr with the abolition of the bus stop outside Esplanade Pk.
	2015	3 December	Designated wheelchair-accessible bus service (WAB).
	2016	1 May	Amended to ply Esplanade Dr with the partial closure of Fullerton Rd.
	2017	25 June	Amended to the relocated Shenton Way Ter.
	2021	7 February	Amended to ply Bidadari Pk Dr, skipping a portion of Upp Serangoon Rd.
		26 December	Amended to ply Esplanade Dr towards Shenton Way Ter with the closure of Connaught Dr.
	2022	28 August	Temporarily amended to ply Hougang Ctrl and Hougang Ave 4 with the partial closure of Hougang Ctrl to facilitate the construction of the Cross-Island MRT Line.

Short Trip 107A (2000 - 2003)

Operator	Year	Date	Service changes
	2000	TBC	Introduced from Serangoon Int to Shenton Way (Opp Temasek Twr) during morning peak hours on weekdays.
	2003	30 November	Discontinued with the amendment of Service 107 to Shenton Way Ter under North East MRT Line Rationalisation Phase 3.

Service 107X/107M

Operator	Year	Date	Service changes
	1997	23 March	Introduced between Serangoon Int and Raffles Blvd (Loop) as an alternate route of Service 107, operating during off peak periods on weekdays and Saturdays and throughout the day on Sundays and Public Holidays, numbered as Service 107X.
	2001	TBC	First bus brought forward to 1340 hrs on Saturdays.
(Current)	2002	TBC	Serves new pair of bus stops after Sommerville Rd and after Sunshine Lodge along Upp Serangoon Rd.
	2003	4 May	Amended to ply Geylang Bahru, Bendemeer Rd, Whampoa East and Serangoon Rd, skipping Jln Kolam Ayer.
		20 June	Serves new pair of bus stops outside Potong Pasir Stn along Upp Serangoon Rd.
		30 November	Extended to Hougang Ctrl Int under North East MRT Line Rationalisation Phase 3, replacing the deleted sectors of Service 97.
	2008	28 January	Re-numbered Service 107M.
	2015	3 December	Designated wheelchair-accessible bus service (WAB).
	2021	7 February	Amended to ply Bidadari Pk Dr, skipping a portion of Upp Serangoon Rd.
	2022	28 August	Temporarily amended to ply Hougang Ctrl and Hougang Ave 4 with the partial closure of Hougang Ctrl to facilitate the construction of the Cross-Island MRT Line.

Service 109

Operator	Year	Date	Service changes
(Current)	2006	28 May	Introduced between Serangoon Int and Changi Village Ter, operating between 0600 hrs and 2330 hrs from Serangoon Int and Changi Village Ter daily.
		TBC	First bus from Serangoon Int brought forward to 0545 hrs on weekdays.
	2011	3 September	Amended to Serangoon Integrated Transport Hub and amended to ply Boundary Rd, replacing the deleted sectors of Service 105.
		26 September	Designated wheelchair-accessible bus service (WAB).
	2012	29 April	Serves new bus stop outside Blk 612 along Pasir Ris Dr 1.
	2014	5 October	Serves additional pair of bus stops before and after Punggol Rd along TPE.
	2016	13 November	Serves new pair of bus stops opposite Blk 293D and outside Blk 286B along Sengkang East Rd.
	2022	30 October	Temporarily amended to ply Pasir Ris St 11 and Pasir Ris St 12 with the partial closure of Pasir Ris Dr 1 to facilitate the construction of Pasir Ris East MRT station on the Cross Island MRT Line.
	2023	26 February	Temporarily amended to ply the bus-only corridor along Loyang Ave and Loyang Way with the partial closure of Loyang Ave to facilitate the construction of Loyang Viaduct and Loyang MRT station on the Cross Island MRT Line, skipping 3 pairs of bus stops along Loyang Ave.
		8 October	Temporarily amended to ply Pasir Ris Ctrl and Pasir Ris Dr 8 with the partial closure of Pasir Ris Dr 1 to facilitate the construction of Pasir Ris MRT station on the Cross Island MRT Line.

Short Trip 109A

Operator	Year	Date	Service changes
(Current)	2014	26 May	Introduced from Serangoon Int to Hougang Ave 4 (Blk 913) during evening peak hours on weekdays. Wheelchair-accessible at launch.

Service 110 (1971 - 1977)

Operator	Year	Date	Service changes
STC	1971	11 April	Introduced between Upp Serangoon Rd 10.5 km Ter and Prince Edward Ter under 1971 Bus Reorganisation.
		9 May	Amended to ply Mountbatten Rd, Kallang Rd, Crawford St, Nth Bridge Rd and Bras Basah Rd, skipping Nicoll Highway.
ABS		6 December	Operations transferred to ABS.
	1974	8 December	Amended to ply the extended Robinson Rd, skipping Market St.
	1975	2 March	Amended to ply Sims Ave and Lor 1 Geylang towards Upp Serangoon Rd 10.5 km Ter with the conversion of Geylang Rd to one-way traffic.
		21 July	Amended to ply St. Andrew's Rd and Stamford Rd, skipping Coleman St and Hill St.
	1976	15 February	Serves new staggered bus stop between Bank of India and Hong Leong Holdings along Robinson Rd.
		14 March	Serves new staggered bus stop outside The Cenotaph along Connaught Dr, skipping the bus stop opposite Singapore Cricket Club.
	1977	16 May	Integrated with Service 70 and discontinued.

Service 110 (since 2017)

Operator	Year	Date	Service changes
(Current)	2017	22 October	Introduced between Compassvale Int and Changi Airport PTB 2 (Loop), operating between 0530 hrs and 2345 hrs daily. Wheelchair-accessible at launch.