History of Services 21 - 30

Service 21 (1971 - 1981)

Operator	Route	Year	Date	Service changes
ABC	Fidelio St ↔ Delta (Apr 1971)	1971	11 April	Introduced between Fidelio St Ter and Delta Circus Ter under 1971 Bus Reorganisation.
	Fidelio St ↔ Commonwealth Ave (Apr 1971 - 1973)		25 April	Extended to Commonwealth Ave Ter.
		1973	11 March	Amended to ply Zion Rd towards Commonwealth Ave Ter with the partial conversion of Kim Seng Rd to one-way traffic.
	Chai Chee ↔ Commonwealth Ave (1973 - 1981)		1 July	Amended to Chai Chee Ter.
		1975	2 February	Amended to ply Tiong Bahru Rd and the extended Zion Rd towards Commonwealth Ave Ter with the partial conversion of Kim Seng Rd and Outram Rd to one-way traffic.
			2 March	Amended to ply Sims Ave and Lor 1 Geylang towards Chai Chee Ter with the conversion of Geylang Rd to one-way traffic.
		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.
		1981	15 November	Discontinued.

Service 21 (since 1992)

Operator	Route	Year	Date	Service changes
	Pasir Ris ↔ Lor 1 Geylang (1992 - 1993)	1992	29 November	Introduced between Pasir Ris Int and Lor 1 Geylang Ter under TransitLink Network Integration Exercise Phase 10.
	Pasir Ris ↔ St. Michael's (since 1993)	1993	23 May	Integrated with Service 4 and extended to St Michael's Ter under TransitLink Network Integration Exercise Phase 13.
		1994	TBC	Skips the bus stop outside Kallang Stn along Sims Ave.
		1999	TBC	Serves new pair of bus stops outside and opposite The Clearwater Condo along Bedok Reservoir Rd.
		2001	18 February	Serves new staggered bus stop outside Novena Stn along Thomson Rd, skipping the bus stop outside Novena Ch.
(Current)		2002	TBC	Serves new pair of bus stops opposite and between Blks 731 and 734 along Bedok Reservoir Rd.
		2003	21 June	Amended to ply Bendemeer Rd, Jln Besar, Kitchener Rd and Serangoon Rd under North East MRT Line Rationalisation Phase 1.
		2004	27 April	Amended to ply Geylang Rd, Kallang Rd and Sims Ave towards St. Michael's Ter with the temporary conversion of Lor 1 Geylang to one-way traffic.
			6 December	Amended to ply the reinstated Lor 1 Geylang towards St. Michael's Ter, skipping Geylang Rd, Kallang Rd and Sims Ave.
		2006	26 June	Designated wheelchair-accessible bus service (WAB).
		2016	24 April	Amended to ply Jln Tenteram in both directions.
		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.

Short Trip 21A

Operator	Route	Year	Date	Service changes
(Current)	Geylang Rd → Kitchener Rd (since 2014)	2014	25 May	Introduced from Geylang Rd (Bef Lor 18 Geylang) to Kitchener Rd (Bef Tai Hoe Hotel) on Sundays and Public Holidays. Wheelchair-accessible at launch.

Service 22 (1971 - 1984)

Operator	Route	Year	Date	Service changes
ABC	Fidelio St ↔ Labrador (1971 - 1972)	1971	11 April	Introduced between Fidelio St Ter and Alexandra Rd Ter.
	Fidelio St ↔ Tg Berlayer (1972 - 1973)	1972	TBC	Extended to Tg Berlayer Ter.
	Chai Chee ↔ Tg Berlayer (1973 - 1984)	1973	1 July	Amended to Chai Chee Ter.
		1974	3 February	Amended to skip Fidelio St under 1974 Bus Rationalisation.
		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 March	Amended to ply Sims Ave towards Chai Chee Ter with the conversion of Geylang Rd to one-way traffic.
		1979	14 October	Amended to ply Sims Ave East towards Chai Chee Ter with the conversion of Changi Rd to one-way traffic.
		1984	22 April	Discontinued.

Service 22 (since 1988)

Operator	Route	Year	Date	Service changes
	Ang Mo Kio ↔ Tampines (1988 - 2021)	1988	24 January	Introduced between Ang Mo Kio Int and Tampines Int.
		1999	TBC	Serves new pair of bus stops outside and opposite The Clearwater Condo along Bedok Reservoir Rd.
(Current)		2002	24 March	Amended to Ang Mo Kio Temp Int.
				First bus from Ang Mo Kio Temp Int revised to 0530 hrs on weekdays and Saturdays.
			TBC	Serves new pair of bus stops opposite and between Blks 731 and 734 along Bedok Reservoir Rd.
		2003	21 June	Amended to ply Serangoon Ctrl and Upp Serangoon Rd under North East MRT Line Rationalisation Phase 1.
			TBC	Serves new bus stop outside Serangoon Stn along Serangoon Ctrl.
		2007	28 April	Amended to Ang Mo Kio Integrated Transport Hub.
		2011	7 March	Designated wheelchair-accessible bus service (WAB).
		2013	22 September	Serves new bus stop outside Wisma AUPE along Upp Paya Lebar Rd.
		2017	12 February	Serves new pair of bus stops before and after Ubi Rd 3 along Ubi Ave 2.
				Serves additional pair of bus stops outside and opposite Our Tampines Hub along Tampines Ave 5.
	Ang Mo Kio ↔ Eunos (since 2021)	2021	12 December	Shortened to Eunos Int under Downtown MRT Line 3 Rationalisation.

Service 23

Operator	Route	Year	Date	Service changes
	Tampines ↺ Orchard Rd (1983 - 1991)	1983	20 February	Introduced between Tampines Ter and Orchard Rd (Loop).
		1987	29 November	Amended to Tampines Int.
		1988	23 October	Skips a pair of bus stops outside and opposite Tampines Stadium along Tampines Ave 5.
	Tampines ↺ Rochor Canal Rd (since 1991)	1991	6 January	Shortened to loop at Rochor Canal Rd under TransitLink Network Integration Exercise Phase 1.
		1995	18 September	Amended to ply Tampines Ave 1, Tampines Ave 10 and Bedok Nth Rd with the opening of Temasek Polytechnic.
		1997	TBC	Serves additional pair of bus stops outside and opposite Tampines Stadium along Tampines Ave 5.
		2001	TBC	Serves new pair of bus stops outside and opposite Tropica Condo along Tampines Ave 1.
(Current)		2007	TBC	Serves new pair of bus stops outside Kallang Basin Swim Cplx and after Infineon along Jln Kolam Ayer.
		2017	21 August	Designated wheelchair-accessible bus service (WAB).
			21 October	Serves new bus stop outside Bedok Nth Stn along Bedok Nth Rd.
		2022	3 April	Serves additional bus stop outside Jln Besar Stn Exit A along Jln Besar.
			27 November	Serves new pair of bus stops outside and opposite HomeTeamNS Bedok along Bedok Nth Rd.

Short Trip 23A (2006 - 2010)

Operator	Year	Date	Service changes
	2006	28 August	Introduced from Tampines Int to Tampines Ave 1 (Temasek Poly West G) during morning peak hours on weekdays.
	2010	TBC	Discontinued.

Service 24

Operator	Route	Year	Date	Service changes
	Ang Mo Kio ↺ Changi Airport (1983 - 1996)	1983	25 June	Introduced between Ang Mo Kio Int and Changi Airport PTB (Loop) with the merger of SBS Services 392, 394 and SSB Service 727 under Changi Airport Bus Plan 1983.
		1986	6 July	Serves the bus stop outside Blk 416 along Sims Ave, skipping the bus stop outside Blk 414.
		1990	13 October	Amended to serve Changi Airport PTB 2.
	Ang Mo Kio ↔ Changi Airport (1996 - 2012)	1996	TBC	Converted to bi-directional service between Ang Mo Kio Int and Changi Airport PTB 1.
		2000	TBC	Serves new pair of bus stops outside and opposite SATS Flight Kitchen along Airport Blvd.
(Current)		2002	24 March	Amended to Ang Mo Kio Temp Int.
		2003	16 March	Amended to ply Eunos Ave 5 and Eunos Rd 8 with the partial closure of Paya Lebar Rd to facilitate the construction of Paya Lebar MRT station on the Circle MRT Line.
		2007	28 April	Amended to Ang Mo Kio Integrated Transport Hub.
			11 November	Amended to serve Changi Airport PTB 3.
		2009	23 August	Amended to ply the reinstated Paya Lebar Rd, skipping Eunos Ave 5 and Eunos Rd 8.
		2010	2 December	Designated wheelchair-accessible bus service (WAB).
	Ang Mo Kio ↺ Changi Airport (since 2012)	2012	9 January	Converted to loop service between Ang Mo Kio Int and Changi Airport PTB 2.
		2013	22 September	Serves new bus stop outside Wisma AUPE along Upp Paya Lebar Rd.
		2017	22 October	Amended to serve Changi Airport PTB 4.
		2018	8 April	Serves new pair of bus stops after Somapah Rd and before Simei Rd along Upp Changi Rd East.

Short Trip 24A (2002 - 2004)

Operator	Year	Date	Service changes
	2002	24 February	Introduced as a full day short-trip service from Ang Mo Kio Int to New Upp Changi Rd (Tanah Merah Stn), operating as alternate trips of Service 24.
		24 March	Amended to Ang Mo Kio Temp Int.
	2004	TBC	Discontinued.

Service 25

Operator	Route	Year	Date	Service changes
	Ang Mo Kio ↔ Bedok (1979 - 2017)	1979	28 October	Introduced between Ang Mo Kio Ave 3 Ter and Bedok Int.
		1980	1 June	Amended to ply Boundary Rd and Upp Paya Lebar Rd, skipping Lor Chuan, Braddell Rd and Bartley Rd.
		1981	5 July	Amended to Ang Mo Kio Ctrl 2 Ter.
		1983	10 April	Amended to Ang Mo Kio Int.
		1985	7 July	Amended to ply Ang Mo Kio Ave 3, Hougang Ave 2, Hougang Ave 3, Eunos Lk and Jln Eunos, skipping Ang Mo Kio Ave 8, Ang Mo Kio Ave 1, Boundary Rd, Upp Paya Lebar Rd and Paya Lebar Rd.
		1994	TBC	First bus from Ang Mo Kio Int brought forward to 0530 hrs on Sundays and Public Holidays.
(Current)		2002	24 March	Amended to Ang Mo Kio Temp Int.
			TBC	First bus from Bedok Int brought forward to 0515 hrs on weekdays and Saturdays, and 0530 hrs on Sundays and Public Holidays.
		2005	19 February	Serves additional pair of bus stops outside Jubilee and opposite Blk 710 along Ang Mo Kio Ave 8.
		2007	28 April	Amended to Ang Mo Kio Integrated Transport Hub.
		2011	19 November	Amended to Bedok Temp Int.
		2012	26 March	Designated wheelchair-accessible bus service (WAB).
		2014	30 November	Amended to Bedok Integrated Transport Hub.
	Ang Mo Kio ↔ Upp East Coast (since 2017)	2017	9 April	Extended to Upp East Coast Ter, skipping Bedok Int.

Short Trip 25A (2000 - 2003)

Operator	Year	Date	Service changes
	2000	TBC	Introduced from Ang Mo Kio Int to Hougang Ave 3 (Aft Kim Chuan Rd) during morning peak hours on weekdays.
	2002	24 March	Amended to Ang Mo Kio Temp Int.
	2003	TBC	Discontinued.

Service 26

Operator	Route	Year	Date	Service changes
	Bedok ↺ Geylang Bahru (1981 - 1989)	1981	12 July	Introduced between Bedok Int and Geylang Bahru (Loop).
		1986	21 July	Last bus extended to 2330 hrs daily.
	Bedok ↔ Toa Payoh (since 1989)	1989	27 August	Integrated with Service 148 and extended to Toa Payoh Int.
			19 November	Serves new bus stop outside Kallang Stn along Sims Ave.
		1994	5 March	Amended to ply Kim Keat Link and Lor 6 Toa Payoh towards Toa Payoh Int.
			11 July	Amended to ply Jln Kolam Ayer, Bendemeer Rd, Whampoa Nth and Serangoon Rd.
			TBC	Skips the bus stop outside Kallang Stn along Sims Ave.
		1998	31 May	Amended to Toa Payoh Temp Int.
				Serves new pair of bus stops outside and opposite Toa Payoh Swim Cplx along Lor 6 Toa Payoh.
(Current)		2002	19 May	Amended to Toa Payoh Integrated Transport Hub.
		2003	4 May	Amended to ply Geylang Bahru, Bendemeer Rd, Whampoa East and Serangoon Rd, skipping Jln Kolam Ayer and Whampoa Nth.
		2004	27 April	Amended to ply Geylang Rd, Kallang Rd and Sims Ave towards Toa Payoh Int with the temporary conversion of Lor 1 Geylang to one-way traffic.
			6 December	Amended to ply the reinstated Lor 1 Geylang towards Toa Payoh Int, skipping Geylang Rd, Kallang Rd and Sims Ave.
		2005	TBC	Serves an additional bus stop outside City Plaza along Geylang Rd.
		2011	19 November	Amended to Bedok Temp Int.
		2014	23 March	Designated wheelchair-accessible bus service (WAB).
			30 November	Amended to Bedok Integrated Transport Hub.
		2016	12 June	Amended to ply Chai Chee St and Chai Chee Dr, skipping New Upp Changi Rd.

Service 27

Operator	Route	Year	Date	Service changes
	Tampines ↺ Changi Airport (1988 - 1992)	1988	24 January	Introduced between Tampines Int and Changi Airport PTB (Loop).
			23 October	Skips a pair of bus stops outside and opposite Tampines Stadium along Tampines Ave 5.
		1990	13 October	Amended to serve Changi Airport PTB 2.
	Pasir Ris ↺ Changi Airport (1992 - 1995)	1992	29 November	Extended to Pasir Ris Int under TransitLink Network Integration Exercise Phase 10.
		1993	24 January	Amended to serve Tampines Int in both directions.
		1994	16 January	Amended to ply Pasir Ris St 52 and Pasir Ris Dr 1, skipping Pasir Ris Ctrl.
	Tampines ↺ Changi Airport (1995 - 1996)	1995	10 September	Shortened to Tampines Int with the introduction of Service 15.
	Tampines ↔ Changi Airport (1996 - 1999)	1996	TBC	Converted to bi-directional service between Tampines Int and Changi Airport PTB 1.
			TBC	First bus from Tampines Int brought forward to 0545 hrs on Sundays and Public Holidays.
		1997	TBC	Serves additional pair of bus stops outside and opposite Tampines Stadium along Tampines Ave 5.
	Sengkang ↔ Changi Airport (1999 - 2002)	1999	25 July	Extended to Sengkang Ter.
			TBC	Serves reinstated bus stop outside Blk 298A along Punggol Rd.
		2000	TBC	Serves new pair of bus stops outside and opposite SATS Flight Kitchen along Airport Blvd.
			TBC	Serves 2 new pairs of bus stops outside and opposite Tampines Dormitory and before and after Tampines Ind Ave 5 along Tampines Ave 10.
			TBC	Serves reinstated bus stop outside Blk 190C along Punggol Rd.
		2001	28 April	Amended to Sengkang Temp Int.
(Current)		2002	TBC	Serves new pair of bus stops before and after Tampines Ave 9 along Tampines Ave 10.
	Hougang Ctrl ↔ Changi Airport (2002 - 2012)		29 December	Extended to Hougang Ctrl Int.
		2003	TBC	Serves new pair of bus stops before and after TPE along Tampines Ave 10.
		2007	11 November	Amended to serve Changi Airport PTB 3.
		2009	26 October	Designated wheelchair-accessible bus service (WAB).
	Hougang Ctrl ↺ Changi Airport (since 2012)	2012	9 January	Converted to loop service between Hougang Ctrl Int and Changi Airport PTB 2.
		2014	24 August	Serves new pair of bus stops before and after Punggol Rd along TPE.
		2015	8 November	Serves new pair of bus stops outside and opposite CityLife @ Tampines along Tampines Ave 9.
		2017	11 September	Last bus extended to 2350 hrs daily.
		2022	28 August	Temporarily amended to ply Hougang Ave 4 and Hougang Ave 10 with the partial closure of Hougang Ctrl to facilitate the construction of Hougang MRT station on the Cross Island MRT Line.
		2024	27 May	First bus brought forward to 0510 hrs on weekdays.

Short Trip 27A

Operator	Route	Year	Date	Service changes
(Current)	Compassvale Rd → Tampines Ave 5 (2002 - 2009)	2002	30 December	Introduced from Compassvale Rd (Opp Blk 240) to Tampines Ave 5 (Blk 147) during morning peak hours on weekdays.
	Sengkang East Ave → Tampines Ave 4 (since 2009)	2009	17 August	Extended to start from Sengkang East Ave (Blk 203B) and shortened to terminate at Tampines Ave 4 (Opp Century Sq).
			26 October	Designated wheelchair-accessible bus service (WAB).
		2014	24 August	Serves new bus stop after Punggol Rd along TPE.
		2015	8 November	Serves new bus stop opposite CityLife @ Tampines along Tampines Ave 9.

Short Trip 27B (2007 - 2008)

Operator	Year	Date	Service changes
	2007	26 March	Introduced from Tampines Ave 5 (Blk 938) to Compassvale Rd (Blk 240) during evening peak hours on weekdays.
	2008	TBC	Discontinued.

Service 28 (1983 - 1992)

Operator	Route	Year	Date	Service changes
	Tampines ↺ New Bridge Rd (1983 - 1987)	1983	4 September	Introduced between Tampines Ter and New Bridge Rd (Loop).
	Tampines ↔ New Bridge Rd (1987 - 1992)	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 Tampines Ave 5 Ter to facilitate the first stage of road expansion along New Bridge Rd.
			1 November	Amended to ply Eu Tong Sen St towards Tampines Ave 5 Ter to facilitate the second stage of road expansion along New Bridge Rd.
			29 November	Amended to Tampines Int.
			13 December	Serves new staggered bus stop opposite Peninsula Plaza along Nth Bridge Rd, skipping the bus stop outside St Andrew's Cath.
		1988	20 March	Amended to ply Upp Cross St and New Bridge Rd, skipping Neil Rd.
			23 October	Skips a pair of bus stops outside and opposite Tampines Stadium along Tampines Ave 5.
		1990	22 July	Serves additional bus stop outside Ellenborough Mkt along Eu Tong Sen St.
		1992	29 November	Integrated with Service 2 and discontinued under TransitLink Network Integration Exercise Phase 10.

Service 28 (since 1994)

Operator	Route	Year	Date	Service changes
	Tampines ↺ Bedok (1994 - 2000)	1994	2 October	Introduced between Tampines Int and Bedok Int (Loop).
		1999	TBC	Serves new pair of bus stops outside and opposite The Clearwater Condo along Bedok Reservoir Rd.
	Tampines ↔ Toa Payoh (since 2000)	2000	29 October	Integrated with Service 152 and extended to Toa Payoh Int, skipping Bedok Nth St 1 and Bedok Int.
		2001	TBC	Serves new pair of bus stops opposite Blk 761 and opposite Baywater along Bedok Nth Ave 3.
(Current)		2002	19 May	Amended to Toa Payoh Integrated Transport Hub.
		2003	16 March	Amended to ply Eunos Ave 5 and Eunos Rd 8 with the partial closure of Paya Lebar Rd to facilitate the construction of Paya Lebar MRT station on the Circle MRT Line.
			23 March	Amended to ply Tampines St 45, Tampines St 34 and Tampines St 32.
				First bus from Tampines Int brought forward to 0540 hrs daily. First bus from Toa Payoh Int brought forward to 0555 hrs daily.
		2006	TBC	Skips a pair of removed bus stops outside and opposite Bedok Green Sec Sch along Bedok Nth Ave 3.
		2009	8 March	Skips a pair of bus stops outside and opposite Bartley Sec Sch with the realignment of the junction of Upp Paya Lebar Rd and Bartley Rd.
			23 August	Amended to ply the reinstated Paya Lebar Rd, skipping Eunos Ave 5 and Eunos Rd 8.
		2010	13 February	Serves new pair of bus stops outside and opposite Blk 220 CP along Bedok Nth Ave 3.
		2015	28 September	Designated wheelchair-accessible bus service (WAB).

Service 29

Operator	Route	Year	Date	Service changes
	Tampines ↺ Changi AirFreight Ctr (1985 - 1994)	1985	9 June	Introduced between Tampines Ter and Changi Airport Cargo Cplx (Loop).
		1987	26 April	Integrated with Services 210 and 218 and amended to ply Cranwell Rd, Netheravon Rd and Changi Village Rd.
			29 November	Amended to Tampines Int.
		1992	29 November	Amended to loop at Changi Village Ter after 1930 hours daily under TransitLink Network Integration Exercise Phase 10.
	Tampines ↺ Changi Village (since 1994)	1994	23 January	Amended to loop at Changi Village Ter throughout the day.
(Current)		2002	TBC	Serves new pair of bus stops outside and opposite Changi Chapel Museum along Upp Changi Rd Nth.
		2003	23 March	Amended to ply Tampines St 41 and Tampines Ave 9.
				First bus brought forward to 0520 hrs daily. Last bus extended to 2345 hrs daily.
		2010	28 February	Designated wheelchair-accessible bus service (WAB).

Short Trip 29A

Operator	Route	Year	Date	Service changes
(Current)	Tampines → Tampines Ave 7 (since 2013)	2013	4 March	Introduced from Tampines Int to Tampines Ave 7 (Blk 497D) during evening peak hours on weekdays. Wheelchair-accessible at launch.

Service 30

Operator	Route	Year	Date	Service changes
	Chai Chee ↔ Jln Ahmad Ibrahim (1974 - 1978)	1974	3 February	Re-numbered from Service 30/30A as a service between Chai Chee Ter and Jln Ahmad Ibrahim Ter.
			8 December	Amended to ply the extended Robinson Rd, skipping Market St.
		1976	15 February	Serves new staggered bus stop outside Overseas Union Finance along Robinson Rd.
	Chai Chee ↔ Jurong (1978 - 1979)	1978	1 June	Extended to Jurong Int.
		1979	11 February	Amended to ply the extended Shenton Way towards Jurong Int, skipping Parsi Rd and Anson Rd.
	Bedok ↔ Jurong (1979 - 1990)		25 February	Amended to Bedok Int.
			14 October	Amended to ply Still Rd and Sims Ave East towards Bedok Int with the conversion of Changi Rd to one-way traffic, skipping Telok Kurau Rd.
			25 November	Amended to ply Sims Ave/Geylang Rd and Tg Katong Rd, skipping Telok Kurau Rd/Still Rd, Joo Chiat Pl and Joo Chiat Rd.
		1981	11 October	Serves new staggered bus stop outside Tunas Bldg along Anson Rd, skipping the bus stop outside Intl Plaza.
		1982	24 May	Amended to ply West Coast Highway.
		1988	3 January	Serves new staggered bus stop opposite Treasury Bldg along Shenton Way, skipping the bus stop opposite Marina Hse.
	Bedok ↔ Boon Lay (since 1990)	1990	1 July	Extended to Boon Lay Int and amended to ply Teban Gdns Rd towards Boon Lay Int.
		1992	28 June	Amended to ply Mountbatten Rd, Fort Rd and ECP under TransitLink Network Integration Exercise Phase 8, skipping Nicoll Highway and Shenton Way.
		1996	TBC	Skips a pair of removed bus stops outside and opposite MOE Water Works along Jln Ahmad Ibrahim.
		1999	20 September	Serves new pair of bus stops outside and opposite West Bay Resort Condo along West Coast Rd.
			TBC	Skips a pair of removed bus stops outside and opposite Wishart Rd along Telok Blangah Rd.
		2001	TBC	Amended to ply West Coast Rd and Penjuru Rd with the partial closure of Teban Gdns Rd.
(Current)		2002	TBC	Skips removed bus stop opposite ITE Pasir Panjang along Telok Blangah Rd.
			TBC	First bus from Boon Lay Int brought forward to 0530 hrs on weekdays and Saturdays, and 0545 hrs on Sundays and Public Holidays.
		2003	16 March	Amended to ply Geylang Rd, Paya Lebar Rd and Sims Ave with the partial closure of Tg Katong Rd to facilitate the construction of Paya Lebar MRT station on the Circle MRT Line.
			TBC	Serves new bus stop outside Shell Kiosk along Tg Katong Rd.
		2004	TBC	Last bus from Bedok Int extended to 2335 hrs daily.
		2006	19 March	Amended to ply Cassia Lk, Cassia Cres, Guillemard Rd and Guillemard Camp Rd with the partial closure of Old Airport Rd and Dunman Rd to facilitate the construction of Dakota MRT station on the Circle MRT Line.
	Bedok ↔ Boon Lay Temp Int (2006 - 2009)		18 June	Amended to Boon Lay Temp Int.
			29 October	Serves new bus stop outside VivoCity along Telok Blangah Rd.
		2008	7 December	Skips removed bus stop opposite Temenggong D Mque along Telok Blangah Rd.
			29 December	Amended to ply the reinstated Old Airport Rd and Dunman Rd, skipping Cassia Lk, Guillemard Rd and Guillemard Camp Rd.
		2009	4 October	Amended to ply the reinstated Tg Katong Rd, skipping Geylang Rd, Paya Lebar Rd and Sims Ave.
	Bedok ↔ Boon Lay (since 2009)		27 December	Amended to Boon Lay Integrated Transport Hub.
		2011	19 November	Amended to Bedok Temp Int.
			3 December	Designated wheelchair-accessible bus service (WAB).
		2013	29 December	Amended to ply MCE with the partial closure of ECP.
		2014	30 November	Amended to Bedok Integrated Transport Hub.
		2023	8 January	Amended to ply realigned Teban Gdns Rd with the permanent partial closure of Teban Gdns Rd to facilitate the construction of Pandan Reservoir MRT station on the Jurong Region MRT Line, serving an additional bus stop before Teban Gdns Rd along Jurong Town Hall Rd.

Short Trip 30A (2000 - 2007)

Operator	Year	Date	Service changes
	2000	TBC	Introduced from Bedok Int to Fort Rd (Opp Fort Gdns) during morning peak hours on weekdays.
	2003	TBC	Serves new bus stop outside Shell Kiosk along Tg Katong Rd.
	2006	19 March	Amended to ply Cassia Lk, Cassia Cres, Guillemard Rd and Guillemard Camp Rd with the partial closure of Old Airport Rd and Dunman Rd to facilitate the construction of Dakota MRT station on the Circle MRT Line.
	2007	3 January	Discontinued.

Short Trip 30B (2004 - 2010)

Operator	Year	Date	Service changes
	2004	29 March	Introduced from Boon Lay Int to Telok Blangah Rd (Opp HarbourFront Ctr) during morning peak hours on weekdays.
	2006	18 June	Amended to Boon Lay Temp Int.
	2009	27 December	Amended to Boon Lay Integrated Transport Hub.
	2010	TBC	Discontinued.

Service 30/30A (1971 - 1974)

Operator	Route	Year	Date	Service changes
STC	Changi Rd ↔ Prince Edward (Apr - May 1971)	1971	11 April	Introduced between Changi Rd Ter and Prince Edward Ter under 1971 Bus Reorganisation.
	Changi Rd ↔ Intl Rd (May 1971 - 1972)		2 May	Extended to Intl Rd Ter.
ABS			6 December	Operations transferred to ABS.
	Changi Rd ↔ Jln Ahmad Ibrahim (1972 - 1973)	1972	24 December	Amended to Jln Ahmad Ibrahim Ter.
	Chai Chee ↔ Jln Ahmad Ibrahim (1973 - 1974)	1973	1 July	Amended to Chai Chee Ter.
		1974	3 February	Amended to skip Stamford Rd, Waterloo St and Bras Basah Rd and re-numbered Service 30 under 1974 Bus Rationalisation.