Tallaght is connected to Dublin city by bus services, and by the Red Line of the Luas light rail system, which opened in September 2004.
Though the first stop (Tallaght Cross) of the Red Line is called 'Tallaght', most of the 'Red 4' zone (with the exception of the terminus at Saggart) lies within the broader Tallaght area.
As of 2013, a single ticket from Red 4 to Central 1 was €2.70.

Tallaght is not well connected to Dublin's other towns and suburbs, as public transport lines predominantly run through the city centre; this has led to high levels of car dependence.
 However the 75 bus route links Tallaght to Rathfarnham, Ballinteer, Dundrum, Stillorgan, and Dún Laoghaire, while the 76 links Tallaght to Clondalkin, Liffey Valley Shopping Centre and Ballyfermot and the 175 connects Tallaght with Citywest, Dundrum and UCD.
It is envisioned that the BusConnects project being rolled out over the coming years will establish Tallaght as a public transport hub for surrounding villages and suburbs.

Routes to the city centre include the 27 (via Jobstown and Tymon Park), 49 (The Square, Aylesbury, Oldbawn, Ballycullen and Firhouse), 54a (Kiltipper, Killinarden Heights, The Square, Tallaght Hospital, Tallaght Village, Balrothery), 56a (The Square, Springfield, Fettercairn and Kingswood), 65 (The Square, Tallaght Hospital, Tallaght Village and Balrothery), 65b (Killinarden Heights, Kiltipper Road, Aylesbury, Old Bawn, Firhouse and Ballycullen) and 77a (Blessington, Killinarden Heights, The Square, Tallaght Hospital, Tallaght Village, Old Bawn, Balrothery and Tymon Park).

A metro rail line, Metro West, was planned to pass through Tallaght but following the global financial crisis the project was shelved.
The proposed line was to link Tallaght with the major satellite towns west of Dublin city, including Clondalkin, Lucan, and Blanchardstown.
It would join up with Metrolink and continue out to Dublin Airport in Fingal, North County Dublin.
The first 4 stops of the proposed Metro West were to be in Tallaght, with the first stop, 'Tallaght East' being situated near Tallaght IT, now the Tallaght Campus of Technological University Dublin.

A Luas extension from Belgard to Citywest and Saggart was added to the original Luas system.
This is a 4.2 km (2.5 mi) extension, funded by a Public Private Partnership with property developers, including Davy Hickey Properties.
Identified as Line A1, this €150 million spur off the Red Line at Belgard runs to Saggart.
Originally intended to be a spur off the proposed Red Line as far as Fortunestown, it was later decided to extend it to Saggart.
Construction started on 9 February 2009, with the line completed by early 2011.
Passenger services on the 4.2 km light rail link started in early 2011.
It serves communities such as Cairnwood, Ambervale, Belgard Green, Fettercairn, Kilmartin, Brookview, Ardmore, Citywest Village and Russell Square.
Tallaght is connected to Dublin city by bus services, and by the Red Line of the Luas light rail system, which opened in September 2004. Though the first stop (Tallaght Cross) of the Red Line is called 'Tallaght', most of the 'Red 4' zone (with the exception of the terminus at Saggart) lies within the broader Tallaght area. As of 2013, a single ticket from Red 4 to Central 1 was €2.70.
Tallaght is not well connected to Dublin's other towns and suburbs, as public transport lines predominantly run through the city centre; this has led to high levels of car dependence.  However the 75 bus route links Tallaght to Rathfarnham, Ballinteer, Dundrum, Stillorgan, and Dún Laoghaire, while the 76 links Tallaght to Clondalkin, Liffey Valley Shopping Centre and Ballyfermot and the 175 connects Tallaght with Citywest, Dundrum and UCD. It is envisioned that the BusConnects project being rolled out over the coming years will establish Tallaght as a public transport hub for surrounding villages and suburbs.
Routes to the city centre include the 27 (via Jobstown and Tymon Park), 49 (The Square, Aylesbury, Oldbawn, Ballycullen and Firhouse), 54a (Kiltipper, Killinarden Heights, The Square, Tallaght Hospital, Tallaght Village, Balrothery), 56a (The Square, Springfield, Fettercairn and Kingswood), 65 (The Square, Tallaght Hospital, Tallaght Village and Balrothery), 65b (Killinarden Heights, Kiltipper Road, Aylesbury, Old Bawn, Firhouse and Ballycullen) and 77a (Blessington, Killinarden Heights, The Square, Tallaght Hospital, Tallaght Village, Old Bawn, Balrothery and Tymon Park).
A metro rail line, Metro West, was planned to pass through Tallaght but following the global financial crisis the project was shelved. The proposed line was to link Tallaght with the major satellite towns west of Dublin city, including Clondalkin, Lucan, and Blanchardstown. It would join up with Metrolink and continue out to Dublin Airport in Fingal, North County Dublin. The first 4 stops of the proposed Metro West were to be in Tallaght, with the first stop, 'Tallaght East' being situated near Tallaght IT, now the Tallaght Campus of Technological University Dublin.
A Luas extension from Belgard to Citywest and Saggart was added to the original Luas system. This is a 4.2 km (2.5 mi) extension, funded by a Public Private Partnership with property developers, including Davy Hickey Properties. Identified as Line A1, this €150 million spur off the Red Line at Belgard runs to Saggart. Originally intended to be a spur off the proposed Red Line as far as Fortunestown, it was later decided to extend it to Saggart. Construction started on 9 February 2009, with the line completed by early 2011. Passenger services on the 4.2 km light rail link started in early 2011. It serves communities such as Cairnwood, Ambervale, Belgard Green, Fettercairn, Kilmartin, Brookview, Ardmore, Citywest Village and Russell Square.
Tallaght