The main transport route for the commune is Route nationale 20 which has avoided the centre of town by a deviation west since 1956 and crosses Arpajon from north to south.
The commune is also the point of convergence of three important departmental roads: the D116D that leads to Dourdan in the west, the D449 that leads to La Ferté-Alais in the south, and the D152 that leads to Brétigny-sur-Orge in the east and to Limours in the west which is duplicated by the D97 which also goes to Limours.
In addition there are the D192 which is a fast route through the Arpajon-Égly-Breuillet urban area and the D193 which connects to the D19.
The commune is located four kilometres south of the Francilienne, a major regional axis that allows quick access to the A10 autoroute and A6 autoroute.

The Bretigny-Tours railway passes across the commune from west to east with Arpajon C4 RER station in the south of the commune served by two trains per hour.

The town is also served by:
Albatrans bus network:
Route 91.04 to Évry
Daniel Meyer bus network:
Route DM151 to Paris-Porte d'Orléans 19
Route DM153 to Massy-Palaiseau
Route DM19 to Brétigny-sur-Orge 20
Route DM20 to Arpajonnais Country between Égly and Norville 21 .

Ormont bus network:
Route 68.01 to Bruyeres-le-Chatel
Route 68.05 to Boissy-sous-Saint-Yon 22, 23 .

Savac bus network:
Route 39.18 to Limours-en-Hurepoix 24 .

CEAT bus network:
Route 10.20 from Paris to Angerville
Route 10.21 from Paris to Méréville
There are also some shuttle buses providing free transport in the commune with some dedicated to the elderly.

Orly Airport is located 18 kilometres away and accessible by Route nationale 20.
Charles de Gaulle Airport is located 51 km away.
For general aviation the Étampes - Mondésir Aerodrome (ICAO: LFOX) is 27 kilometres away.
The main transport route for the commune is Route nationale 20 which has avoided the centre of town by a deviation west since 1956 and crosses Arpajon from north to south. The commune is also the point of convergence of three important departmental roads: the D116D that leads to Dourdan in the west, the D449 that leads to La Ferté-Alais in the south, and the D152 that leads to Brétigny-sur-Orge in the east and to Limours in the west which is duplicated by the D97 which also goes to Limours. In addition there are the D192 which is a fast route through the Arpajon-Égly-Breuillet urban area and the D193 which connects to the D19. The commune is located four kilometres south of the Francilienne, a major regional axis that allows quick access to the A10 autoroute and A6 autoroute.
The Bretigny-Tours railway passes across the commune from west to east with Arpajon C4 RER station in the south of the commune served by two trains per hour.
The town is also served by:
Albatrans bus network:
Route 91.04 to Évry
Daniel Meyer bus network:
Route DM151 to Paris-Porte d'Orléans 19
Route DM153 to Massy-Palaiseau
Route DM19 to Brétigny-sur-Orge 20
Route DM20 to Arpajonnais Country between Égly and Norville 21 .
Ormont bus network:
Route 68.01 to Bruyeres-le-Chatel
Route 68.05 to Boissy-sous-Saint-Yon 22, 23 .
Savac bus network:
Route 39.18 to Limours-en-Hurepoix 24 .
CEAT bus network:
Route 10.20 from Paris to Angerville
Route 10.21 from Paris to Méréville
There are also some shuttle buses providing free transport in the commune with some dedicated to the elderly.
Orly Airport is located 18 kilometres away and accessible by Route nationale 20. Charles de Gaulle Airport is located 51 km away. For general aviation the Étampes - Mondésir Aerodrome (ICAO: LFOX) is 27 kilometres away.
Arpajon