Motorist travelling to Auckland Airport this morning are being advised to find a different route after a crash near Hillsborough has left the motorway clogged.

The New Zealand Transport Authority has tweeted an accident is blocking the right lane southbound on the Southwestern Motorway after the Hillsborough Rd on-ramp.

It said traffic was down to one lane and motorists should consider an alternate route if travelling to the airport as traffic was congested in the area.