Monday to Saturday daytimes eight trains per hour go southeastbound: four towards Glasgow Queen Street of which 2 go to Airdrie and 2 go to Edinburgh Waverley via Bathgate (limited stop) on the North Clyde Line; and four via Glasgow Central, of which 2 go to Larkhall via Hamilton Central and 2 go to Whifflet (every other train extending to Motherwell) on the Argyle Line.
Northwestbound trains head towards Milngavie (4tph) and Dalmuir (4tph, 2 are from the North Clyde line and go to Balloch).

On Monday-Saturday evenings the Milngavie-Edinburgh Waverley service ceases to operate, other routes continue to run.
Sundays there are 2tph between Helensburgh Central and Edinburgh Waverley and 2tph between Milngavie and Motherwell via Hamilton.

Prior to 19 September 2014, Westerton was also served by the overnight Caledonian Sleeper service between Fort William and London Euston running on Sunday-Friday nights (to allow Glasgow-bound passengers to change onto a connecting service, as the sleeper used a route avoiding the city centre).
 From 21 September 2014 the sleeper service was re-routed to call instead at Queen Street Low Level and so the stop was removed from the timetable.
Monday to Saturday daytimes eight trains per hour go southeastbound: four towards Glasgow Queen Street of which 2 go to Airdrie and 2 go to Edinburgh Waverley via Bathgate (limited stop) on the North Clyde Line; and four via Glasgow Central, of which 2 go to Larkhall via Hamilton Central and 2 go to Whifflet (every other train extending to Motherwell) on the Argyle Line. Northwestbound trains head towards Milngavie (4tph) and Dalmuir (4tph, 2 are from the North Clyde line and go to Balloch).
On Monday-Saturday evenings the Milngavie-Edinburgh Waverley service ceases to operate, other routes continue to run. Sundays there are 2tph between Helensburgh Central and Edinburgh Waverley and 2tph between Milngavie and Motherwell via Hamilton.
Prior to 19 September 2014, Westerton was also served by the overnight Caledonian Sleeper service between Fort William and London Euston running on Sunday-Friday nights (to allow Glasgow-bound passengers to change onto a connecting service, as the sleeper used a route avoiding the city centre).  From 21 September 2014 the sleeper service was re-routed to call instead at Queen Street Low Level and so the stop was removed from the timetable.
Westerton railway station