From Woodlands Checkpoint
Head south on Woodlands Checkpoint Viaduct/Woodlands Crossing. Continue onto BKE (Bukit Timah Expressway).
Take Exit 1 to merge onto PIE (Pan Island Expressway) towards Changi Airport.
Take Exit 19 to merge onto Whitley Road towards Stevens Road.
Turn right onto Bukit Timah Road. Take the ramp to Clementi Road/Woodlands Road/Johor.
Merge onto Bukit Timah Road. Turn left onto Evans Road. Continue onto Cluny Road.
Turn left onto Napier Road. Slight left onto Tanglin Road. The St. Regis Singapore will be on the right.