By far the quickest way to get from SP to Penang Sentral is to take the KTM Sungai Petani to Butterworth Komuter train operated by Keretapi Tanah Melayu Berhad (Malaysian Railways)
The KTM Komuter Utara services (northern commuter) operate at regular intervals with the first train departing in the early morning until the last train in the evening.
These services operate at the same times every day of the week (there are now extra trains on the busier days of Thursdays, Fridays, Saturdays and Sundays).
To see the latest KTM Komuter train schedule from SP to Butterworth. see the following link:
The KTM Komuter train journey takes just 34 minutes to reach Butterworth Railway Station and stops at the following stations along the route:
Once you arrive at Butterworth Railway Station, it is just a couple of minutes walk to the main Penang Sentral bus terminal where you can take both local and long-distance buses to most places in Peninsular Malaysia or take the ferry over to Georgetown on Penang Island.
(Tambang / Harga Tiket KTM Sungai Petani ke Butterworth)
The fare for the commuter train from SP to Butterworth (Penang Sentral) is currently 3.60 MYR.
All KTM Komuter tickets are only sold on the day of travel (no advance purchase is necessary or available).
Tickets can be purchased from the ticket counter at Sungai Petani Railway Station.