There are 237.16 km (147.36 miles) from Grantham to Koolkhan in southeast direction and 394.29 km (245 miles) by car and ferry, following the M1 route.
Grantham and Koolkhan are 4 hours 56 mins far apart, if you drive non-stop for 4 hours 53 mins and take a ferry for 2 minutes .
This is the fastest route from Grantham, QLD to Koolkhan, NSW.
Please note the time difference between Grantham, QLD and Koolkhan, NSW is 1 hour. The current time in Grantham is 11:09 pm (Mar 10) and the current time in Koolkhan is 12:09 am (Mar 11).
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