You can park at KLIA Landside Operations for free but at your own risk. This is where most Grab drivers park for free waiting for their next customers.

If you want a safer spot, you can park at Downtown KLIA. Costs RM 1/hour, max RM 15/day.

You can park at these location and order a Grab ride to the circuit for only RM 20/1 way trip. Alternatively, you can approach anyone at these location if they are ok to send you to Sepang, you can nego the price below RM 20. Majority of people in KLIA Landside and Downtown KLIA are e-hailing drivers.