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Generally, for a better deal at Medan Kuala Namu Intl Airport it’s recommended to book in a timely manner (to save up to 74%). Cheapflights recommends you book around 88 days prior to your pickup date. Booking as early as you can also increases the likelihood that you’ll get the ideal car.
The length of time you can book a rental for is subject to the inventory of the supplier. When renting a vehicle from Medan Kuala Namu Intl Airport it should be possible to rent a car for a whole month if needed.