Yes, you can. If you’ve already reserved your rental car but haven’t picked it up yet and you want to extend the car hire period, you may be able to cancel and re-book your rental car with new dates. If you’ve already picked up your rental car and want to change the car hire drop-off date, it’s probably possible. You’ll need to contact the rental company you booked with and ask them if you can extend your rental. Keep in mind that some companies might charge an additional change fee on top of your daily rental fee. You will also likely be charged at a higher daily rate than you found when booking the car.