This depends on the type of request you make, availability of car categories, pick-up and drop-off times, and the prices in effect when you make the change. Upon modifying a booking, Discover Cars always works with the prices available at the moment when the changes are requested.

The modification to your booking may not be guaranteed, especially if you request it less than 48 hours before your original pick-up time. If a last-minute modification can not be fulfilled and it results in your reservation being canceled, your prepayment will not be refunded—in this case, you will only be refunded the cost of Full Coverage if purchased.