If you have a single-day rental, but circumstances force you to return the vehicle the next day, you must pay for that extra 24h and probably a late-return fee on top. Besides, your schedule can have an impact on the total cost of renting a car. Suppose you have a business deal extending through the weekend. Find out how the weekday rental rate differs from a weekend rental to avoid surprises. Lastly, if you have been offered a discount for booking four days, returning the vehicle on the third day could make you lose the deal. Search rental cars on KAYAK