Pony Rent-a-Car is one of the top picks for this location. They can have you in a rental car for about C$ 606 per week on average.
Booking in advance not only ensures a better chance of getting the vehicle of choice, it can save you up to 17% on your car rental. For a below average price, Cheapflights recommends booking your car rental at least 90 days in advance.
The length of time you can book a rental for is subject to the inventory of the supplier. When renting a vehicle from Tainan Airport it should be possible to rent a car for a whole month if needed.
The average cost of a car rental at Tainan Airport for a month is C$ 2,596. Check Cheapflights to compare pricing and options for your rental car.