
Chase Sapphire Preferred creditcard may be your best choice if you want to receive a discount on your rental car. This card offers primary rental car insurance, which can save you a great deal of money. Basically, your credit card will waive the rental agency's in-house collision damage waiver (CDW) for you. That will save you money, and it will also let you drive a rental car at a discount.
Chase Sapphire Preferred
Chase Sapphire Preferred car-rental discounts are a great way to save on your next rental vehicle. Additional benefits include free CDW coverage. Additionally, your card earns you 2 Ultimate Rewards points every dollar spent on car rentals. For international rentals, there are no foreign transaction fees. The best part is that the discounts are available for all cardholders.

Amex Platinum
Amex Platinum cardholders may be familiar with the Amex Platinum cardholder benefits such as the preferred car rental discounts. If you spend $6,000 within six months, you'll be eligible for 100,000 Membership Rewards Points. These points are redeemable for up to $1,000 towards eligible airfares, hotel stays, and any other travel expenses. Silvercar rentals may also be discounted up to 30% with no restrictions
Avis Preferred
The Chase Sapphire Reserve creditcard comes with special perks, discounts and other benefits from car rental companies like Avis. Chase Sapphire Reserve cardholders who have the Emerald Club Executive status are able to rent a car at an executive rate for an additional fee. Emerald Club members receive a faster rental and a second driver at no extra charge. Avis Preferred status can be paired with the Chase Sapphire Reserve to get discounts and upgrades.
Hertz Gold
It is easy to receive a Chase Sapphire preferred Hertz car hire discount. To be rewarded, sign up to the Hertz Gold Plus Rewards Program. The best thing? You can upgrade to a higher tier, President's Circle, through points earned in other loyalty programs. In addition to discounting the price of your Hertz rental, you'll also enjoy an upgraded car with guaranteed one-class upgrade.

Silvercar
Silvercar customers who are new to the service can take 20% off their first rental. The code is good until January 1, 2019. There is also a promo code for the Visa Infinite card, VISAINF20. This code can be used with all Visa Infinite cards. Combining both codes together could save you upto 50% on your Silvercar hire.