Here's how you can use your Costco membership to rent a car (COST)

Costco members can rent cars at discounted prices through Costco Travel.
The retailer's car rental program allows members to reserve cars from participating Alamo, Avis, Budget, and Enterprise locations.
Members need to be 25 or older to use the program.

A Costco membership comes with a number of benefits beyond access to the retailer's warehouses. Members can also get discounts on cars, auto parts, gasoline, and travel services, including car rentals.

Through Costco Travel, members who are 25 and older can get discounted rates on car rentals. The system is similar to the Costco Auto Program — Costco doesn't rent the cars itself, rather, it partners with a third-party supplier and uses its large membership base as leverage to negotiate discounted prices. The retailer's car rental program allows members to reserve cars from participating Alamo, Avis, Budget, and Enterprise locations.

Members can reserve a rental through the Costco Travel website or by calling 1-866-921-7925.

Here's how Costco's car rental program works:

1. Choose when and where you want to pick up and drop off the car

The Costco Travel website allows members to make hotel reservations, purchase a vacation package, book a cruise, or rent a car. Once you've selected the "Rental Cars" tab, you're prompted to enter your zip code and when you're planning to pick up and drop off your car. While the default option is to pick up and drop off at the same location, you can also choose a different drop-off location.

Before members can look at available locations, they must confirm they are at least 25 years old. While some rental services allow reservations from customers who are under 25, any members booking through Costco must be 25 or older.

2. Select the locations you want compare

Once you've specified your zip code, pick up time, and drop off time, the website shows you participating locations in your zip code. You can also zoom out on the map to look at options outside your zip code.

The map displays a small icon next to each location indicating which car rental company runs the location. You can use a filter if you only want to view options near an airport or from a single company.

After you've decided whether or not you want to use a filter, you can select up to four potential locations to compare against each other, using either the map or the numbered list beneath it.

3. Compare your options

After you've selected the locations you'd like to compare, the website creates a grid that lists the class of vehicle (sedan, SUV, etc.) each location offers and the price you'd pay for a car from each class.

The website highlights the lowest available price for each class among the locations you've chosen, and clicking on the price for a given class and location allows you to see the brand and model that location offers. But while the website will indicate that you may receive, say, a Ford Edge if you're looking for a standard SUV, it also notes that you may receive a similar car instead.

This page also shows you the perks each location offers for each class, such as unlimited mileage and the ability to register an additional driver for free.

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