To book a flight using a Costco discount provided with a Costco membership, visit the Costco Travel Web page at CostcoTravel.com and book a vacation that includes a flight. You can also receive discounted airfare by booking your flight as an add-on option for an additional cost if your vacation package does not include airfare. As of 2015, Costco does not offer members the opportunity to book a stand-alone flight.
Costco Travel offers flights from most major U.S. cities. To take advantage of discounted vacation packages and flights, you must have a Costco membership. To get a valuable discount, Costco has a limited selection of airline carriers it uses for trips. If you do not come across a particular carrier when booking an add-on flight, then Costco does not offer a deal with that carrier. Until you pay for your vacation in full, the availability of flights and airfare prices can change without notice.
Flights are also non-refundable if canceled. Seat assignments are not guaranteed. A vacation package that includes air and land travel also requires a deposit that includes the airfare cost.
Since 2001, Costco has offered discounts for travel on cruises, hotels, car rentals, theme parks and vacation packages. The company also offers additional travel discounts for Executive Members including spa credits and hotel room upgrades.