Expedia is a travel website that allows users to book flights, hotels, rental cars, cruises and other vacation packages online for a discounted price. When you make a travel purchase through Expedia, you pay for your purchase upfront and receive a confirmation number and email detailing every aspect of your travel plans. If you need to contact Expedia’s customer service to make changes to your itinerary or for any other reason, there are several ways to do so.