Orbitz Travel Discounts

Founded by American, Continental, Delta, Northwest and United, Orbitz has a simple yet ingenious system that allows you to compare ticket prices on 450 airlines -- enter the cities and date and preferred time of travel and it shows a grid listing each airline's best price. It even has many Web-only fares. Simply click on the best price or time to book online (the site charges a $7 service fee per ticket). In addition, Orbitz offers discount hotel rooms, car rentals and cruise packages. It offers a guarantee on airfare prices: If another customer books the same flight at a lower price between the time you buy your tickets and your departure date, Orbitz will automatically send you the difference in cash. See site for details.