Revenue: $245.2 million
Whether you’re booking a summer vacation or your next business trip, you might find yourself on Kayak.com. The website and mobile applications allow travelers to research and compare information from hundreds of other travel websites in one display for free. It also provides multiple filtering and sorting options as well as travel management tools and services, such as flight status updates, pricing alerts and itinerary management. Once users find their desired flight, hotel or other travel products, Kayak sends them to their preferred travel supplier websites to complete their purchases.