Traveling the world doesn’t have to be expensive — thanks to booking sites like Momondo, people from all walks of life and budgets can find cheap flights, accommodations, transportation, and other activities while traveling. If you’re wondering how to use Momondo, we’ve got a guide below!The convenience of using an online travel agency to book various parts of a trip is why so many people are able to travel all over the world. Online travel agencies make it easy to find desirable locations and book flights, rental cars, hotels, excursions, and more.