Building a Kayak clone with Bubble involves starting by registering a free account, wireframing and designing the user interface, configuring the database, and creating workflows to stitch everything together. The admin portal can be used to add flights, hotels, and car rentals data, which is then displayed on a homepage that allows users to search for specific types of travel. Using custom states and conditional rules, the app can dynamically show and hide input elements depending on what type of search query the user enters. Once the search results are retrieved from an external API, they can be displayed on a search results page with features such as booking flights or hotels directly through the app, and dynamic recommendations to cross-sell products. With Bubble's no-code platform, users can build this functionality without needing to write any code, making it accessible to developers of all skill levels.