Yes, Kayak is highly trustworthy, but it is important to understand that it is a metasearch engine, not a booking agency. Kayak searches hundreds of other travel sites (airlines, hotels, and online travel agencies like Expedia) and displays the results in one place. When you click "Book," Kayak usually redirects you to the third-party site or the airline's own website to finish the transaction. In 2026, it remains a favorite for its "Hacker Fares"—which combine one-way tickets from different airlines to save money—and its "Price Forecast" tool. While Kayak itself is reliable, you should always check the reputation of the specific travel agency it redirects you to. For the best security, many savvy travelers use Kayak to find the deal and then attempt to book directly with the airline to ensure easier customer service if plans change.