On KAYAK you can create one by signing in and going directly to Price Alerts in your account or you can look for the "Track Prices" button on the top left-hand side of flight results. If you're searching hotels, select "Set Price Alert" at the top right of the hotel results list. If you're on our app, you can get to Price Alerts using the app's navigation menu and follow instructions there.
A simple flight search at https://www.kayak.com/flights scans for prices on hundreds of travel sites in seconds. We gather flight deals from across the web and put them in one place. Then on the search results page you can use various filters to compare options for the same flight and easily choose the best flight deal from all of the deals coming straight from the travel sites to your screen, with no extra fee from KAYAK.