For flights with TUI fly, online check-in's really easy to use. Please remember that online check-in opens 24 hours before your flight takes off.
All you need to do is log in to the TUI fly online check-in portal with your last name and your TUI fly booking reference. If you already have your electronic documents, you can upload them directly, or you can take a high-resolution photo of the document if you have a camera.
Flying with another airline, please visit the airline website as you may need to add your advance passenger information into the airline portal.