What are the ways for Jetblue check in early? JetBlue allows customers to check-in for their flights as early as 24 hours before the scheduled departure time. You can check-in online using the JetBlue website or mobile app, or at a JetBlue airport kiosk. If you check-in online or via the mobile app, you can print your boarding pass or have it sent to your mobile device. If you check-in at an airport kiosk, you can print your boarding pass there.