In 2026, you can begin the check-in process for a Royal Caribbean cruise as early as 45 days prior to your sailing date. This is done primarily via the Royal Caribbean mobile app, which is the most efficient method for selecting your "Arrival Time" at the terminal. Getting an early check-in slot is vital because the earliest boarding times (often starting around 10:30 AM or 11:00 AM) fill up fast; once they are gone, you may be assigned a late-afternoon slot, cutting into your first day of vacation. The digital check-in window remains open until 8:00 AM on the morning of your departure. You must complete the process—including uploading your security photo and travel documents—to receive your digital "SetSail Pass." If you miss the digital window, you can check in at the terminal, but the line will be significantly longer and more stressful than the "expedited" entry for app users.