Yes, and in 2026, this is actually one of the most recommended ways to spend a long layover or pre-flight window at Singapore Changi Airport. Because Jewel is located in the public (landside) area, you must clear immigration if you are arriving from a flight, or stay "outside" after checking in before passing through departure security. A supportive peer "pro tip": use the Jewel Early Check-In Facility on Level 1. Many airlines, including Singapore Airlines, Emirates, and Qantas, allow you to drop your bags and get your boarding pass up to 24 hours in advance (though 3–12 hours is more common for other carriers). Once your bags are checked, you are free to explore the Rain Vortex and Shiseido Forest Valley without luggage. Just be sure to leave at least 60–90 minutes to clear immigration and reach your gate, as some terminals require a SkyTrain or shuttle bus ride from the Jewel-connected central hub.