The best way to get from Changi Airport T4 to Changi Airport T1 without a car is to bus via Airport Police Stn which takes 30 min and costs $1 - $3.
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You can travel between Terminals 1, 2, and 3 via the complimentary Skytrain service in the transit area. If you're in the public area, you can go to and from Terminals 1 and 3 via the Skytrain. Take note that the Skytrain operates from 4:30am until 1:30am.
At least two hours is recommended. Just remain in the transit area. You won't need to clear arrival immigration and check in again for your connecting flight, so you won't need a visa to enter Singapore.
Before the opening of Terminal 3, the Skytrain system was upgraded from the original Adtranz C-100 system to the new Mitsubishi Crystal Mover system, which expanded the service from a simple 2-station line to a 7-station network. All Changi Airport Skytrain services are free of charge.
Check in your bag before your first flight. The airline will take care of the rest. In most cases, you won't have to collect and recheck your bag between flights.
Departure from Changi AirportFor Singapore Airlines flights to other destinations, check-in will remain at Terminal 3. For updates on departure gate and boarding time for your flight, do check the flight information display screens at the Airport.
Take the free shuttle bus from Terminal 4 Arrival Lounge to Jewel/ Terminal 1 (opposite Jewel Level 2 Drop-off point). Direct shuttle bus service (T4 - Jewel) is available from 6am to 12am daily, while loop bus service (T4 - T3 - T1 - T4) is available from 1am to 6am daily.
Singapore Changi Airport has many comfortable spots to pick from when it comes to sleeping in this airport. In the transit area, you can find transit hotels, snooze lounges, and hundreds of comfortable and modern chairs. You can also access a lounge that includes a pool, a gym, and a buffet.
HSBC Rain Vortex Jewel's centrepiece attraction is the 40m HSBC Rain Vortex – the world's tallest indoor waterfall. Enjoy the light-and-sound show every hour from 7.30pm to 12.30am. To get to Jewel, take the complimentary airport shuttle to Terminal 2 and walk over to Jewel via the link bridge. From Singapore.