Singapore Changi Airport will consolidate services by suspending Terminal 4 operations from May 16.
The airlines based at Terminal 4 will be moved to Terminals 1 and 3, and stores and restaurants will be closed and the shuttle bus service connecting to Terminal 3 will be suspended.
Operations at Terminal 2 have already been suspended due to the sharp decline in flights caused by COVID-19.
Skytrain services at the airport have been reduced, but visitors and staff can continue to use the MRT link bridge between Terminal 3 and 2 and the link bridges leading to Jewel Changi Airport.
Taxi stands at Terminals 1 and 3 will be consolidated, and airside, several finger piers will not be used for flights until demand returns.
Food and beverage outlets at Changi remain open for takeaways and essential services such as pharmacies continue to serve staff and the public.
Changi Airport Group says it is working with airline and airport partners to restart operations when a sufficient number of flights return to the terminal.