Large clusters of free-flying helium balloons may distract pilots of aircraft, including helicopters operating at low levels. If these objects are ingested by aircraft engines, they can cause engine damage and endanger lives. As such, there are restrictions in place concerning the release of free-flying helium balloons in Singapore.

During the operating hours of military aerodromes, the release of free-flying helium balloons is strictly prohibited.

Outside the operating hours of military aerodromes, the release of free-flying helium balloons is allowed but subject to the following requirements:

In all cases, individually or as a cluster, the balloons must not exceed 2 meters in any linear dimension.