Helium Balloon Float Time
How long will they float? It is the question that decides when to inflate. Float time depends on the balloon type, its size and whether latex has been treated, so here is what to expect and how to make them last.
Typical float times
- 11in latex, untreated: around 12 to 20 hours.
- 11in latex, treated with a sealant: 2 to 3 days or more.
- 18in foil: 3 to 5 days.
- Giant foil numbers and shapes: up to a week or longer.
Make them last longer
Inflate as close to the event as you can, keep balloons out of direct sun and heat, and ask about a balloon sealant for latex, which slows the helium escaping. Cold rooms make balloons sink a little; they lift again as they warm up.
Frequently asked questions
Why did my helium balloon not float?
Usually the balloon is too small or was under-filled. Latex under 9in and lightly filled foils will not lift. Fill foils until firm, not soft.
Should I inflate the night before?
Foils are fine overnight. For latex, inflate on the day unless they are treated with a sealant.
Get floating with a helium cylinder, or shop long-lasting foil number balloons.