How far does a helium filled balloon travel?

Garrick Saito gave an excellent answer. But that was in 2011. Someone asked me to answer in 2016, so I suppose they want to hear my opinion because I have written many answers about balloons. I have been part of several professional balloon launches, but that does not make me an expert on children's balloons. read more

As a result, a helium-filled balloon slowly expands as it rises. Because balloons are thin and relatively weak, they eventually rupture and slowly fall to the ground. Specially designed balloons, however, can reach much greater heights. read more

Latex balloon (that is, rubber balloons) do not hold helium very well. The helium will diffuse through the skin quite quickly. That’s why such balloons float back down to the floor by morning when left floating up at the ceiling at night. read more

Helium is as such lighter than air which is a mixture of different gases including O2 and N2. Now the helium filled balloons travel upward till till the surrounding air become scarce enough and then the balloon bursts open because of the pressure difference. read more