Yes, it is possible to fly into the air with a bunch of helium balloons.
Larry Walters of California flew nearly three miles into the air with 45 weather balloons rigged to his lawn chair on July 2, 1982.
The North Hollywood truck driver outfitted the chair with a BB gun, CB radio, giant bottle of soda, and water-filled milk cartons as ballast.
He had hoped to slowly waft into the sky, but instead shot up to 16,000 feet, where he quickly began to go numb from the cold and thin air.
After 45 minutes, he began shooting at the balloons in order to pop them and bring himself down.
In the process he ended up dropping the gun, but hit enough balloons to start a slow descent.
After about two hours, his balloons tangled in power lines, blacking out a Long Beach neighborhood for 20 minutes but allowing him to dismount from his dangling lawn chair.
For his stunt, he appeared on David Letterman’s show and was fined $1,500 by the FAA.