The Daily Mail first reported the video, which shows a child yelling, climbing on a seat, and running through the aisles. The video indicates that the child was disruptive throughout the eight-hour flight.
"That was a nightmare — eight hours of screaming," a person can be heard saying at the end of the video.
On Twitter, viewers gave a variety of responses to the video. Some sympathised with the child and his mother, arguing that the child may have a condition that would make air travel uncomfortable.
"I have one of these at home. He drives me nuts. Nothing mom can do and I feel for her," user angelgrey81 wrote.
Others criticised them.
"With parenting like this, that kid's destined to be President one day," Nash076 wrote.
Lufthansa did not immediately respond to a request for comment.
Here's what Twitter users had to say about the video.