Credit to reddit user dhr2330 for finding this video.

A passenger aboard a commercial airliner captured this footage while traveling from Bogotá to Salento in Colombia, the video is very clear and crisp, what looks like your classic flying saucer is flying through the sky, I can’t determine the distance of the craft, or its size, but it is very clearly seen in the video, also I don’t know what is being said by those observing the strange object.

Edit:

A balloon is the most plausible answer unless further evidence warrants a different answer. Here is a video of common balloons in Colombia and how they might look from a commercial airliner.