Flight of the Lost Balloon is a 1961 film produced, written and directed by Nathan Juran and starring Mala Powers and Marshall Thompson.

A young explorer, Dr. Joseph Faraday (Marshall Thompson), convinces the Royal Geographical Society that the trip should be made by balloon.

After several adventures, including their temporary capture by cannibals and an attack by huge condors, the trio arrive at the Nile fortress where Sir Hubert is held captive.

Prior to landing a tear in the balloon makes the party jettison all their ballast and belongings, with Faraday jumping into the water to lighten the load.

Faraday, who has swum ashore and has eluded the Hindu's native helpers and his captive gorillas, rescues them, but Sir Hubert dies trying to load the balloon with chests of treasure.

Lanphier was taking part under a three picture contract with the Woolners, the other films of which were to be Adventures of Captain Kidd and Thunder Over San Juan.