A joint security team of Nepal army and police found all the 18 people, including three crew members, dead at the site of a plane crash in western Nepal on Monday morning, said a civil aviation official.
The bodies had been burnt severely and only seven of them could be identified. They were brought to the capital for post-mortem.
The Twin Otter plane was flying to Jumla in west Nepal from Kathmandu via Pokhara on Sunday.
After refuelling at the Pokhara airport, the plane took off for Jumla at around 12.40 p.m.
About 30 minutes after the take-off, the pilot of the plane contacted Bhairahawa airport tower for diversion, citing inclement weather. Soon after, it went missing.
Due to heavy snow and rainfall, the search and rescue operation on Sunday could not locate the plane.
The wreckage was found at south west of Pokhara. Although the exact cause of the crash is not known yet, civil aviation officials have blamed inclement weather. The western parts of Nepal have witnessed heavy snowfall and rain for the past five days.
Meanwhile, the government formed a four-member probe panel to investigate the cause of the crash.