Air Niugini's chairman, Sir Kostas Constantinou, last night said one passenger remained unaccounted for.
But Air Niugini chief executive Tahawar Durrani said the man's body was found by divers in the lagoon on Monday.
The airline said everyone safely evacuated the aircraft, but now says one man had died.
Air Niugini said in a statement Monday that the four are in stable condition at a Chuuk island hospital and would soon be taken to Guam for further treatment.
An Air Niugini plane floating in Pacific lagoon near Chuuk Airport in Weno, Federated States of Micronesia, Friday, Sept. 28, 2018.
The nine Filipinos onboard Air Niugini Flight that crashed into a Pacific lagoon in Micronesia on Friday after missing the runway were safe and are on their way to Manila, the Department of Foreign Affairs (DFA) reported Saturday.
The male passenger was last seen in a small boat transporting passengers and crew to shore, an airline statement said, adding that the airline has contacted his family and it is working with local authorities to locate him.
The exact cause of the crash remains unclear.
Lt. Zach Niezgodski /U.S. Navy/Handout via ReutersUS Navy sailors help shuttle passengers and crew from Air Niugini Flight 73 after it crash-landed into a Micronesian lagoon on September 28. Some witnesses thought the plane overshot the runway.
An official from Micronesia's Division of Civil Aviation did not immediately respond to a request for comment on Monday.
Flight PX73 flies from the Tokyo Narita Airport in Japan to the Papua New Guinea capital Port Moresby via Pohnpei and Chuuk.