TOKYO (AP) -- A United Airlines flight from Chicago with 174 people aboard landed safely at an airport in western Japan on Wednesday after developing radio trouble, officials said.

The Boeing 777 had a radio failure while trying to make a landing approach to Kansai International Airport, said Hiroshi Yasuragi of Transport Ministry's Kansai Office.

The pilot of Flight 877 requested an emergency landing at the airport, which was the plane's destination, and landed safely Wednesday, Yasuragi said.

No one aboard was injured, he said.

The trouble occurred when the flight was at an altitude of about 9,900 feet about 30 miles southwest of the airport, Yasuragi said. The pilot could hear instructions from airport controllers but was unable to respond, he said.

The cause of the problem was under investigation.

Kansai International Airport is near Osaka, about 260 miles southwest of Tokyo.