Flight 1175 was travelling to Honolulu from San Francisco.
Hobart said the pilots safely landed the aircraft at Daniel K. Inouye International Airport, taxied to the gate, and the passengers got off the plane as they normally would.
Damaged engine of Flight 1175's Boeing 777 aircraft. It was delivered new to United in January 1996.
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After landing at 12.37pm HST (10.37pm GMT), Mr Haddad took to Twitter to post images of the damaged engine and shocking footage of it shaking during the trip.
A local TV station quoted a passenger as saying that after a loud bang, the plane started shaking.
Flight UA1175 ultimately landed safely, with one passenger calling it the "scariest flight of my life".
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Passenger Maria Falaschi posted photos on social media of the engine without its cover while it was in the air and on the runway after the emergency landing. He added,"There was a loud boom and then it was like rattling and the plane was kind of shaking like boom, boom, boom".
Sudiacal was traveling with her 4-month-old-son on the flight.
Hawaii's Department of Transportation said that Aircraft Rescue & Fire Fighting personnel was "standing by as a precaution" as the plane landed. "It was scary. But they did a really good job".
A Google engineer on board the flight, Erik Haddad, who had a clear view of the exposed engine, apparently remained calm throughout the incident, uploading a series of photos to Twitter and quipping: "I don't see anything about this in the manual".
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The airline also said it is cooperating with NTSB and FAA investigations of the incident.