No injuries were reported when the Denver-based United Flight 627 landed at 1:00 PM. left on runway 22 and then slipped off the left side of the runway, according to FAA.
United Airlines said in a statement that the aircraft "experienced several flat tires on landing" and "was deactivated".
None of the 166 passengers on board was taken to hospital, and persons with minor injuries refused medical care, the airline said . Damage to the aircraft was assessed.
"We are in close contact with the FAA and the airport authorities and are rapidly working to safely remove the disabled aircraft so that operations at the airport can be normalized," the airline said.
Newark airport tweeted later that the flights had been resumed, but with further delays expected.
Delays were expected until the plane was moved, the FAA said via Twitter.
The left main landing gear was stuck in a grassy area, according to authorities. The plane was to be towed away from the airport after the passengers had left via stairs and taken buses to a terminal.
The FAA was on the way to launch an investigation, the agency said in a statement on Twitter.