Flight UA1909 took off from Los Angeles around 7.15pm local time but made an unexpected landing just three hours later after a passenger allegedly announced a bomb threat, according to ABC7 News.
The plane, which was near Oregon at the time according to FlightRadar24, turned around and landed at San Fransisco International Airport (SFO).
Pilots were able to make the U-turn to SFO after it was determined that the security threat was low, an SFO duty manager told ABC7 News.
The airline reported there were approximately 148 passengers and eight crew members on the flight.
The flight has been rescheduled for 7am local time today.
The Independent has reached out to United Airlines for comment.
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