"We will continue to monitor the situation as it develops and will adjust our schedule as needed," United said in a statement.
The coronavirus that originated in Wuhan, China has killed 106 people in the Asian country and spread across the world, rattling financial markets.
United's suspension affects a total of 24 flights.
The other two U.S. airlines that fly to China, Delta Air Lines Inc and American Airlines Group Inc , said they had not reduced their flights at this time but were closely monitoring the situation.
By Tracy Rucinski