The U.S. Department of State has updated its China travel advisory to Level 4: Do Not Travel. It advises that no one should travel to China at this time. The Chinese authorities have suspended many transport modes in and around Wuhan and placed travel restrictions throughout the country. If you travel to China, there is no guarantee that you will not be affected by these limitations. Many airlines are suspending flights to China as well.
As of Friday, January 31, Delta Airlines, United Airlines, and American Airlines have announcement suspension of flights to China. Please check with each airline's respective websites for the most up-to-date information.