It also canceled its investor day that had been due to be held on March 5.

Read also: British Airways cancels flights to Italy, Korea, Singapore as coronavirus hits demand

With investors firmly focused on how the company is managing the near-term impact of the coronavirus, United said it was not "practical to expect that it can have a productive conversation focused on its long-term strategy next week."

The event will be rescheduled for September.

Chicago-based United already withdrew its 2020 guidance this week due to uncertainty over the duration and spread of the virus. It warned that near-term demand to China has almost disappeared, with demand for the rest of its trans-Pacific routes down by 75 percent.

As a result, the company is temporarily reducing flights from the US mainland to Tokyo, Osaka, Singapore and Seoul and extending the suspension of US flights to mainland China and Hong Kong through April 30, it said on Friday.

The airline is cutting about two thirds of its flights to Seoul, nearly a third of flights to Japan and 40 percent of flights to Singapore. It is also flying smaller planes on some routes.

Among US airlines, United has the biggest international exposure, drawing about 40 percent of its revenues from overseas flights.

Earlier this week, Delta cut South Korea flights in half, citing the outbreak.

United shares fell 5.2 percent on Friday, amid a widespread global share rout, and are down 21 percent over the last week.

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