Airfares from South Korea to China have spiked amid a growing coronavirus outbreak on the southern half of the Korean peninsula, travel agency websites show.

A one-way ticket from Seoul to Qingdao, the port city in China’s eastern Shandong province that is about a 90-minute flight from the South Korean capital, has gone up at least fourfold for travel this week, compared with the typical fare. A one-way ticket from Seoul to Yanji, a hub for transport and trade between China and North Korea, has increased by the same multiple.

“The airfare surge is partly due to recent flight cancellations. The one-way trip from Seoul to Qingdao usually costs 400 to 500 yuan (US$57-71), but I think a growing number of Chinese workers in South Korea are trying to get back to China as soon as possible,” said a manager at the Chinese online travel agency Ctrip who declined to give her name.

There are more than 300 direct flights between Seoul and Qingdao each week and about 100 between Yanji and Seoul.