A number of airlines are diverting flights away from Japan, amid fears of radiation and aftershocks.
Lufthansa has stopped flying direct to Tokyo, along with Air France.
The two European carriers are instead operating flights via Seoul.
It is thought the decision has been taken so that cabin crew don't need to stay for any length of time in the Japanese city.
Air China has cancelled flights today and tomorrow to Tokyo's Narita and Haneda airports.
Eva Air has also cancelled its flights tomorrow, between Tokyo and Taipei.
Fears of a nuclear explosion are growing in Japan, after a nuclear power plant was damaged during Friday's tsunami.