Japan has been hit by fuel, food and power shortages after the March 11 earthquake and tsunami, which have snarled logistics in the world's third-largest economy.
British Airways, Air France-KLM and Lufthansa have moved crews to Seoul and are using catering services out of Incheon airport, adding a stop in the country for flights through Japan, a Seoul Regional Aviation Administration official said.
The stopover in Seoul adds at least two hours to long-haul flights.
Air France's sister airline, KLM of the Netherlands, has added an intermediate stop on flights out of Tokyo at Kansai airport, near Osaka in Japan, until April 8, a spokeswoman said.
The carriers share a parent firm but operate independently.
Other carriers serving Asia-Pacific, including Australia's Qantas, have added stopovers in Hong Kong, according to industry data.
Qantas said it plans to scale back flights and cut management jobs to help offset soaring fuel prices and an estimated $144 million hit to earnings from a string of natural disasters in key markets. (Reuters)
