Japan Airlines Corp. and All Nippon Airways Co. are expected to lower fares on their international routes in January due to dropping fuel costs, industry sources said Monday.

The airlines are expected to lower fuel surcharges -- levied separately from regular flight fares -- by up to 1,100 yen per one-way flight for the first cut in fuel surcharges since the surcharge system was introduced last year, the sources said.

Fuel surcharges on a one-way ticket from Japan to Thailand or Singapore is expected to be lowered by 1,100 yen to 8,900 yen and those for one-way trips to Europe or Northern America by 600 yen to 13,000 yen, they said.

A cut in fuel surcharges would reduce revenue at the airlines for the current business year because they procured most of their current supply when fuel costs were higher, according to the sources. JAL's revenues are expected to be pushed down by more than 1 billion yen and those of ANA by nearly 500 million yen.