Taiwan's China Airlines plans to raise frequency on its Taipei Taoyuan-Osaka Kansai route from 17 to 24 times weekly.
It will use Airbus A330-300 aircraft on the additional service, says the carrier.
The airline will also reduce frequencies on the Taipei Taoyuan-Yangon route from seven to five times weekly and on the Taipei Taoyuan-Urumqi route from thrice to twice weekly.
Changes on all three routes will take place from 27 October.
Innovata schedules show that China Airlines competes with carriers such as Cathay Pacific, Eva Air and TransAsia Airways on the Taipei Taoyuan-Osaka Kansai route.