Seoul, Jan 3 : South Korea's low-cost carriers on Monday announced that they have delayed or reduced their flights on international routes due to the spread of the Omicron Covid-19 variant. Air Seoul Inc., a budget carrier unit of Asiana Airlines Inc., has delayed its planned flights to Guam from January 29 to March 27, reports Yonhap News Agency. Air Seoul has offered one flight a week, respectively, on the routes from Incheon to Qingdao and Yantai in China since the summer of 2020 to meet business travel demands. Jeju Air Co., the country's biggest low-cost carrier, said it will continue to provide two flights a week on the Incheon-Guam route until February 26. It had originally planned to provide four flights a week on the route from January 27. It also plans to operate flights on the Busan-Saipan route until January 12, though the route resumed services on December 29, 2021. T'way Air Co. has provided two flights a week on the Incheon-Saipan route but decided to suspend them until January 28. South Korea has two full-service carriers -- Korean Air Lines Co. and Asiana Airlines Inc. -- and 10 LCCs, including Jin Air Co., Air Busan Co., Eastar Jet Co., Fly Gangwon, Air Premia Co. and Air Incheon Co. Air Incheon is a cargo-focused carrier, and the nine other low-cost ones are passenger carriers. /IANS