Chandrasena said SriLankan's service levels were high but the formal acceptance into the alliance would give automatic recognition of it to global travellers.
SriLankan is joining the alliance from May 01, after upgrading its passenger support system and some processes to comply with oneworld requirements.
SriLankan chief executive Kapila Chandrasena said oneworld which was made up of airlines in East Asia, Middle East, Europe and North and South America had a gap in South Asia.
SriLankan had an extensive network in the region including to India, he said.
Chandrasena said SriLankan expected incremental revenues of 25 million US dollars a year from joining the alliance.
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SriLankan would also be able to offer 'seamless' travel to South and North America, he said.
SriLankan's frequent flyer program will be integra