Asia's biggest carrier first announced plans to join the global network in October, seeking to bolster its services and operations after a series of safety mishaps hurt its image.
The plans were formalised at a oneworld board meeting in Paris ahead of a meeting of global airlines lobby IATA from Monday.
JAL aims to attract more travellers by taking advantage of a bigger route network and interline electronic ticketing.
In the past it has had alliances with individual airlines including oneworld leaders American Airlines and British Airways, but remained out of global groups.
Its domestic rival All Nippon Airways is a member of the Star Alliance, one of the three major global air associations alongside oneworld.
Eighty percent of passengers travel with the three global alliances, also including SkyTeam.
Together with Hungary's Malev and Royal Jordanian, planned recruits will increase oneworld's passenger capacity by a fifth, taking its share of global air transport to almost 20 percent, the group said in a statement.
Oneworld said revenues arising from alliance fares and sales activities had risen 20 percent to some $650 million in 2005Members of the oneWorld Alliance include, British Airways, American Airlines, Cathay Pacific, Finnair, Iberia, Lan Chile, and Qantas. Air Lingus recently said it would leave the alliance because its move to a low cost structure does not fit into the alliance.
JAL's bottom line, like its peers worldwide, has been hit by high fuel prices. It has also suffered from safety problems, including engine trouble and a takeoff without permission, that prompted some domestic passengers to use ANA instead.
Besides the main airline, five other members of the JAL group will join oneworld as affiliates, the alliance said.
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