In November 1952 Jones signed for Leeds rugby league club for a record £6,000. A broken arm prevented him having much impact in his first season but in the 1953–54 season he scored 302 points and he first represented Wales in 1953 against France. Jones toured Australasia in 1954. In 1956–57 he scored a record 496 points. He also set the record for most points in a test series in 1956–57. He played in the 1957 World Cup. In the 1960–61 season he played a great part in Leeds' first Championship. Lewis Jones played, was the captain, and scored a try, and 5 conversions in Leeds' 25–10 victory over Warrington in the Championship Final during the 1960–61 season at Odsal Stadium, Bradford on Saturday 20 May 1961, in front of a crowd of 52,177. Lewis Jones played, and scored 3-conversions in Leeds' 9–19 defeat by Wakefield Trinity in the 1961Yorkshire County Cup Final during the 1961–62 season at Odsal Stadium, Bradford on Saturday 11 November 1961. After the 1953 game against France, Wales did not play another officially recognised international match until 1968; but during this period a representative Wales team played in two games against France. The second of these games saw Jones given the captaincy, leading the Wales team out at Toulouse on 17 February 1963. Despite playing twice for Wales, he was only capped for the first match. Lewis also represented Great Britain while at Leeds between 1952 and 1956 against France. Lewis Jones represented the Rest of the World in the 11–20 defeat by Australia at Sydney Cricket Ground on 29 June 1957. Jones' Testimonial match at Leeds took place in 1963. He was the first Leeds player to score over 1,000 goals for the club, a feat not matched until 2009 Kevin Sinfield. Jones became one of fewer than ten Welshmen to have scored more than 2,000 points in their rugby league career. Jones won 15 caps for Great Britain at rugby league, scoring in every game he played. He spent six years as a player-coach in Australia. A schoolteacher by profession, he later taught mathematics in Leeds. As of 2015, he is 9th in British rugby league's "most points in a career" record list behind; Neil Fox, Jim Sullivan, Kevin Sinfield, Gus Risman, John Woods, Mick Nanyn, Cyril Kellett and Kel Coslett.
Post playing
honoured thirteen rugby league footballers on Thursday 20 August 2009, at a ceremony at Wheldon Road, the home of Castleford. A fleet of new buses were named after the 'Arriva Yorkshire Rugby League Dream Team', which included Jones. Members of the public nominated the best ever rugby league footballers to have played in West Yorkshire, supported by local rugby league journalists; James Deighton from BBC Leeds, and Tim Butcher, editor of Rugby League World. In 2013 Jones, along with three other former players, was inducted into the Rugby League Hall of Fame.