Belfitt made his first team debut at Huddersfield on 23 September 1964 scoring the winning goal. With several Leeds forwards injured Belfitt was given a six-game run in the first team where he scored three times before being dropped by
Don Revie. Appearances were limited until the 1966–67 season when he became a regular in February 1967. An Inter-Cities Fairs Cup semi-final first-leg game against
Kilmarnock saw Belfitt scoring three goals in the opening 30 minutes in a 4–2 victory. Belfitt appeared in the goalless second leg and the two-legged final 0–2 defeat by
Dynamo Zagreb. He saw more football the following season including a substitute appearance in the
1968 Football League Cup Final against Arsenal, and he also played as a substitute in the first leg of the
1968 Inter-Cities Fairs Cup Final as Leeds defeated
Ferencváros on aggregate. The following season (1968–69) Leeds won the league title but Belfitt was restricted to eight appearances (two of which were as substitute) but his three goals secured vital victories against Ipswich Town and Sunderland. Belfitt made even fewer appearances in 1969–70 with only a single league and two cup goals in 11 appearances. During 1970–71 Belfitt played more often with ten starts and 11 appearances as substitute yielding four goals. Injuries to Mick Jones and Allan Clarke saw Belfitt picked regularly but scoring just one goal in 16 appearances. He was dropped when Jones returned but following another injury a week later, Belfitt was not picked and promptly handed in a transfer request being signed by
Bobby Robson at Ipswich Town for £55,000. Belfitt's last game was as a substitute away to
Manchester United on 30 October 1971 (his 26th birthday). During his eight years at Leeds Belfitt scored 17 goals from 75 league appearances with a further 16 cup goals from 53 games. ==Ipswich Town==