Both sides dropped out of League One at Saltergate despite Jamie Ward's inspiring display for Chesterfield.
Ward's one-man show got underway in the 15th-minute when a dreadful error by Bradford goalkeeper Donovan Ricketts allowed him to open the scoring.
Ward grabbed his second when he slotted home from close-range after Derek Niven's shot had struck a post.
Chesterfield's win was sealed when Ward broke clear and his low cross was turned into his own net by Mark Bower.
Chesterfield: Roche, O'Hare (Jackson 68), Picken, Downes, Hazell, Niven, Allott, Hall, Lowry, Allison, Ward (Larkin 85).
Subs Not Used: Rizzo, Kovacs, Shaw.
Booked: Hazell, Picken, Jackson.
Goals: Ward 15, 28, Bower 60 og.
Bradford: Ricketts, Edghill (Penford 81), Wetherall, Bower, Clarke, Parker (Colbeck 61), Schumacher, Johnson, Daley, Paynter (Bentham 86), Weir-Daley.
Subs Not Used: Howarth, Ainge.
Booked: Bower, Daley, Paynter, Weir-Daley.
Ref: C Boyeson (E Yorkshire).