The relegation-threatened hosts led 1-0 at the break but Brad Dolaghan equalised four minutes into the second half – his fourth goal in three games – and Kane Wills struck the goal that proved the winner.
It means Worthing are assured of a top-seven finish, and still have a chance of finishing second or third, which would put them straight into a play-off semi-final, rather than having to play an extra game to reach that stage.
Aarran Racine’s team’s final two games are away to St Albans and at home to Weston-super-Mare.
See Mike Gunn’s pictures from the win at Dartford on this page and the ones linked.
1. Dartford v Worthing pictures by Mike Gunn (19).jpg
Action from Worthing's win at Dartford Photo: Mike Gunn
2. Dartford v Worthing pictures by Mike Gunn (22).jpg
Action from Worthing's win at Dartford Photo: Mike Gunn
3. Dartford v Worthing pictures by Mike Gunn (24).jpg
Action from Worthing's win at Dartford Photo: Mike Gunn
4. Dartford v Worthing pictures by Mike Gunn (7).jpg
Action from Worthing's win at Dartford Photo: Mike Gunn