Match ends, Dartford 1, Luton Town 2.
Dartford missed the change to climb out of the Conference Premier relegation zone as they conceded two late goals to lose to leaders Luton Town.
Luton's Matt Robinson saw his header hit the post, before Mikel Suarez's header put Dartford ahead.
The game turned when Dartford had Kenny Clark sent off for late challenge on Alex Lawless.
Pelly Ruddock's 20-yard strike drew Luton level and Andre Gray's header from Ronnie Henry's cross won it.
Luton stay 13 points clear at the top of the table and now need just three more wins to secure the title, and a return to the Football League after a five-year absence.
Dartford manager Tony Burman told BBC Radio Kent:
"I'm delighted with the way we've performed. We defended for long periods but I felt we were reasonably dangerous on the break.
"Alan [Julian] hasn't made that many saves but the sending off changed the game.
"It's knocked us. We need to have 11 players against a team like Luton. I'm disappointed with the decision.
"I'm standing close to it. The referee is not standing close to it, he's behind them. There's no way that he can see that that's a sending off."
- 1JulianBooked at 77mins
- 5ClarkBooked at 78mins
- 37SuarezSubstituted forCollierat 71'minutes
- 11HowellsSubstituted forRooneyat 66'minutes
- 12GriffithsBooked at 48mins
- 23RobinsonSubstituted forRuddock Mpanzuat 57'minutes
- 27GrayBooked at 87mins
- 26BensonSubstituted forCullenat 54'minutes
- 43Ruddock Mpanzu
- Richard Martin
- Shots on Target
Second Half ends, Dartford 1, Luton Town 2.
Foul by Tyrone Sterling (Dartford).
Ron Henry (Luton Town) wins a free kick.
Foul by Lee Noble (Dartford).
Mark Cullen (Luton Town) wins a free kick.
Offside, Luton Town. Luke Rooney tries a through ball, but Luke Rooney is caught offside.
Andre Gray (Luton Town) is shown the yellow card for a bad foul.
Goal! Dartford 1, Luton Town 2. Andre Gray (Luton Town) header from the centre of the box to the high centre of the goal. Assisted by Ron Henry with a cross.
Attempt saved. Luke Rooney (Luton Town) right footed shot from outside the box is saved.
Foul by Rory McAuley (Dartford).
Andre Gray (Luton Town) wins a free kick.
Goal! Dartford 1, Luton Town 1. Pelly Ruddock (Luton Town) right footed shot from outside the box to the top left corner.
Foul by Alex Lawless (Luton Town).
Tyrone Sterling (Dartford) wins a free kick.
Corner, Luton Town.
Kenny Clark (Dartford) is shown the red card for a bad foul.
Foul by Kenny Clark (Dartford).
Alex Lawless (Luton Town) wins a free kick.
Hand ball by Steve McNulty (Luton Town).