Dover booked their place in the Isthmian Premier play-offs after coming from behind to win at Chichester on Saturday.
Jake Leberl’s side will now head to runners-up Billericay on Wednesday in the play-off semi-final and they’ll visit either Dartford or Cray Valley in the final if they progress.
Keeper Mitch Walker made his first appearance since November for Whites but was beaten by Lewis Rustell on 25 minutes.
However, George Nikaj headed in a near-post corner on 39 minutes to ensure the teams went in level. That would have been enough for Dover to claim fifth spot but Ruben Soares-Junior put them ahead 20 minutes from time.
The points were sealed in stoppage time when Luke Baptiste scored his 20th league goal of the season from the penalty spot – the third Dover player to reach that figure this season.
Dartford will face Cray Valley at Princes Park in the other semi-final.
Dartford lost 4-1 at home to an excellent Carshalton side in their final game of the campaign – read our match report from Princes Park here.
Cray were also defeated, losing 2-1 at home to Folkestone Invicta.
Cray boss Steve McKimm made five changes from the side that won at Chatham on Easter Monday and saw his side trail 2-0 after goals from Daniel Smith and Matthias Fanimo.
Substitute Andre Coker pulled one back for the Millers in stoppage time. Folkestone finished the season in 12th place.
Chatham finished ninth despite being held to a 2-2 draw at Dulwich on the final day.
Chats twice led through Freddie Sears and John Ufuah but Dulwich equalised in stoppage time through Mark Marshall to deny them maximum points.
Cray Wanderers finished 10th despite going down 4-3 at Lewes.
Soul Kader put the Wands ahead but they were 3-1 down by the time Victor Damyanov scored in the second half with Joshua Williams’ late strike proving nothing more than consolation.
All the issues were decided in Isthmian South East ahead of the final day.
Champions Ramsgate signed off with a 3-3 draw at second-placed Sittingbourne.
Mitchell May scored twice in three minutes for the hosts but Kai Garrett grabbed a brace inside five minutes to level the scores at 2-2 before the half-hour.
Ryan Kingsford put the Brickies ahead early in the second half but Joe Elull swiftly equalised for the visitors.
Margate warmed up for their play-off semi-final at Burgess Hill on Tuesday night with a 1-0 home win over Ashford thanks to Ibrahim Olutade’s second-half winner.
Deal Town finished seventh, taking their goal tally to 92 for the campaign with an impressive 5-0 success at home to Broadbridge Heath.
Tom Chapman scored twice with Ben Chapman, Ife Oni and Owen Wilkinson completing the tally, four of their goals coming in the last 16 minutes.
Sevenoaks finished ninth, one place above Sheppey who they beat on the final day 2-0 with goals from James Bessey-Saldanha and James Jeffrey in the space of seven first-half minutes.
Erith Town were 5-0 up at half-time at home to Lancing before running out 6-1 winners.
James Miles (2), James Dyer, Harry Taylor and Elliott Duncan all netted with substitute Gael Kileba adding a sixth late on.
There were heavy defeats for Herne Bay – 4-0 at Steyning Town – and relegated Hythe Town, who lost 5-1 at home to Beckenham. Louie Theophanous scored twice for Becks with Joe Chalker, Alfie Bloomfield and Freddie Nyhus also netting.
Phoenix Sports drew 1-1 at Three Bridges, Jamarie Brissett’s opener for the visitors was cancelled out by Sam Bull.
