The Wells signed off from the 18/19 season with another home defeat.
Conner Coyne gave Deal the lead on 10mins before Sam Wilson doubled for the Hoops 2mins later after farcical defending from The Wells.
The Wells rallied after half time and goals from Josh Biddlecombe 53mins and Jason Thompson 64mins brought the tie level.
Any thoughts of The Wells finishing the season with a win were soon extinguished when Jude Arthurs netted on 75mins.
Sam Wilson adding a fourth for the visitors with 2mins remaining.
The Wells finish the season in 16th with a record of 11 wins, 4 draws and 23 defeats.