The prom is 'rapidly approaching completion' says the Isle of Man government.
As a result, from 07:00 BST on September 30, Finch Road will revert back to its prior one way system.
The Church Road Marina roundel on the promenade will also fully open, alongside the bus stop and parking on Prospect Hill which will be reinstated at this time.
The Department of Infrastructure and Auldyn Construction said they "would like to thank all motorists for their continued vigilance and patience during these changes".