The A5118 is a short A-road in east Flintshire, first classified after World War II. In more recent years it has been truncated at both ends as a result of bypass construction.
The route originally started on the A5104 a short way to the east of Penymynydd. With the opening of the A550 Penyffordd western bypass, the A5104 was diverted from Chester Road to take over the first 0.6 miles of the original route of the A5118 along Mold Road, so that the latter road now starts at the roundabout junction where the A5104 meets the A550.
The A5118 heads west across open fields and before long it passes under the Bidston to Wrexham railway (the Borderlands Line / Llinell y Gororau). Continuing west, we pass a few buildings and a cement factory (visible from some miles away) but otherwise the route retains its rural character. A right turn serves Buckley and the road continues on into the hamlet of Llong, ending soon afterwards at a T-junction meeting with the A541.
The 0.7 miles of the latter road running north-westward from this junction to the A549 at Pentre (now a suburb of Mold) is another former section of the A5118.