Bawtry To Louth
The road starts again slightly further south off the A638 and A614, and heads east of Bawtry passing under the East Coast Main Line railway as Gainsborough Road. It then crosses the River Idle at Bawtry Bridge and enters Nottinghamshire and Bassetlaw. The road bends to the right and becomes dual carriageway as it bypasses the village of Scaftworth, which has two exits to the right. It bends to the left and continues as the single carriageway Bawtry Road (passing SPECS average speed cameras) through Everton, with Harwell on the left. There is a right turn for Mattersey at the Sun Inn. Further on the B6045 joins from Blyth at Drakeholes, where the road has been diverted to the north, over the Chesterfield Canal and Cuckoo Way.
As Gainsborough Road it passes along the top of an escarpment (Cuckoo Hill to the south) near Prospect Hill Farm, and there is a right turn for Wiseton. It passes Park House Farm and climbs Mill Hill then becomes dual carriageway at Gringley on the Hill, which it bypasses to the south on the edge of the escarpment. On the bypass, Clayworth Road exits to the right and Beacon Hill Road (and the Trent Valley Way) to the left, both part of the B1403 (from Misterton). It climbs Beacon Hill, resuming the former route. To the south West Burton power stations and Cottam power stations power stations can be seen. It gently descends the hill and at Beckingham meets the A161 (from the north) at a roundabout near Mill Farm. Previously it met the A161 in the village.
The road becomes dual carriageway again as the road bypasses Beckingham then reaches another roundabout with the A620, from the south (and for Retford). The road continues as dual carriageway, crossing the Doncaster to Lincoln Line, with the former road being Ramper Road to the south, and becomes the single carriageway The Flood Road, on the former route, being the Beckingham-Saundby parish boundary. Approaching Gainsborough it passes the Crown Carveries Trent Port Inn. Crossing Trent Bridge, Gainsborough it enters West Lindsey and Lincolnshire. It then goes through Gainsborough, meeting two spurs of Lea Road (A156) and Trinity Street (A159) at a roundabout. There is an exit for Thorndike Way, the A631 southern relief road of Gainsborough, built in the early 1970s. It was intended to continue the dual carriageway all the way to the A15. On the bypass it passes the Trent Valley Academy to the south, and there is a right turn at traffic lights for Heapham Road. Corringham Road (B1433), the former route, is to the left.
At Woodhouse Farm it resumes its former route. As Corringham Road it enters Corringham, passing the Beckett Arms. There is a left turn for Hemswell Lane, and it continues as Harpswell Lane, becoming the parish boundary for two miles between Hemswell and Harpswell. It climbs the Lincoln Cliff to meet Middle Street (B1398) at a roundabout at Harpswell. It becomes the parish boundary between Hemswell Cliff and Harpswell, with the former RAF Hemswell adjacent on the left, and the Hemswell Court conference centre on the right. There is a right turn for Dog Kennel Road (for Glentworth). The road becomes the parish boundary of Hemswell Cliff and Glentworth. At Caenby Corner it meets the A15 at a roundabout near the TOTAL Caenby Corner Garage, and passes through the parish of Glentham. Near Highfield Farm it becomes the parish boundary of Glentham and Caenby, then passes through Glentham and the Crown Inn, and in the distance are the Lincolnshire Wolds. At Bishopbridge it crosses the River Ancholme, which is its must southern navigable point. It passes The Bell and becomes the parish boundary between Osgodby (to the north) and West Rasen (to the south).
At Kingerby Wood, the A1103 continues for four miles to the left as a trunk road to the A46, and the A631 leaves to the right as a non-trunk road. Most traffic will follow the A1103 for Grimsby. The road becomes more twisty and meets a roundabout at West Rasen, where it crosses the River Rase. As Gainsborough Road it meets the trunk road A46, from the right, at Middle Rasen where the A46 does not have priority. It follows the A46 for a half-mile, and the A46 continues to the left, with the A631 leaving at a right turn. It enters Market Rasen as Gainsborough Road then becomes King Street. It meets the B1202 (former A46) from the left, and as Queen Street passes under the Newark to Grimsby Line then is crosses by the B1203 at traffic lights. As Willingham Road it passes the De Aston School and Market Rasen Racecourse on the right. In Tealby parish it passes through Willingham Woods.
It passes through North Willingham, with a right turn for Sixhills. It then ascends the western edge of the Lincolnshire Wolds as Willingham Road to 142 metres height, crossing Caistor High Street (B1225) at Boucherette Farm, where it enters East Lindsey. It passes through Ludford where it is briefly followed by the Viking Way, passing the Black Horse on the right and the White Hart. At a crossroads the Viking Way leaves to the right. It passes through the parish of Calcethorpe with Kelstern, with a left turn for Kelstern. It passes Cotes Grange Farm with a crossroads for Welton le Wold, to the right. It passes through South Elkington, where in the parish of Elikington it terminates at the A157 just outside of Louth (53°21′55″N 0°02′02″W / 53.3652°N 0.0339°W / 53.3652; -0.0339 (A631 road (eastern end))).
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