|Length||7.7 mi (12.4 km)|
The first section of the M621 to open, known at the time as the 'South West Urban Motorway', extends from the M62 to Junction 3 in central Leeds where it used to terminate at a roundabout which was also the terminus of the M1 motorway. This section opened in stages, from the M62 to Junction 1 in 1971, and from Junction 1 to Junction 3 in 1973.
When the M1 was diverted away from Leeds when the 'M1 – A1 Lofthouse to Bramham' extension opened in 1999 adjustments were made to Junction 3 and the Leeds section of the M1 was re-designated as M621 (Junctions 3–7).
|M621 motorway junctions|
|Eastbound exits||Junction||Westbound exits||Coordinates|
|Start of motorway||M62, J27||Manchester, Bradford, Liverpool M62
Batley, Dewsbury A62
|Leeds (West) A6110||J1||Ring Road A6110, Dewsbury (A653)|
|Wetherby A643 (A58), Harrogate (A61), York (A64)||J2||Armley, Elland Road A643|
|No access||J2a||Beeston, Holbeck|
|City Centre A653||J3||City Centre, Beeston, Holbeck A653|
|Hunslet (A61), The North (M1)||J4||Harrogate A61, Leeds (Centre)|
|No access||J5||Hunslet, Beeston|
|The North (M1, A1), Pontefract, Stourton A639||J7||Stourton A639|
|The South, London, Wakefield M1||M1, J43||Start of motorway|