Taken from website :

Leave the M1 at Junction 21, or if coming from the Midlands, follow the M69 until the end of the motorway (which meets the M1 at Junction 21). Take the A5460 towards Leicester city centre. Continue on this road, until you go under a railway bridge. Carry on for another 200 yards and turn right at the traffic lights into Upperton Road (sign posted Royal Infirmary) and then right again into Filbert Street for the stadium. Allow yourself a little extra time to get to the ground as traffic does tend to get quite congested near the stadium. Recently a number of 'Residents Only Parking' schemes have been implemented on streets off the A5460 Narborough Road and Upperton Road, near to the ground, which means that street parking now has to be found further away from the stadium. You can park on side streets off Narborough Road but located further back in the direction of the outskirts of Leicester that you will have travelled through, (if approaching from J21 of the M1) but this may then mean a 20+ minute walk to the King Power Stadium.

Alternatively you can park at Leicester Rugby Club (£10) which is a ten minute walk away from the stadium. Dan Willatt a visiting Nottingham Forest fan advises; 'The Police close a number of roads around the stadium for up to 40 minutes after the final whistle to allow fans to disperse. We parked at a car park located in Filbert Street, but in the end in took us well over an hour in queueing traffic to get away from the ground. It may be best to consider parking further away from the stadium if you want a quick exit.' This official car park in Filbert Street has to be pre-booked with the Club and costs £15 per car.
Post Code for Sat Nav: LE2 7FL