Unfortunately, Liverpool Street station does not have lifts from it’s platforms to street level, so you wouldn’t be able to take the underground from Liverpool Street Station to Kings Cross Station step-free. Here are some options:
Take the bus
You can take either the 214 or the 205 between Liverpool Street Station and London Kings Cross. The 214 leaves from stop C, makes 10 stops and takes around 17 minutes. The 205 leaves from stop F, makes 15 stops and takes around 26 minutes. Note: during rush hour you should leave longer than the times stated for bus journeys.
Take the Circle, Hammersmith & City or Metropolitan line and get help going up and down the stairs
It is worth noting that the Circle, Hammersmith & City and Metropolitan lines are only a couple of flights of stairs down at both Kings Cross and Liverpool Street. So if you’re travelling with a stroller and able to carry it up and down stairs (or have someone help you) then this route could be an option. I always find stairs easier than escalators with a double stroller because people often offer to help.
All three of these lines go from London Liverpool Street directly to London Kings Cross, so it’s a quick and easy journey. Despite the rather unsavoury reputation of Londoners I’ve found that people are generally very nice and helpful. Personally I’d take this route and bank on getting help on the stairs.
Go from Shoreditch High Street to Caledonia Road & Barnsbury on the Overground and walk/take the bus the rest of the way
Depending on exactly where you’re going from, this could be a viable route. If you’re literally going from Liverpool Street to Kings Cross it’s probably quicker to take the bus. However, if you’re going from or to the surrounding areas then these stations might be close enough to work well.
Shoreditch High Street has step-free access from train to street. It’s about a 10 minute walk from London Liverpool Street Station here.
Caledonia Road & Barnsbury is an overground station just North of Kings Cross. They have ramps up to the station, plus lifts to and from the platforms. It’s about a 20 minute walk to Kings Cross Station.
Correct as of July 2017