saw an article today, Ryanair will be starting a service from (London, Essex) Stansted airport to Basel from April 2014
Stansted to London destinations.
Depends where in London you want to get to.
There is the Express Stansted British Rail service to London Liverpool Street, makes a one stop at
Tottenham Hale (Tube /undersground) Victoria Line, zone 3, see tube map whether convenient to you? (Strongly suggest you either have an Oyster Card before you travel or get it at Tottenham Hale before you travel further; cost saving & also very convenient.)
There are a number of cheaper coach options into London.
Ryanair do offer one as part of their check out at a reduced rate. Important for you to note where your drop-off/ pick up point for the coach in London would be, if you have no idea of London, ask for advice here.
Also be aware to find out where exactly the points of picking up the coach in London would be, i.e. Liverpool Street, I once had an extremely long walk from one side of Liverpool Street round to the other side for the coach with suitcase & hand luggage in tow!
Did a quick search of coach services to London, one for £9 one way for London Victoria. Cheapest train fare £23.40 one way or £32.80 return
There is plenty of parking at Stansted at a Price
It is a large airport so also seems to take a while to get through, luggage drop off, customs/scanning, passport control & then the final walk to to boarding gate. as I rarely use it, I like to allow myself an hour or 2 to get through them all. If you do more often, guess you can cut the time.