Old Feb 25, 14, 8:59 am
  #11  
Cymro
 
Join Date: Aug 2010
Location: München, Germany
Programs: BA GGL+CCR, Hertz PC, Hilton Diamond
Posts: 5,317
The very cheapest way, if you are well served by it, will be Megabus to Victoria, District Line to Earls Court or South Ken and then Piccadilly to Heathrow.

The disadvantage is that you will be limited in your options as to which flights you can take without staying the night before.
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