Getting to Cambridge:
By Train: See National Rail.
By Coach: See National Express.
By Air: Within Europe by far the easiest way to fly to Cambridge is via London Stansted Airport (STN). From overseas you can fly into Heathrow Airport or Gatwick Airport, and then take a train or coach (see above). Trains are usually faster but require one connection, while the coach is direct, but somewhat slower.
Getting to the University: