As far as I can see the only airlines flying from Stansted to Crete are Ryanair
. Ryanair flies from Stansted to Chania while Tui flies from Stansted to Heraklion. If you are prepared to widen the departure point Thomas Cook
flies from Gatwick to Heraklion and Easyjet
flies from Luton and Gatwick to Heraklion and Gatwick to Chania. Norwegian Air
also flies direct from Gatwick to Chania but use their site carefully. A lot of the flights shown are via Copenhagen or Oslo. I am not aware of other direct flights but other people may have ideas. Other methods of getting here involve stopovers in Athens and possibly other European airports.