How long is the flight between England and Greece?

Answer 1

A random search for flights from London All Airports (LON) to Athens (ATH) shows:

3hr 45min Luton (LTN) to ATH EasyJet Flt 2001 Dep 01:55pm 13Nov,Fri

3hr 45min London Heathrow (LHR) to ATH BMI British Midland Airways Flt 6003 Dep 12:45pm 13Nov,Fri
3hr 45min London Heathrow (LHR) to ATH BMI British Midland Airways Flt 6007 Dep 08:20pm 13Nov,Fri
3hr 35min London Heathrow (LHR) to ATH British Airways Flt 634 Dep 06:40pm 13Nov,Fri

3hr 40min London Gatwick (LGW) to ATH EasyJet Flt 5085 Dep 09:00am 13Nov,Fri
3hr 40min London Gatwick (LGW) to ATH EasyJet Flt 5087 Dep 03:05pm 13Nov,Fri
etc.

Answer 2

4 hours