I just had a quick look at British Airways timetables - and they state between 3 hours 45 minutes to 4 hours as the flight time.
8hr 15min to 8hr 50min, LHR to DEL by a nonstop flight operated by Air India, British Airways, Jet Airways or Virgin Atlantic.
8hr 05min to 8hr 20min by a nonstop flight operated by Air India, British Airways, Jet Airways or Virgin Atlantic.
flight time from heathrow to Singapore
A flight from Heathrow to Adelaide would take about 21 hours.
9hr 10min to 9hr 40min Delhi (DEL) to London Heathrow (LHR) by a nonstop flight operated by British Airways, Jet Airways or Virgin Atlantic.
11,975 miles
the flight time from Paris to heathrow is 50 min to one houre
2.5 hours direct flight
The flight time is 6 hours.
How long flight from London to Karrachi
From London Heathrow to Cancun, Mexico flight time around 8 hours
1 hour
4.50 hours.
Easyjet have no flights out of Heathrow. Try Gatwick instead.