Flight Heathrow Airport departs from London Heathrow Airport at 20:30 and arrives at Kigali Kigali International Airport at 07:00.
The flighttime is about 11h 30m. The distance travelled ("as the bird flies"): 6590 Km. So the average speed is roughly 573 Km.
There is an 1 hour time difference between London and Kigali