Flight Heathrow Airport departs from London Heathrow Airport at 14:50 and arrives at Madrid Adolfo Suárez Madrid–Barajas Airport at 18:20.
The flighttime is about 2h 30m. The distance travelled ("as the bird flies"): 1268 Km. So the average speed is roughly 507 Km.
There is an 1 hour time difference between London and Madrid