Flight Heathrow Airport departs from London Heathrow Airport at 09:55 and arrives at Amsterdam Amsterdam Airport Schiphol at 12:20.
The flighttime is about 1h 25m. The distance travelled ("as the bird flies"): 588 Km. So the average speed is roughly 415 Km.
There is an 1 hour time difference between London and Amsterdam
The best day to arrive at London is Wednesday and it would be best to avoid Monday, as prices are on average 402.15% higher than on Wednesday. (Average prices, based on 1495804 datapoints.)
We have a lot more statistics for flights KL 1004 and between London and Amsterdam.
THB