Please be aware that London has multiple airports and that these results are for all airports serving the city.
The best month to arrive at London is November and the most expensive month to fly is September. (Average prices, based on 605 datapoints.)
The best day to arrive at London is Wednesday and it would be best to avoid Thursday, as prices are on average 98.69% higher than on Wednesday. (Average prices, based on 633 datapoints.)
The cheapest airline flying to London is Iberia Airlines. They are 90% cheaper than United Airlines. (Average prices, based on 743 datapoints.)
At London the most flights depart around 07:00. (Hourly flights, based on 2251 datapoints.)
From London it is on average the cheapest to fly to Amsterdam and to Madrid. (Average prices, based on 171 datapoints.)
From London most of the flights depart to Amsterdam, second best connected from London is New York. (Daily flights, based on 529 datapoints.)