Is London Heathrow the only airport in London?

No, there are 3 airports in London. These are London Heathrow , London Gatwick and London Stansted .

What is the busiest day to depart from London Heathrow Airport?

The day with the most flights departing from London Heathrow Airport in the past week was Monday, with 3,009 flights leaving the airport.

London Heathrow (LHR) - Flight status, maps & more

LHR

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Is London Heathrow the only airport in London?
No, there are 3 airports in London. These are London Heathrow, London Gatwick and London Stansted.
What is the busiest day to depart from London Heathrow Airport?
The day with the most flights departing from London Heathrow Airport in the past week was Monday, with 3,009 flights leaving the airport.