Heathrow...
But it may be worth noting that Southampton has it's own Regional Airport.
Airlines like Flybe and Air France fly there!
The two closest airports are Bournemouth Airport (BOH) and Southampton Airport (SOU), both of which are about 35 miles from Stonehenge. The closest major international airport is London Heathrow (LHR), about 75 miles from Stonehenge.
The closest airport to Southampton [all one word] is Eastleigh Airport. It is not an international airport. You don't saym where you will flym from but assuming you are coming from USA you will need to fly into Heathrow and take the train down to Southampton.
London City Airport.
London Heathrow Airport is nearest airport to Hayes in London
London City airport is nearest to the US embassy in London.
The nearest airport to the London Olympic stadium is the London City Airport in east London.
London City is the closest (in a straight line)
Heathrow
Slough is closest to Heathrow airport in London.
The airport code for Southampton Airport is SOU.
Southampton Airport was created in 1917.
Heathrow