How old to fly alone and do i have to have a parent at the place im going?

I want to go to London but from the stuff im reading you have to have a parent or guardian there or they wont let u leave is that true or is that only with the unaccompanied minor service thing?How old to fly alone and do i have to have a parent at the place im going?
you have to be 13How old to fly alone and do i have to have a parent at the place im going?
you must be 18 if you want to go alone.for a certainity you can check with the airline you want to fly
Check the airline but I think you need to be sixteen or older to fly alone.