It is 5238 miles from Sheffield to San Francisco

According to this calculator

Why should you care? Well the question's posed by the Arctic Monkeys' song Fake Tales of San Francisco. Possibly the only song in the world to namecheck Hunter's Bar.

He talks of San Francisco, he's from Hunter's Bar
I don't quite know the distance
But I'm sure that's far
Yeah I'm sure that's pretty far

It is indeed pretty far, it's 5238 miles.