AreaWalk to Museums entrance
Immediately around St. Peter's Square5–10 minutes
Prati10–15 minutes
Ottaviano10–15 minutes

The historic centre is the outlier — a 20–25 minute walk, or a short bus/taxi ride, so most visitors based there treat the Vatican as a dedicated half-day trip rather than a walk-over.

Several of the closer streets are cobbled rather than paved, which matters more for a wheeled suitcase or a stroller than the walking time alone suggests — worth factoring in alongside the minutes on a map.