Church in Alba
There is no airport in Alba, Italy so if you are planning to visit Alba you will have to fly into a nearby city.
There are several close airports to Alba, so your choice depends on what airlines fly from your home city to Italy and what your preferred method of airport transfer is.
Genoa (Genova) airport, Turin airport, and the Milan airports (Malpensa, Linate, and Bergamo) are the closest airports to Alba. The Turin and Genoa airports are slightly closer than the Milan airports, but many transcontinental flights only arrive in Milan. Bergamo airport is the farthest of all of them.
From all of the airports, it is possible to get to Alba by train or driving. You can find more information about how to get from each one to Alba here.