Walking to or from the airport to in Bergamo, Italy

Of course  you can use bus for a couple of €, but it is also very walkable.

It is about 4km from train station in Bergamo to the airport terminal.

I spend a day in Bergamo, was packed light and had time, so decided to walk. I used Google maps to get there. First you have to go through the train station tunnel to pass tracks, then it is a trail along the river for quite a bit. Then a sidewalk. You will cross first highway over the bridge and second under the tunnel with some graffiti. There is a small section  maybe 100 meters that you have to walk on a road and last part is around airport runway.