The Boise Airport is just four miles — a seven-minute drive — from the heart of downtown Boise. Flights tend to be the cheapest in August. If you live in the continental United States and prefer a more scenic journey, Boise is also accessible by train from 54 other U.S. cities. To explore downtown Boise, you can get around to most places on foot, but if you want to trek further afield, renting a car is your best bet.