Which Countries Have No Commercial Airports & Why?

There are several countries in the world that lack airports entirely (even more countries lack domestic airports). These countries are typically too small and dense to have an airport (or their geography doesn’t allow for it), and so they are dependent on neighboring countries for airport access (although they can have heliports). Notably, Ukraine is the largest country fully located in Europe, and it has many airports – however, due to the ongoing Russian invasion of Ukraine, there are no scheduled flights to the country, and its airspace is closed to commercial air traffic.