The Machame route is the most popular path. It is the route of choice for many people because it provides impressive views and a variety of habitats. About 50% of all climbers, and most seasoned climbers, choose the Machame route.
The Marangu route is one of the most popular routes to the summit of Kilimanjaro. This could partly be as a result of the fact that the Marangu is the least expensive route, but more so, perhaps the fact that it is possible to do the Marangu route in 5 days.
The Lemosho Route is a newer route on Mount Kilimanjaro that approaches from the west. It is a difficult and long route, but one that is favored by most reputable Kilimanjaro outfitters due to its smaller crowds, scenic variety and high success rates.
The Rongai Route is the only route that appraoches Kilimanjaro from the north, near the Kenyan border. Rongai's ascent profile is very similar to that of Marangu. It is one of Kilimanjaro's easier routes. The climb to the top is gradual and steady.