First a flight from the capital of Chile Santiago to the Balmaceda Airport at Coyhaique, located at the Chilean Patagonia. From there at approximately 5 hours by vehicle is Puerto Guadal. From this point there are tours available to hike and climb the Leones Glacier.
I highly advise to take a guided tour to this place, otherwise it is almost impossible to reach this location.
After spending a night beside this glacier, we hiked one hour to reach the ice. Once we were on the ice climbing the experience was humbling.