The nearest airport is at El Calafate, 137 miles away. There are bus lines departing from downtown El Calafate. The frequencies depend on the season, low season being from April through October, with only one bus per day. This bus leaves El Calafate in the morning and arrives back from El Chaltén late afternoon. During high season, from November through March, there are two buses in the morning from El Calafate and two buses in the afternoon from El Chaltén, every day.
Not exactly, it is next to Lake Viedma and to Mounts Fitz Roy and Torre. You can reach both by well-signaled roads that will lead you to the bases in a few hours through a beautiful landscape of glacial, lagoons and lakes.
Because several trekking excursions leave from El Chaltén to visit the surrounding areas, some paths are easy to follow, others are more complex and require a specialized trekking guide.
Two would be the minimum number of nights to really enjoy the place. Although this place is attractive enough to stay longer than that.
Although it is possible to make a round trip to El Calafate using the line buses, we don´t recommend it. You would be travelling a total of 274 miles in one day, having only 4 hours left in El Chaltén for any activities, meals, etc. It´s also worth mentioning that the most interesting trekking options are about 8 to 9 hours long, so they would be impossible to make in such a short time.