Air

All internal flights are fully booked way in advance for travel in December and January, Easter, and in July. Flights to El Calafate, Ushuaia, Bariloche and Puerto Iguazú are particularly heavily booked, and if travelling during these periods, consider booking at least your first internal flight before you leave home. Outside busy periods, it's usually possible to book internal flights with just a few days' notice, though note that flights to Ushuaia are always heavily booked. It's wise to leave some flexibility in your schedule to allow for bad weather, which may delay flights in the south, at El Calafate and Ushuaia. Meals are rarely served on internal flights, though you'll get a hot drink and a cake. Don't lose your baggage ticket; you won't be able to collect your bags without it.