Combine these flights with your international ticket (if any).

WE flew from BA to Salta and then our guide in Salta suggested the overnight bus to Mendoza - the bus was first class all the way - seats that reclined into beds, meal service and our own TV -the arrangement of the bus seats are staggered so they seem like a private "room". If I remember we left Salta just before dinner and arrived in Mendoza early in the morning. Seemed like a much better idea than flying to Mendoza via Salta to BA and then back to Mendoza - Happy Travels

Another vote for the bus! We spent 5 months in South America travelling almost exclusively by bus. The services are reliable, extremely comfortable in Ejecutivo class and around one third the cost of the airfare plus you save on the cost of accommodation as long trips are scheduled overnight. Mendoza to Salta was a diddle but Salta to Iguazu was our longest trip at around 20 hours which, although not as bad as it might sound, is one route you may wish to consider flying. Tickets are easy to arrange a couple of days in advance at the bust station or, I believe you can now book online.