Originally Posted by fedechat

LAN Argentina will cost you 12K AA miles for a R/T + USD25 (booking fee), you have to call the agent and check day by day since BA and QF will not show any LA/4M flights (for some reason, it does not work anymore).

For AR (Aerolineas Argentinas), it will cost you 20K Skymiles for a R/T but there is 4 seats available on each flight. Use http://www.wandr.me to find your seats and then call Delta, they will waive the fee (tell them that you can not do it online).