Brazilian airlines AZUL are offering attractive return flights from Lisbon to Buenos Aires, Argentina. Book round trip flights from Portugal to this South American country already for €361. In some cases airport change in Sao Paulo is required, make sure you book a flight with appropriate time to transfer.
This AZUL promotional sale is valid for limited flight options mainly within May and June 2016. Book by 7th of February 2016. Please refer to below booking sample if interested in this deal. The easiest way to check your connection possibilities is through Skyscanner. This tool gives you quickly a rough idea which low-cost airlines are connecting your home town.
Booking sample
Travel date samples
10. - 25.5.
12. - 26.5.
17.5. - 2.6.
9-16.6.
Booking sample of cheap return flights from Lisbon to Argentina from €361 here. In this case you would be departing from Portugal to Buenos Aires on 12th of May. You would be returning from South America back to Europe on 26th of May 2016. Note that there is airport change on your outbound flight.