An alternative solution to Buenos Aires is available from Copenhagen with Turkish Airlines. You would have to accept overnight stay in Istanbul and additional stop in Sao Paulo on your way. Return flights from Copenhagen to Argentina are now starting at just €433. All charges and fees and checked luggage are included in this fare. Need a budget option to this usually fairly expensive destination and you dont mind not a perfect transit time this is an interestiong solution…
This deal with Turkish Airlines is available throughout year 2016 and in first quarter of 2017. Blackout period in July / August and around Christmas holidays. Travel dates are the easiest to check directly with the carrier. To book your accommodation in Argentina you may use service of Booking.com or consider following promo codes offered by Otel.com, Hotelopia or Venere or Hotels.com.
Booking sample of cheap return flights from Copenhagen to Argentina from €433! In this case you would depart from Denmark to Buenos Aires on 30th of October 2016. Your return flight from South America back to Europe would be on 19th of November 2016.