Based on joint service of KLM / Air France you may consider to book attractive return flights from Europe to Lima, capital of South American Peru. Cheap return flights from Benelux to Peru are now starting at €500. If interested please look for round trip flights from Brussels or Luxembourgh to Lima. Abovementioned fare includes all taxes and fees as well as checked luggage.
*UPDATE*.: Adding one more solution with British Airways when departing from Amsterdam. Return flights are now available already from €451. Note that in most of cases airport change in London is request. Associated transfer costs are not included in the ticket. You may also consider to book open jaw flights with return to London already for £370. Limited travel options are available till end of June then from September till December 2016. Valid for bookings made till 22nd of May. Travel dates is fastest to check directly with BA.
In case of interested in this KLM / Air France promotional sale please look for flights in travel period till end of June 2016. (Based on date of your outbound flight to South America). This offer is valid for bookings made till 17th of May 2016 or until sold out. Please refer to below booking samples to Lima if interested in this deal.
Air France / KLM
Another suggestions to Central and South America
Travel dates. Vary by each origin. The easiest way to find the lowest fare available are directly with the airline. They are offering +- 3 days searching view. All these European cities are well connected by many low cost airlines. To make a basic idea how to reach them from your hometown you may use service of Skyscanner. To book some afforeable accommodation in Peru you may use Booking.com or consider following promo codes offered by Ebookers, Hotelopia or Venere.
Booking sample of cheap return flights from Benelux to Peru from €451! In this case you would be flying from Amsterdam to Lima on 23rd of October 2016. Your return flight from South America to The Netherlands would take place on 16th of November 2016.