*UPDATE* Just a bump as this excelent offer is still valid! Cheap open-jaw tickets to Peru are currently available to book using the service of American Airlines. The cheapest flights are available from October till 31st of March 2014 and are starting at extraordinary rate €481!
These are open-jaw air tickets meaning that you will depart from and/or arrive to different airport than the origin one. In this case the cheapest flights are on route Barcelona/Madrid – Lima – London/Manchester, air tickets are available from €481.
Another solution is routing Barcelona/Madrid – Lima – Frankfurt/Dusseldorf/Munich or Stuttgart where the air tickets are starting at €552.
Return flights on route Barcelona/Madrid – Lima are available from €533
*UPDATE* One more route Barcelona/Madrid – Lima – Brussels is allowing to book air tickets for a still reasonable rate starting at €585.
In case of booking please bear in mind that holding US visa or ESTA certificate is mandatory.
Booking is available directly at www.aa.com – go “refine your search” and then choose “multi-city” sheet.