Go through your results for flights to Cuzco in Peru with Netflights. Although KLM usually has the best prices, it's best to double check what's available for your travel dates.
Flexible on dates? Conducting your search by month allows you to compare prices to Cuzco throughout the year. For example, prices will almost certainly be higher around August, as this is peak season in Cuzco. Accommodation prices will also be higher at this time of year. Flights to Cuzco are usually cheapest in January.
Today alone, we've compared 25 flights worldwide, so you're bound to find one that works for you. Look out for flights with KLM, as they often have good deals. Or broaden your search by looking at other airports in Peru.
For even more options, check what other airports you could fly to Cuzco from. You might be able to make a saving by going from a different airport or city.