Normally, the best time to visit a place varies depending on the purpose and travel preferences. If you are prioritizing the budget over experience, the best time could be any time during the off-season or shoulder season. However, if you want pleasant weather and the best travel experience, you may want to consider flying during the peak season. I would rather suggest you fly out to Peru anytime between May and September, if planning a solo or group travel in 2026, as you will find clear skies and fewer crowds at cost-effective airfare.