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Cusco's airport doesn't handle long-haul international flights — nearly all travelers fly internationally into Lima first, then take a short domestic connection to Cusco (around 1.5 hours) on LATAM or another Peruvian carrier. Book the international leg and domestic hop together or separately depending on price.
Dry season (April–October, especially June–August) is peak for trekking and Machu Picchu, with the best weather and highest fares. Wet season (November–March) is cheaper but rainier, and some trails close in February for maintenance.
The international Lima leg has no dedicated low-cost carrier; the Lima–Cusco domestic hop is a separate, usually inexpensive booking — plan for two fares rather than one, and book both within the optimal window.
4 to 6 weeks out on full-service carriers, or 3 to 5 weeks out on lower fare classes, for the international leg into Lima. Book the Lima–Cusco domestic hop alongside it.
Wet season (November–March) is generally cheaper, though the Inca Trail sometimes closes in February for maintenance. Dry season (April–October, especially June–August) is peak trekking season and the most expensive.
There's no direct international service to Cusco — you'll book an international flight to Lima plus a separate domestic hop, so timing both legs matters more than a simple budget-vs-premium choice.
US citizens can currently visit Peru visa-free for short tourist stays, typically up to 90 days — the same entry rules apply whether you're headed to Lima or Cusco.