Try Iberia Air of Spain, websites Skyscanner, Kayak or Booking. (com) Best place to find deals in my experience to US is Lima, Peru to Miami,Florida or New York City. From Europe then to Sao Paulo/Rio in Brazil or Santiago in Chile. Article below has other information/ideas/suggestions.

Best Connections From Europe To South America | Way To Adventure

Discover the European cities with the most connections to South America and the cheapest flight connections between Europe and South America.

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If you’re looking for good flight deals from Europe (or the eastern U.S.) to South America, try checking websites like Skyscanner, Google Flights, and SecretFlying. They often show cheap flights, last-minute deals, or cancellations. The most popular airports in South America where you're likely to find better deals include São Paulo (Brazil), Bogotá (Colombia), Lima (Peru), Buenos Aires (Argentina), and Santiago (Chile). Flying from big cities like Madrid, Lisbon, Paris, or New York usually gives you the best prices. Flexibility with your travel dates can also help you find cheaper options.