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Café con hielo vs. café helado

While both terms relate to cold coffee, they describe very different preparation methods. Café con hielo is a simple method involving hot coffee and ice cubes, whereas café helado usually implies a blended beverage or a dessert-like drink with ice cream.

Café con hielo

A1
This technically translates to coffee with ice and is the standard way to order iced coffee in Spain. It consists of two parts: a cup of hot espresso and a separate glass containing ice cubes, requiring you to pour the hot coffee over the ice yourself.
Camarero, por favor tráigame un café con hielo y la cuenta.
(Waiter, please bring me a coffee with ice and the bill.)
Ten cuidado al verter el café con hielo para no quemarte.
(Be careful when pouring the coffee with ice so you do not burn yourself.)
En verano siempre tomo un café con hielo después del almuerzo.
(In summer I always have a coffee with ice after lunch.)

Café helado

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This term translates to iced coffee or frozen coffee and suggests a pre-mixed, cold drink. It is often closer to a frappé or a milkshake and, in countries like Chile, typically includes a scoop of vanilla ice cream and whipped cream.
Voy a pedir un café helado con mucho chocolate.
(I am going to order an iced coffee with a lot of chocolate.)
El café helado es perfecto para una tarde calurosa en la playa.
(Iced coffee is perfect for a hot afternoon at the beach.)
No me gusta el café helado porque es demasiado dulce.
(I do not like iced coffee because it is too sweet.)

Summary

Use café con hielo if you want a hot espresso served with separate ice cubes to cool down manually. Use café helado if you are looking for a prepared, cold beverage that is often blended or served with ice cream like a dessert.