The Coffee Base
The primary distinction between these two drinks is how the coffee is brewed.
Café au lait (French for "coffee with milk") is made with hot brewed coffee, typically from a drip machine or a French press. The milk is heated and added to the coffee in a roughly 1:1 ratio. Because the base is filtered coffee, the drink has a clean texture and feels lighter overall.
A latte is built on espresso. Espresso is coffee extracted under high pressure, which extracts oils and solids that drip brewing does not. When mixed with steamed milk, these oils create a creamy, unified drink that feels thicker and more integrated than a café au lait.
Good to Know: The New Orleans Tradition
While a standard café au lait is simply coffee and milk, you may encounter a specific version in New Orleans. This variation is often made with chicory, a root that is roasted and ground with the coffee beans. Chicory adds a woody, slightly chocolate-like bitterness that stands up well to the sweetness of the milk. It is a regional staple traditionally served alongside beignets (ben-YAYs) — deep-fried squares of dough covered in powdered sugar.
Texture and Milk Preparation
Beyond the coffee, the milk is handled differently. In a latte, the milk is steamed to create microfoam—tiny bubbles that create a smooth, uniform texture. In a traditional café au lait, the milk is often heated or scalded but not necessarily frothed. This results in a liquid texture rather than the airy, soft top found on a latte.
Caffeine Content
Caffeine levels vary based on the volume of the cup and the strength of the brew. A 12oz café au lait made with strong drip coffee often contains more caffeine than a single-shot latte. Because robusta beans or longer brew times are common in drip coffee, a café au lait can contain more caffeine than expected despite its mild flavor.
Where to Find Them
Lattes are the standard milk drink in almost every modern café. Café au lait is less common in specialty coffee shops unless it is specifically listed. You are more likely to find it in traditional French-style bakeries, diners, or older coffee houses where drip coffee is the primary focus.