How to Say "a wonder" in Spanish
The Spanish word for “a wonder” is “milagro” — B1 level. This is a very common word in everyday Spanish.

Examples
Llegó al aeropuerto de milagro, justo antes de que cerraran la puerta.
He arrived at the airport by a miracle (just barely), right before they closed the gate.
¡Qué milagro verte por aquí! Hace años que no coincidíamos.
What a miracle to see you here! We haven't run into each other for years.
Using 'De Milagro'
The phrase 'de milagro' is used when something happened but it was a very close call or was extremely difficult: 'Ganamos el partido de milagro' (We won the game by the skin of our teeth).
Confusing literal/figurative
Mistake: “Using 'un milagro' when you mean 'a coincidence' ('una casualidad').”
Correction: Use 'milagro' only when the event feels truly astounding or impossible. If it's just a small coincidence, use 'casualidad'.
Learn Spanish with Inklingo
Interactive stories, personalized learning, and more.