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Regresar vs. volver

In Spanish, both regresar and volver generally mean to return or to go back to a place. While they are often interchangeable regarding physical movement, they have distinct grammatical uses when expressing repetition or changes in state.

Regresar

A2
This verb is primarily used to describe the physical act of returning to a place, a person, or a previous situation. It is often considered slightly more formal than volver in some regions, but its main focus is strictly on the movement backward to a point of origin.
Tengo que regresar a casa antes de la medianoche.
(I have to return home before midnight.)
¿Cuándo piensan regresar de sus vacaciones?
(When do you plan to return from your vacation?)
El perro se escapó, pero regresó por la mañana.
(The dog ran away, but he came back in the morning.)
Ella decidió regresar a su antiguo trabajo.
(She decided to go back to her old job.)
Por favor, regrese a su asiento.
(Please return to your seat.)

Volver

A1
While volver also means to return to a place, it is a much broader verbs. It is uniquely used with the preposition a (volver a + infinitive) to mean to do something again, and it is used reflexively as volverse to mean to become or to change dramatically.
Espero volver a verte pronto.
(I hope to see you again soon.)
No vuelvas a decir eso nunca más.
(Do not ever say that again.)
Mi hermano vuelve a la universidad en septiembre.
(My brother goes back to university in September.)
Con el tiempo, el hombre se volvió muy amargado.
(Over time, the man became very bitter.)
El dolor de cabeza ha vuelto.
(The headache has returned.)

Summary

For simple physical movement, you can use either regresar or volver. However, use regresar closer to the formal English sense of returning to a specific origin. Use volver when you want to express repetition (doing something again) or a personal transformation (becoming).