Mi padre está de viaje por el trabajo.

Questions & Answers about Mi padre está de viaje por el trabajo.

Why do we use está here instead of es if viaje is a noun?
We use está because estar de viaje is a fixed phrase describing a temporary state, meaning "to be traveling" or "to be away on a trip." Even though viaje is a noun, the phrase de viaje functions like an adjective describing your father's current status.
Could I say está en un viaje instead of está de viaje?
You could, but estar de viaje is the most natural and common way to say someone is "away on a trip" or "out of town." Saying está en un viaje sounds slightly unnatural, focusing heavily on the physical trip itself rather than the person's status of being away.
Why is it por el trabajo and not para el trabajo?
We use por because it indicates the reason, cause, or motive of the trip. He is traveling "because of" or "due to" work. If you used para, it would incorrectly suggest the trip is a destination or purpose belonging to the work itself.
Why does trabajo have the article el here when English just says "for work"?
Spanish often uses definite articles for general concepts where English drops them. However, in this context, both por el trabajo and simply por trabajo are perfectly correct and commonly used by native speakers. Adding el just sounds slightly more specific to his actual job.

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