Viajamos de ida y vuelta.

Because Spanish often drops subject pronouns when the verb ending already shows who the subject is.

• viajamos = we travel or we traveled
• The ending -amos tells you the subject is nosotros

So Nosotros viajamos de ida y vuelta is possible, but usually unnecessary unless you want emphasis or contrast.

Yes. For -ar verbs, the nosotros form of the present tense and the preterite can look exactly the same.

So viajamos can mean:

• we travel
• we are traveling (in some contexts)
• we traveled

Context tells you which meaning is intended.

For example:

• Cada verano viajamos de ida y vuelta. = present/habitual
• Ayer viajamos de ida y vuelta. = past

It is a fixed expression that functions like an adverbial phrase. It describes the type of travel: round trip, there and back, or with a return.

The parts are:

• ida = going, outbound trip
• vuelta = return, way back
• y = and

So literally it is something like of going and returning, but in natural English it means round trip or there and back.

Because this is a set expression. In Spanish, de is often used to classify or describe the kind of thing something is.

Examples:

• boleto de ida y vuelta = round-trip ticket
• pasaje de ida y vuelta = round-trip fare/ticket
• viaje de ida y vuelta = round trip

With viajar, the phrase still works naturally:

• Viajamos de ida y vuelta.

You do not translate the de word-for-word here. It is just part of the standard expression.

Because ida y vuelta works here as a fixed, idiomatic phrase. Spanish often leaves out articles in set expressions like this.

So you say:

• de ida y vuelta

not normally:

• de la ida y la vuelta

The version without articles is the standard one.

No. It is very common with tickets and transportation, but it can also describe the trip itself.

Common uses:

• un boleto de ida y vuelta
• un pasaje de ida y vuelta
• un viaje de ida y vuelta
• Viajamos de ida y vuelta.

So it can refer to either:

1. the ticket/fare, or
2. the actual travel pattern

Yes. De ida y vuelta is widely understood and natural across Latin America.

In some places, especially Mexico, you may also hear:

• viaje redondo
• boleto redondo

These also mean round trip. But de ida y vuelta is standard and broadly understood.

Yes. You can add where you traveled.

For example:

• Viajamos de ida y vuelta a Bogotá.
• Viajamos de ida y vuelta a Lima el mismo día.

That sounds natural and clearly means the trip included going and returning.

No.

• de ida y vuelta = round trip, there and back
• de vuelta = back, on the way back, returned

Compare:

• Viajamos de ida y vuelta. = We traveled there and back.
• Ya estamos de vuelta. = We are back already.

So de vuelta only refers to the return/back idea, not the full round trip.

Usually yes, but context still matters.

Viajamos de ida y vuelta strongly suggests that the trip included both the outbound and return parts. It does not usually mean a one-way trip.

If someone wanted to emphasize one-way travel, they would use something like:

• Viajamos solo de ida. = We traveled one way only.

So de ida y vuelta clearly points to a return being included.