Llegamos al mediodía en punto.

Al is the contraction of a + el.

In this expression, Spanish often uses el mediodía to refer to noon, so a + el mediodía becomes al mediodía.

• a + el = al
• Llegamos al mediodía = We arrived at noon

You may sometimes hear a mediodía in some places or contexts, but al mediodía is a very common and safe choice.

Llegamos can be either:

• present tense: we arrive
• preterite (simple past): we arrived

So by itself, llegamos is ambiguous. Context tells you which meaning is intended.

Examples:

• Llegamos al mediodía en punto. = We arrived at exactly noon.
• Mañana llegamos al mediodía en punto. = Tomorrow we arrive at exactly noon.

This is very normal in Spanish.

Spanish often leaves out subject pronouns because the verb ending already shows who the subject is.

• llegamos already tells you it is we
• so (nosotros) llegamos is usually shortened to just llegamos

Including nosotros is possible, but it usually adds emphasis, contrast, or clarity.

• Nosotros llegamos al mediodía en punto, no ellos.

Without that special reason, Spanish normally omits it.

En punto means exactly, on the dot, or sharp when talking about time.

So:

• al mediodía = at noon
• al mediodía en punto = at exactly noon / at noon sharp

It emphasizes that the arrival was not approximate.

Other examples:

• a las tres en punto = at three o’clock exactly
• a la una en punto = at one o’clock sharp

Because en punto normally comes after the time expression it modifies.

So Spanish says:

• a las cinco en punto
• a medianoche en punto
• al mediodía en punto

Putting en punto before the time expression would sound unnatural in normal speech.

By itself, al mediodía can sometimes be understood a little more loosely as around noon / at midday, depending on context.

That is exactly why en punto is useful here: it removes any vagueness and makes the time precise.

• Llegamos al mediodía. = maybe at noon or around noon
• Llegamos al mediodía en punto. = exactly at noon

Yes. Llegamos a las doce en punto is also correct and natural.

Both mean essentially the same thing:

• al mediodía en punto = at exactly noon
• a las doce en punto = at exactly twelve

The version with mediodía sounds a bit more like noon, while a las doce sounds like the clock time twelve. In this context, they usually refer to the same moment.

Not really in the same way.

In this sentence, al mediodía is a time expression, not a destination.

• Llegamos al mediodía en punto. = We arrived at exactly noon.

Compare that with a destination:

• Llegamos al hotel. = We arrived at the hotel.

So the English word at can match different Spanish structures. Here, al mediodía tells you when, not where.

It is spelled mediodía with an accent on í.

That accent helps show the pronunciation: me-dio-DÍ-a. The í and a are pronounced in separate syllables.

So it is:

• me-dio-dí-a

not:

• me-dio-dia as one blended syllable at the end

This is why the written accent is important.

They are different:

• mediodía (one word) = noon / midday
• medio día (two words) = half a day

So in your sentence, mediodía must be one word.

Examples:

• Llegamos al mediodía. = We arrived at noon.
• Trabajé medio día. = I worked half a day.

This is a very common thing learners ask about.

Yes. Llegamos al mediodía en punto is natural and easy to understand across Latin America.

It sounds clear and standard. Depending on the country or speaker, you might also hear alternatives such as:

• Llegamos justo al mediodía.
• Llegamos al mediodía exacto.
• Llegamos a las doce en punto.

But the original sentence is perfectly good Spanish.