Disculpe el retraso.

Disculpe comes from the verb disculpar.

In this sentence, it is the usted imperative form, used to address one person formally. In practice, it works like please excuse or forgive.

A useful grammar note: the usted imperative has the same form as the present subjunctive, so disculpe is both:

• the present subjunctive form of yo / él / ella / usted
• the command form for usted

Here, it is clearly being used as a polite command/formula.

Yes. It is formal because disculpe addresses usted.

In Spain, usted is used, but it is noticeably more formal than in many Spanish-speaking countries. So this sentence sounds polite, respectful, and a bit formal.

If you were speaking casually to one person, you would more likely say:

• Disculpa el retraso
• Perdona el retraso
• Perdón por el retraso

Related forms:

• disculpa = informal, one person
• disculpe = formal, one person
• disculpad = informal, several people, common in Spain
• disculpen = formal, several people

Because Spanish often uses imperative forms as polite formulas, not as harsh commands.

So disculpe does not sound like ordering someone to do something. It is a conventional way of saying:

• please excuse
• forgive
• pardon

This is similar to English expressions like Excuse me or Pardon me, which are also not felt as literal commands in normal use.

Because disculpar can take a direct object in Spanish.

So:

• Disculpe el retraso = literally Excuse the delay

English often uses for, but Spanish does not have to here.

Compare:

• Disculpe el retraso
• Perdón por el retraso

Both are natural, but the grammar is different:

• disculpar often takes the thing directly
• perdón commonly goes with por

So this is a good example of where Spanish does not copy English structure word for word.

Because Spanish often uses the definite article when the possession is obvious from context.

Here, everyone understands that it is your delay, so el retraso is enough.

This is very common in Spanish. The language often avoids possessives when they are unnecessary.

So:

• Disculpe el retraso sounds natural and idiomatic
• Disculpe mi retraso is possible, but more explicit and a bit less natural in many everyday situations

Using el also helps the phrase feel like a standard apology formula.

Yes, especially in formal speech, customer service, announcements, or writing.

It sounds natural in contexts like:

• an email
• a message replying late
• a receptionist or employee apologizing
• a formal conversation

In everyday casual Spain Spanish, people might more often say:

• Perdón por el retraso
• Perdona el retraso
• Siento el retraso
• Perdona por llegar tarde if the delay is specifically arriving late

So Disculpe el retraso is correct and natural, but it leans formal.

A simple guide is:

dees-KOOL-peh el reh-TRAH-thoh

More accurately:

• disculpe → stress on cul
• retraso → stress on tra

In much of Spain, the z in retraso is pronounced like th in think:

• reh-TRAH-thoh

In Latin America, and also in some parts of Spain, it is pronounced with s:

• reh-TRAH-soh

A more phonetic version for standard Peninsular Spanish is:

• [dis-KUL-pe el re-TRA-tho]

Also note:

• the r in retraso is a light tapped r
• the e vowels are short and clear, not like English diphthongs

Yes.

Disculpe by itself is very common and can mean:

• Excuse me
• Sorry
• Pardon me

When you add el retraso, you make the reason explicit:

• Disculpe = general apology or attention-getter
• Disculpe el retraso = apology specifically for the delay

So the shorter version works when the context is already obvious.

Because Spanish usually leaves subject pronouns out when they are already clear from the verb form.

In commands especially, the pronoun is normally omitted:

• Disculpe rather than Usted disculpe

The verb ending already tells you this is the usted form.

If you did say usted, it would usually be for emphasis, contrast, or a special tone, not as the normal default.

So the sentence sounds natural precisely because it does not include the pronoun.