No tenemos ni idea del horario.

Tenemos is the we form of the verb tener (to have) in the present tense.

• yo tengo = I have
• tú tienes = you have
• él/ella tiene = he/she has
• nosotros/nosotras tenemos = we have

So No tenemos... means We don’t have...

Ni idea is a very common expression meaning no idea or not the slightest idea.

In this sentence, No tenemos ni idea literally looks like We do not have not-even an idea, but in natural English it means:

• We have no idea
• We don’t have any idea

The word ni adds emphasis, similar to not even.

Because in Spanish, ni idea normally appears with no in this structure.

So the full pattern is:

• No tengo ni idea = I have no idea
• No tenemos ni idea = We have no idea

If you said Tenemos ni idea, it would sound wrong.

Ni often means nor or not even.

In No tenemos ni idea, it emphasizes the negative idea:

• No tenemos idea = We have no idea
• No tenemos ni idea = We have absolutely no idea / We don’t have the slightest idea

So ni makes the statement stronger and more idiomatic.

Because de + el contracts to del in Spanish.

So:

• de + el = del
• a + el = al

That is why you say:

• del horario = of the schedule

But this contraction does not happen with la:

• de la hora
• de la escuela

Horario usually means schedule, timetable, or hours depending on context.

Examples:

• el horario de clases = class schedule
• el horario del tren = train timetable
• el horario de atención = opening hours / business hours

In No tenemos ni idea del horario, it usually means the schedule or the timetable, depending on the situation.

Because the fixed expression is no tener ni idea — literally, to not have even one idea.

Spanish often uses the singular in this idiom:

• No tengo ni idea
• No tienen ni idea

You would not normally say No tenemos ni ideas here.

Yes, but it means something slightly different.

• No tenemos ni idea del horario = We have no idea about the schedule / We don’t know anything about the schedule
• No sabemos el horario = We don’t know the schedule

The original sentence sounds stronger and more natural when you want to emphasize total ignorance.

Because idea de is a common pattern in Spanish when talking about what the idea is about.

So:

• idea de algo = idea about something

Examples:

• No tengo ni idea de eso = I have no idea about that
• No tiene ni idea de matemáticas = He/She has no idea about math
• No tenemos ni idea del horario = We have no idea about the schedule

Yes. No tenemos idea del horario is understandable and correct.

But No tenemos ni idea del horario is more idiomatic and more emphatic. It sounds closer to:

• We have absolutely no idea about the schedule
• We have no clue about the schedule

So both are possible, but ni idea is very common in everyday speech.

Yes, very common. No tener ni idea is widely used across Latin America and Spain.

You may also hear close alternatives like:

• No tenemos idea
• No tenemos la menor idea = We haven’t the slightest idea
• No tenemos ni la menor idea = We have absolutely no idea
• No sabemos nada del horario = We know nothing about the schedule

But the original sentence is natural and very common.

Yes. The structure stays the same; only the verb changes.

Examples:

• No tengo ni idea del horario. = I have no idea about the schedule.
• No tienes ni idea del horario. = You have no idea about the schedule.
• No tiene ni idea del horario. = He/She/You-formal has no idea about the schedule.
• No tienen ni idea del horario. = They/You-plural have no idea about the schedule.

So the pattern is:

No + form of tener + ni idea de/del + noun

No. Spanish usually leaves subject pronouns out when the verb already shows who the subject is.

So:

• No tenemos ni idea del horario. = perfectly natural
• Nosotros no tenemos ni idea del horario. = also correct, but more emphatic

You would add nosotros only if you want contrast or emphasis, such as:

• Nosotros no tenemos ni idea del horario, pero ellos sí. = We have no idea about the schedule, but they do.