O voo vai sair amanhã de manhã.

In everyday Brazilian Portuguese, the structure ir + infinitive is very common for talking about the future.

So vai sair literally looks like is going to leave, but in normal usage it often just means a plain future idea: will leave.

• O voo vai sair amanhã de manhã. = very natural in speech
• O voo sairá amanhã de manhã. = correct, but more formal or less common in everyday conversation

A learner should get very used to this pattern:

• vou viajar
• vamos chegar
• eles vão ligar

It is one of the most common ways to express the future in Brazilian Portuguese.

Yes. Sair basically means to leave, to go out, or to depart, depending on context.

With transportation, especially buses, trains, and flights, sair often means to depart.

So in this sentence:

• o voo vai sair = the flight is going to depart

Portuguese often uses everyday verbs in a broader way than English does. English may prefer depart, but Portuguese is very comfortable using sair.

Portuguese uses definite articles much more often than English.

So o voo literally means the flight, and that sounds completely normal even when English might sometimes drop the article in certain contexts.

In Portuguese, using the article here is the most natural choice:

• O voo vai sair amanhã de manhã.

If you say just voo, it would usually sound incomplete unless it appears in a special context, like a headline, a label, or a very shortened style of speech.

That is just the standard modern spelling of the noun voo.

It comes from the verb voar and means flight. Brazilian Portuguese spelling was simplified in some areas, and older spellings with accents that learners may sometimes encounter are no longer standard.

What matters for you is:

• voo = flight
• voar = to fly

So:

• O voo = the flight

In Brazilian Portuguese, voo is usually pronounced in two syllables, roughly like VO-o.

A simple learner-friendly approximation is:

• voo ≈ VOH-oo

The two vowels are both heard, even though in fast speech they can sound very close together.

So it is not pronounced like a single English-style voh. It is more like:

• vo-o

Amanhã de manhã is the normal and natural order.

Portuguese usually places the time word amanhã first, then adds the more specific period:

• amanhã de manhã = tomorrow morning
• amanhã à tarde = tomorrow afternoon
• amanhã à noite = tomorrow night

So the sentence flows from a broader time reference to a more specific one.

While Portuguese word order can sometimes vary for emphasis, amanhã de manhã is the standard phrase you should learn as a chunk.

De manhã is the normal expression for in the morning or in the morning period.

Portuguese uses fixed time-of-day expressions:

• de manhã = in the morning
• à tarde = in the afternoon
• à noite = at night / in the evening

You do not need to translate the de literally every time. It is simply part of the standard expression.

So:

• amanhã de manhã = tomorrow morning

This is something best learned as a set phrase rather than analyzed word by word too much.

You could, but it is much less natural in ordinary conversation.

• amanhã de manhã = the normal everyday way
• na manhã de amanhã = possible, but more marked, more formal, or used in a context where the speaker wants a more structured phrasing

For a learner, the safest and most natural choice is:

• amanhã de manhã

Not exactly, though they can be similar in some contexts.

• sair = leave / depart
• decolar = take off

For a flight:

• O voo vai sair às 8. usually refers to the scheduled departure
• O voo vai decolar às 8. specifically refers to the plane taking off

In real life, a flight can sair first and decolar a bit later, because departure can refer to leaving the gate or beginning the process of departure.

So sair is broader and very common in travel language.

Yes. That is also very natural.

Portuguese often uses the present tense to talk about scheduled future events:

• O voo sai amanhã de manhã.
• O voo vai sair amanhã de manhã.

Both are common. The difference is small:

• sai can sound a bit like a schedule or fixed plan
• vai sair makes the future idea more explicit

In everyday Brazilian Portuguese, both are perfectly normal.

Yes, often you can.

• amanhã de manhã = tomorrow morning
• amanhã cedo = tomorrow early / early tomorrow morning

The difference is that cedo adds the idea of early.

So:

• O voo vai sair amanhã de manhã. = the flight leaves tomorrow morning
• O voo vai sair amanhã cedo. = the flight leaves early tomorrow morning

Use cedo only if you want that extra idea of earliness.