Jadwal saya minggu ini cukup padat.

Indonesian often leaves out the verb to be when linking a subject to an adjective or noun.

So:

• Jadwal saya minggu ini cukup padat
  literally: My schedule this week quite busy/dense

In natural Indonesian, this already means My schedule is quite busy this week.
You do not need a separate word like is here.

Jadwal means schedule, timetable, or agenda, depending on context.

In this sentence, jadwal saya means my schedule.

It is a very normal and natural choice. Depending on context, Indonesians might also use:

• agenda = agenda, planned activities
• kegiatan = activities
• rencana = plans

But for my schedule is quite busy this week, jadwal saya is completely appropriate.

In Indonesian, possession is usually shown by putting the possessor after the noun.

So:

• jadwal saya = my schedule
• rumah saya = my house
• teman saya = my friend

This is different from English, where my comes before the noun.

So jadwal saya is the standard way to say my schedule.

Minggu ini means this week.

In Indonesian, ini and itu usually come after the noun they modify:

• minggu ini = this week
• buku ini = this book
• hari itu = that day

So the order is:

• noun + ini/itu

That is why it is minggu ini, not ini minggu in this sentence.

Yes, minggu can sometimes mean Sunday, but context usually makes the meaning clear.

• Minggu ini most often means this week
• hari Minggu ini more clearly means this Sunday

In your sentence, because it talks about a schedule being quite busy, minggu ini is naturally understood as this week.

Cukup here means quite, fairly, or rather.

So:

• cukup padat = quite busy / fairly packed

It softens the statement a little. It is not as strong as saying the schedule is extremely full.

Compare:

• padat = busy, packed
• cukup padat = quite busy
• sangat padat = very busy
• terlalu padat = too busy

Padat literally means dense, packed, or crowded.

When used for a schedule, it means the schedule is full, tight, or busy.

So jadwal ... padat is a very natural way to say:

• a busy schedule
• a packed schedule
• a tight schedule

It does not mean busy in the sense of a person actively doing something at the moment; it describes how full the schedule is.

Both are possible.

• Jadwal saya minggu ini cukup padat
• Minggu ini jadwal saya cukup padat

The difference is mainly focus and style.

• Jadwal saya minggu ini cukup padat starts with my schedule
• Minggu ini jadwal saya cukup padat starts with this week, so it emphasizes the time first

Both are natural. The original sentence sounds very normal and balanced.

Yes, but it is slightly different in structure.

• Jadwal saya minggu ini cukup padat = My schedule this week is quite busy
• Saya punya jadwal yang cukup padat minggu ini = I have a quite busy schedule this week

Both are natural. The original version is a little more direct and compact.
The version with punya and yang is also correct, but a bit longer.

Not in the original sentence.

In Jadwal saya minggu ini cukup padat, cukup padat directly describes jadwal saya minggu ini as the predicate.

You would use yang more often when the adjective phrase directly modifies the noun inside a noun phrase:

• jadwal yang cukup padat = a quite busy schedule

So:

• Jadwal saya minggu ini cukup padat = complete sentence
• jadwal yang cukup padat = noun phrase, not a full statement by itself

Yes, saya is more neutral and polite.
Aku is more informal and personal.

So you could say:

• Jadwal saya minggu ini cukup padat = neutral/polite
• Jadwalku minggu ini cukup padat = informal, more personal

You could also say:

• Jadwal aku minggu ini cukup padat

But jadwalku is often more natural than jadwal aku in casual speech or writing.

Indonesian nouns do not change form the way English nouns sometimes do.

So:

• jadwal = schedule
• jadwal saya = my schedule
• jadwal mereka = their schedule / their schedules

Possession is shown by word order, not by changing the noun itself.

Plurality is also often left unmarked unless needed from context. If you specifically wanted schedules, you might say:

• jadwal-jadwal

But in everyday Indonesian, context usually handles this.

It is very natural.

Jadwal saya minggu ini cukup padat sounds like standard, everyday Indonesian that a native speaker could easily say in conversation or writing.

It works well in situations like:

• explaining why you are busy
• declining an invitation
• talking about work or school plans

It is neither overly formal nor overly casual, so it is a very useful sentence pattern to learn.