Karena transit kami cukup singkat, pramugari itu menyuruh kami tetap dekat gerbang keberangkatan.

Karena means because and introduces the reason.

So:

• Karena transit kami cukup singkat = Because our layover was fairly short

Indonesian often puts the reason first, just like English can. You could also reverse the order:

• Pramugari itu menyuruh kami tetap dekat gerbang keberangkatan karena transit kami cukup singkat.

Both are natural. When the karena clause comes first, a comma is commonly used before the main clause.

Because transit kami means our transit / our layover.

In Indonesian, possessors usually come after the noun:

• transit kami = our layover
• buku saya = my book
• teman mereka = their friend

If you said kami transit, that would look like we transit, which is not the intended structure here.

Here cukup means quite / fairly / rather.

So:

• cukup singkat = fairly short or quite short

Cukup can also mean enough, depending on context. For example:

• Uangnya cukup = The money is enough.

But before an adjective, it often works like an intensifier:

• cukup besar = fairly big
• cukup sulit = fairly difficult
• cukup singkat = fairly short

So in this sentence, cukup singkat is best understood as fairly short.

Yes. Transit is a very common borrowed word in Indonesian, especially in travel contexts.

It can mean:

• a transit stop
• a layover
• a transfer period between flights

Other expressions exist, but transit is very normal and natural in everyday use. You may also see:

• waktu transit = transit time / layover time
• masa transit = transit period

So there is nothing unusual about transit here.

Pramugari itu means that flight attendant or, in many contexts, simply the flight attendant.

In Indonesian, demonstratives like ini and itu usually come after the noun:

• pramugari itu = that/the flight attendant
• orang itu = that person
• buku ini = this book

The word itu often marks something as specific and identifiable from context. So here it points to a particular flight attendant already known in the situation.

Pramugari specifically refers to a female flight attendant.

The male form is:

• pramugara = male flight attendant

A more gender-neutral term is:

• awak kabin = cabin crew

So in this sentence, pramugari tells you the flight attendant was female.

Menyuruh means to tell someone to do something, to order, or to instruct.

The pattern is commonly:

• menyuruh + person + verb

So here:

• pramugari itu menyuruh kami tetap dekat gerbang keberangkatan
• literally: the flight attendant told us remain near the departure gate
• natural English: the flight attendant told us to stay near the departure gate

A few examples of the same pattern:

• Ibu menyuruh saya pulang. = Mom told me to go home.
• Guru menyuruh murid-murid duduk. = The teacher told the students to sit down.

Compared with meminta, menyuruh often sounds stronger and more directive.

Because after menyuruh, Indonesian very often uses a direct verb phrase without untuk.

So this is normal:

• menyuruh kami tetap dekat gerbang keberangkatan

You may also hear:

• menyuruh kami untuk tetap dekat gerbang keberangkatan

That version is also possible, but untuk is often omitted because it is not necessary.

So:

• menyuruh seseorang melakukan sesuatu = very common
• menyuruh seseorang untuk melakukan sesuatu = also possible

Here tetap means stay, remain, or keep being.

So:

• tetap dekat = stay near / remain close

Tetap often carries the idea of continuing in the same state:

• tetap tenang = stay calm
• tetap di sini = stay here
• tetap dekat gerbang = stay near the gate

In other contexts, tetap can also mean still or fixed/permanent, but here the meaning is clearly remain.

Because dekat can function very naturally as near / close to.

So:

• dekat gerbang keberangkatan = near the departure gate

You could also say:

• di dekat gerbang keberangkatan

That is also correct and perhaps a bit more explicitly locational. Both are natural.

Very roughly:

• dekat sekolah = near the school
• di dekat sekolah = in a place near the school

In this sentence, omitting di is perfectly normal.

Literally, gerbang keberangkatan is something like gate of departure.

Indonesian noun phrases usually go:

• main noun + modifier

So:

• gerbang keberangkatan = departure gate
• jadwal penerbangan = flight schedule
• kartu identitas = identity card

English usually does the reverse:

• departure gate
• flight schedule
• identity card

So the Indonesian order is normal.

Keberangkatan means departure.

It comes from the root:

• berangkat = to depart / to leave

Then Indonesian adds the circumfix:

• ke-...-an

This often turns a verb or adjective into an abstract noun. So:

• berangkat = leave, depart
• keberangkatan = departure

Some similar patterns:

• datang = come
  kedatangan = arrival
• berhasilan is not the standard form, but
  berhasil = succeed
  keberhasilan = success

So gerbang keberangkatan literally means departure gate.

Because kami means we/us but excludes the listener.

Indonesian distinguishes between:

• kami = we/us, not including you
• kita = we/us, including you

Here, the speaker is talking about the travel group, and the listener is apparently not part of it, so kami is correct:

• pramugari itu menyuruh kami... = the flight attendant told us...

If the listener were part of the same group, kita might be possible in another context, but not usually in this exact reporting structure.

Yes, that is completely natural.

Singkat means short or brief, and it can describe time periods very naturally:

• rapat singkat = a brief meeting
• kunjungan singkat = a short visit
• waktu yang singkat = a short time
• transit cukup singkat = a fairly short layover

So singkat works well here because the speaker is talking about the duration of the transit.