Ha a cím hibás, a csomag valószínűleg később érkezik.

Because Hungarian usually omits the present-tense form of to be in the third person when the predicate is a noun or adjective.

So:

• a cím hibás = the address is incorrect
• literally: the address incorrect

This is completely normal Hungarian.
If the sentence were in the past or future, or with I/you, the verb would usually appear.

For example:

• A cím hibás volt. = The address was incorrect.
• Én hibás vagyok. = I am wrong / at fault.

Hungarian very often uses the present tense to talk about the future when the future meaning is already clear from context.

Here, the sentence clearly refers to a later result:

• Ha... = If...
• később = later

So érkezik naturally means will arrive in English.

This is very common in Hungarian. English often needs will, but Hungarian often does not.

Ha means if.

It introduces a condition:

• Ha a cím hibás... = If the address is incorrect...

This is the standard word for everyday conditional sentences.

Because Ha a cím hibás is a subordinate clause, and Hungarian normally separates subordinate clauses from the main clause with a comma.

So the structure is:

• Ha a cím hibás, = If the address is incorrect,
• a csomag valószínűleg később érkezik. = the package will probably arrive later.

This comma is standard and important in written Hungarian.

Because a is the Hungarian definite article, meaning the.

So:

• a cím = the address
• a csomag = the package

Hungarian has two forms of the definite article:

• a before consonant sounds
• az before vowel sounds

Since cím and csomag both begin with consonants, Hungarian uses a.

For comparison:

• az адрес would not be Hungarian, but
• az utca = the street

Yes. Cím can mean both address and title, depending on context.

For example:

• a könyv címe = the title of the book
• a csomag címe or simply a cím in this context = the address

In this sentence, because we are talking about a csomag (the package), cím clearly means address.

Hibás means faulty, incorrect, wrong, erroneous. It fits very well with things like:

• an address
• data
• a form
• a machine
• a decision

So a cím hibás means the address is incorrect.

Rossz usually means bad in a broader sense. Sometimes it can also mean wrong, but hibás is more precise and more natural for an incorrect address.

So:

• hibás cím = incorrect/faulty address
• rossz cím can also occur, but hibás sounds more exact here

Később means later.

Yes, it is historically/compositionally a comparative form related to késő (late), but in actual usage you can simply learn it as the normal adverb later.

In this sentence:

• később érkezik = arrives later / will arrive later

Hungarian can use később even when no explicit comparison is stated. The comparison is understood from context, such as later than expected or later than normal.

Valószínűleg means probably.

In this sentence it comes before később érkezik:

• a csomag valószínűleg később érkezik

That is a very natural placement.

Hungarian word order is flexible, but moving valószínűleg can change emphasis slightly. The version in your sentence is a neutral, natural way to say it.

Very roughly:

• A csomag valószínűleg később érkezik. = neutral
• Valószínűleg a csomag később érkezik. = more emphasis on probably
• A csomag később érkezik valószínűleg. = possible, but less neutral

Yes. You may also hear:

• Ha hibás a cím, ...

Both are correct, but the emphasis is a little different.

• Ha a cím hibás is a neutral way to say if the address is incorrect
• Ha hibás a cím puts more focus on hibás — roughly if the address is wrong

Because Hungarian often omits is, word order becomes especially important for nuance and emphasis.

Yes, it is natural.

A native speaker could also say similar versions, for example:

• Ha a cím hibás, a csomag valószínűleg későn érkezik.
• Ha hibás a cím, a csomag valószínűleg később érkezik.

But your original sentence is perfectly normal and clear.

A small nuance:

• később érkezik = arrives later
• későn érkezik = arrives late

Both can work, but később suggests later than expected / later than it otherwise would, while későn focuses more directly on being late.

Because érkezik is an intransitive verb: it does not take a direct object.

Hungarian has different verb conjugation patterns depending on whether there is a definite object, but that matters mainly with transitive verbs.

Here:

• a csomag is the subject
• érkezik = arrives

The package is not doing something to an object; it is simply arriving. So érkezik is exactly the form you would expect.