Leveringen kommer senere end forventet.

Because Danish usually makes the definite form by adding the article to the end of the noun.

• en levering = a delivery
• leveringen = the delivery

This is very common in Danish:

• en bog → bogen = the book
• en bil → bilen = the car

So leveringen is the subject and means the delivery.

Yes, kommer literally means comes, but in Danish it is also very natural to use komme when talking about an arrival happening at a certain time.

So:

• Leveringen kommer senere = The delivery is coming later / arrives later

In English, we might say The delivery is arriving later, The delivery will come later, or The delivery is delayed depending on context. Danish often uses komme in this kind of sentence.

Danish, like English, often uses the present tense for future events when the context makes the future meaning clear.

So kommer is grammatically present tense, but it can refer to a future arrival:

• Bussen kommer klokken 8. = The bus arrives at 8.
• Han kommer i morgen. = He is coming tomorrow.

Here, Leveringen kommer senere means something like The delivery will arrive later.

Because senere is the comparative form, meaning later.

• sen = late
• senere = later

This sentence is making a comparison: the delivery comes later than something else. That is why the comparative form is needed.

Compare:

• Leveringen kommer sent. = The delivery arrives late.
• Leveringen kommer senere. = The delivery arrives later.

In Danish, end is used in comparisons, just like than in English.

So:

• senere end forventet = later than expected
• større end = bigger than
• bedre end = better than

A very common learner mistake is mixing up end and også / som-type structures. In this sentence, end is definitely the correct comparison word because senere is a comparative.

Here forventet means expected, and it works like a past participle used after than.

The phrase senere end forventet is a fixed and very common shorthand meaning:

• later than expected
• literally something like later than [was] expected

Danish often leaves out words that English also leaves out in this type of expression.

You could think of it as shortened from something like:

• senere end man havde forventet = later than one had expected
• senere end forventet = the more compact, natural version

So forventet is the natural form here.

Yes, but it is not exactly the same in tone.

• Leveringen kommer senere end forventet focuses on the arrival happening later than planned.
• Leveringen er senere end forventet sounds a bit less natural in many contexts, because levering is an event/arrival, and Danish often prefers kommer when talking about when it happens.

Very often, Danish speakers would also say:

• Leveringen er forsinket. = The delivery is delayed.

So kommer senere end forventet is a very natural way to talk about the timing of the arrival.

This is standard Danish main-clause word order:

1. Leveringen = subject
2. kommer = finite verb
3. senere end forventet = adverbial/comparative phrase

Danish is a verb-second language in main clauses, which means the finite verb normally comes in the second position.

That is why this sentence is structured very naturally as:

• Subject + verb + rest

If you move another element to the front, the verb still stays in second position:

• Senere end forventet kommer leveringen.

That version is grammatical, but much less neutral and much more marked.

It is a past participle form of forvente (to expect), but in this sentence it functions more like an adjective-like participle in a fixed comparison phrase.

You do not need to over-analyze it too much; the important pattern is:

• mere/mindre + adjective/adverb + end forventet
• adjective/adverb comparative + end forventet

Examples:

• dyrere end forventet = more expensive than expected
• sværere end forventet = more difficult than expected
• senere end forventet = later than expected

So learners often do best by remembering end forventet as a very common chunk.

Some common alternatives are:

• Leveringen er forsinket. = The delivery is delayed.
• Leveringen kommer lidt senere end forventet. = The delivery is coming a little later than expected.
• Din levering kommer senere end forventet. = Your delivery is coming later than expected.
• Pakken kommer senere end forventet. = The package is coming later than expected.

So the original sentence is perfectly natural, especially in service messages, delivery updates, and automated notifications.