På lørdag vil vi gå til loppemarkedet og se efter et lille møbel til entreen.

Both are possible in Danish, but på lørdag is a very common way to mean on Saturday / this coming Saturday.

• på = on
• lørdag = Saturday

So På lørdag works much like English On Saturday.

In everyday Danish, you may also hear just lørdag, depending on context, but på lørdag is very natural and common.

This is because Danish has verb-second word order in main clauses.

When something other than the subject comes first, the finite verb usually comes next.

Compare:

• Vi vil gå til loppemarkedet. = We want/will go to the flea market.
• På lørdag vil vi gå til loppemarkedet. = On Saturday, we will/want to go to the flea market.

Here, På lørdag takes the first position, so the verb vil must come before the subject vi.

This is one of the most important word-order patterns in Danish.

It can be a little tricky, because vil can mean both will and want to, depending on context.

In this sentence, it most naturally suggests something like:

• we’re going to
• we want to
• we plan to

So På lørdag vil vi gå... can feel a bit like On Saturday, we’ll go... or On Saturday, we want to go...

In everyday Danish, context usually makes the meaning clear.

Not necessarily.

gå til can sometimes literally mean walk to, but in many contexts gå til simply means go to / attend.

So here:

• gå til loppemarkedet = go to the flea market

It does not strongly focus on the method of transport. If the speaker wanted to be very clear about physically walking there, context or wording would usually make that clearer.

Loppemarkedet is the definite form: the flea market.

• et loppemarked = a flea market
• loppemarkedet = the flea market

Danish often adds the definite article as an ending:

• et marked → markedet
• et loppemarked → loppemarkedet

Here, the speaker probably has a specific flea market in mind, so the definite form is used.

Se efter is a very common expression meaning:

• look for
• look around for
• keep an eye out for

So:

• se = see / look
• se efter = look for

In the sentence:

• se efter et lille møbel = look for a small piece of furniture

This is similar to how English uses verb + particle combinations such as look for.

Because møbel is a neuter noun in Danish, so it takes et.

• et møbel = a piece of furniture / a furniture item

In Danish, nouns are either common gender (en-words) or neuter (et-words). You usually have to learn the gender with the noun.

So:

• et møbel
• et lille møbel

This is a good question because many Danish adjectives add -t with et-words, but lille is irregular.

For many adjectives:

• en stor bil
• et stort hus

But lille stays lille:

• en lille bil
• et lille hus
• et lille møbel

So even though møbel is an et-word, the adjective remains lille, not lillet.

Møbel means piece of furniture or furniture item.

So et lille møbel does not mean furniture in the general mass-noun sense of English furniture. It means one individual item, such as:

• a small table
• a small bench
• a small cabinet

That is why Danish can use et møbel where English usually prefers a piece of furniture.

Til entreen means for the entrance hall / hallway / foyer.

• til = for / to
• entreen = the entrance hall / foyer

So the idea is:

• et lille møbel til entreen = a small piece of furniture for the hallway/entryway

The exact English word depends on the home and the context:

• entryway
• hallway
• foyer
• entrance hall

Because entreen is the definite form of entré.

• en entré = an entrance hall / foyer
• entreen = the entrance hall / foyer

For many en-words, the definite form is made by adding -en:

• en bil → bilen
• en stol → stolen

Here:

• en entré → entreen

So til entreen literally means for the entrance hall.

Because Danish does not need an extra to there.

After vil, the main verbs stay in the infinitive form:

• vil gå
• vil se efter

And when two infinitives are joined by og (and), Danish simply uses:

• vil gå ... og se efter ...

So the structure is:

• vil
  • infinitive + og
    • infinitive

This is very normal in Danish.

A more neutral word order would be:

• Vi vil gå til loppemarkedet og se efter et lille møbel til entreen på lørdag.

That also means the same thing.

The version in your sentence:

• På lørdag vil vi...

puts special focus on the time: On Saturday, we...

So the difference is mostly about emphasis and sentence structure, not basic meaning.