Minä matkustan Tukholmaan huomenna.

• Minä = I
• matkustan = travel / am traveling in the 1st person singular
• Tukholmaan = to Stockholm
• huomenna = tomorrow

So the structure is basically:

subject + verb + destination + time

Yes. Very often, you can.

Finnish verb endings usually show the subject clearly, and matkustan already means I travel / I am traveling. So:

• Minä matkustan Tukholmaan huomenna
• Matkustan Tukholmaan huomenna

are both correct.

Including minä can add emphasis, contrast, or clarity, especially if you want to stress I.

Because -n is the ending for the 1st person singular in the present tense.

The basic verb is matkustaa = to travel.

Its present-tense forms include:

• minä matkustan = I travel
• sinä matkustat = you travel
• hän matkustaa = he/she travels
• me matkustamme = we travel
• te matkustatte = you (plural) travel
• he matkustavat = they travel

So matkustan specifically tells you the subject is I.

Because Finnish usually marks movement into / to a place with a case ending instead of a separate word like to.

Here, Tukholmaan is the form meaning to Stockholm.

This is the illative case, which often expresses movement toward the inside of a place or into a destination.

So:

• Tukholma = Stockholm
• Tukholmaan = to Stockholm

In this sentence, English uses a separate word (to), but Finnish puts that meaning into the ending.

Not always. -maan is the correct form for Tukholma, but Finnish place names do not all form destination cases in exactly the same way.

For many place names, movement to the place uses one of the local cases, often the illative, but the exact form depends on the word.

For this specific word, just learn:

• Tukholma
• Tukholmassa = in Stockholm
• Tukholmasta = from Stockholm
• Tukholmaan = to Stockholm

That pattern is very useful to memorize as a set.

Because Finnish normally uses the present tense for future meaning when the time is clear from context.

Here, huomenna already tells you that the action is in the future, so Finnish does not need a separate future tense form.

That is very normal in Finnish:

• Lähden huomenna = I’m leaving tomorrow
• Tulen ensi viikolla = I’ll come next week

So matkustan is present tense in form, but future in meaning because of huomenna.

Yes. Finnish word order is quite flexible.

This sentence is correct, but you could also say:

• Matkustan Tukholmaan huomenna
• Huomenna matkustan Tukholmaan
• Tukholmaan matkustan huomenna

These versions all mean roughly the same thing, but the emphasis changes.

For example:

• Huomenna matkustan Tukholmaan emphasizes tomorrow
• Minä matkustan Tukholmaan huomenna can emphasize I
• Tukholmaan matkustan huomenna emphasizes the destination

So word order in Finnish often helps show what is being highlighted.

It is a time adverb, meaning tomorrow.

It tells you when the action happens. It does not change according to person, and you can place it in different parts of the sentence depending on emphasis:

• Matkustan huomenna Tukholmaan
• Huomenna matkustan Tukholmaan
• Matkustan Tukholmaan huomenna

All of these are natural.

Both can work, but they are not exactly the same.

• matkustaa = to travel
• mennä = to go

Matkustaa focuses more on the act of traveling or making a trip.
Mennä is more general.

So:

• Matkustan Tukholmaan huomenna = I’m traveling to Stockholm tomorrow
• Menen Tukholmaan huomenna = I’m going to Stockholm tomorrow

In many situations, both are possible, but matkustaa may sound a bit more like an actual journey.

Because Finnish does not have articles like a, an, or the.

So where English says to Stockholm, Finnish just says Tukholmaan.

This is true generally in Finnish:

• kirja can mean a book or the book, depending on context
• Tukholma is just Stockholm, with no article needed

So the absence of the is completely normal.