Geçiş ücreti seyir süresine göre değişiyor.

It breaks down into three main parts:

• Geçiş ücreti = the passage fee / transit fee / toll
• seyir süresine göre = according to the travel/voyage duration
• değişiyor = is changing / varies

So the basic structure is:

• subject/topic
  • according-to phrase
    • verb

A very literal version would be:

• The passage fee changes according to the voyage duration.

A more natural English translation is often:

• The fee varies depending on the travel duration.

Because Turkish often combines two nouns using an indefinite noun compound.

The pattern is:

• noun 1 + noun 2-(s)I

Here:

• geçiş = passage, crossing, transit
• ücret = fee
• ücreti = fee of passage / passage fee

So geçiş ücreti means passage fee or transit fee.

This is a very common pattern in Turkish:

• otobüs durağı = bus stop
• öğrenci kartı = student card
• yol ücreti = road fee

Because in that noun-compound pattern, the second noun takes the suffix -(s)I.

So:

• ücret
  • -i → ücreti

This suffix is often called the third-person possessive suffix, but in compounds it does not necessarily mean literal possession in the English sense. It is just how Turkish normally forms compounds like:

• geçiş ücreti = passage fee
• bilet fiyatı = ticket price
• kitap kapağı = book cover

So ücreti here does not mean his/her fee by itself. In this sentence, it is part of the compound geçiş ücreti.

Yes. It is another noun compound.

• seyir = travel, navigation, voyage, cruising, movement along a route
• süre = duration, time
• süresi = duration of travel / voyage duration

So seyir süresi means something like:

• travel duration
• voyage duration
• navigation time
• trip duration

Exactly which English wording sounds best depends on context. If this is about ships, ferries, or waterways, voyage duration or navigation time may fit well.

Because göre requires the noun before it to be in the dative case.

The pattern is:

• X-e / X-a göre = according to X

Here the base is:

• seyir süresi = travel duration

Then it becomes dative:

• seyir süresi
  • -ne → seyir süresine

So:

• seyir süresine göre = according to the travel duration

The extra -n- appears because süresi already has a possessive ending, and Turkish uses a buffer n before adding the case ending.

Breakdown:

• süre = duration
• süre-si = its duration / duration of travel
• süre-si-ne = according to/to its duration

Göre is a postposition meaning:

• according to
• based on
• in relation to
• depending on

It comes after the noun phrase, unlike English prepositions, which come before.

So:

• seyir süresine göre = according to the voyage duration

A useful pattern to remember is:

• fiyata göre = according to the price
• hava durumuna göre = according to the weather
• kişiye göre = according to the person

Yes, literally değişiyor is the present continuous form of değişmek, meaning to change.

But in modern Turkish, the -iyor form is used very often not only for actions happening right now, but also for:

• current situations
• ongoing states
• general patterns that are true at present

So here değişiyor is very naturally understood as:

• varies
• changes
• is variable depending on...

It does not have to mean that the fee is actively changing at this exact second.

Yes, you could, but the nuance is a little different.

• değişir sounds more like a general rule, habitual truth, or formal statement
• değişiyor sounds more like the currently operating situation or system

So:

• Geçiş ücreti seyir süresine göre değişir = The fee varies according to the voyage duration.
  This sounds a bit more timeless or rule-like.

• Geçiş ücreti seyir süresine göre değişiyor = The fee varies according to the voyage duration.
  This sounds a bit more like how things are currently set up.

In many real situations, both are possible.

Turkish normally puts the verb at the end of the sentence.

So this order is very natural:

• Geçiş ücreti seyir süresine göre değişiyor.

But Turkish word order is somewhat flexible, especially for emphasis. For example:

• Seyir süresine göre geçiş ücreti değişiyor.

This still means basically the same thing, but it puts more focus on seyir süresine göre.

What usually stays most stable is that the finite verb is near or at the end.

Turkish does not have articles like English the and a/an.

So geçiş ücreti by itself can be interpreted from context. In English, you might translate it as:

• the passage fee
• a passage fee
• simply the fee

In a sentence like this, English often uses the because it sounds like a specific fee being discussed in context.

So the absence of an article in Turkish is completely normal.

Yes. In natural English, that is often the best choice.

Turkish uses değişmek + -e göre very naturally here, but in English we often say:

• The fee depends on the travel duration.
• The fee varies depending on the voyage time.

So even though the Turkish verb literally means changes, the best English translation may use depends on or varies depending on.

A few sounds here are especially important for English speakers:

• ç in geçiş = like ch in church
• ş in geçiş and değişiyor = like sh in ship
• ü in ücreti / süresine = a front rounded vowel, similar to German ü or French u
• ğ in değişiyor is usually not a hard g sound; it often lengthens or smooths the previous vowel

Very roughly:

• geçiş ≈ geh-chish
• ücreti ≈ üj-reh-ti
• değişiyor ≈ deh-ee-shee-yor, with the ğ not strongly pronounced as a separate consonant

You do not need to force a hard g in değişiyor.