Με την ακύρωση δρομολογίου γίνεται επιστροφή του ναύλου.

In this sentence, με + accusative is being used in a formal, administrative way to express the circumstance in which something happens.

So Με την ακύρωση... means:

• upon cancellation
• in the event of cancellation
• when there is a cancellation

This is a common extension of με, especially in notices and official language.

Την ακύρωση is accusative singular, because it follows the preposition με.

A few details:

• dictionary form: η ακύρωση = the cancellation
• accusative form: την ακύρωση

So:

• η ακύρωση = nominative
• την ακύρωση = accusative after με

Because it depends on ακύρωση and tells you what is being cancelled.

So:

• ακύρωση δρομολογίου = cancellation of a route / service / scheduled departure

This is a very common Greek pattern:

• noun + genitive noun
• the cancellation of the service
• the return of the fare
• the payment of the ticket

Here, δρομολόγιο is the noun being linked to ακύρωση, so it becomes δρομολογίου.

Because Greek often omits the article in formal or general expressions of this type.

So ακύρωση δρομολογίου sounds like:

• cancellation of a service
• cancellation of a scheduled route/departure

If Greek used του δρομολογίου, it would sound more like a specific, already identified service:

• the cancellation of the service

Without the article, it is more general and typical of official notices.

Δρομολόγιο can mean different but related things depending on context:

• route
• itinerary
• scheduled service
• scheduled departure / trip

In transport language, it often refers to a bus, ferry, train, or other scheduled run.

So in this sentence, δρομολογίου most likely means something like:

• a scheduled service
• a scheduled trip
• a departure

That is the basic meaning of γίνομαι: become, happen, take place.

But in formal Greek, γίνεται is also often used in impersonal or administrative expressions to mean something like:

• is made
• takes place
• is carried out

So γίνεται επιστροφή means:

• a refund is made
• a refund is issued
• there is a refund

It is a very common official style.

Because Greek often prefers a noun + γίνεται structure in formal notices.

So instead of a direct verbal structure, it uses:

• γίνεται επιστροφή = a refund is made

This sounds official and impersonal, which is common in announcements, regulations, and ticketing language.

A more direct version could be:

• επιστρέφεται ο ναύλος

That would also mean the fare is refunded.

For the same reason that δρομολογίου is genitive: it depends on a noun.

Here the noun is επιστροφή:

• επιστροφή του ναύλου = refund/return of the fare

So ναύλος changes to ναύλου because it is linked to επιστροφή.

This is another very common pattern in Greek:

• επιστροφή χρημάτων = return of money
• επιστροφή φόρου = tax refund
• επιστροφή του ναύλου = refund of the fare

Not exactly.

Ναύλος means:

• fare
• passage fare
• the amount paid for transport, especially in travel contexts such as ships, ferries, or other transport services

It is about the cost, not the physical ticket itself.

So:

• εισιτήριο = ticket
• ναύλος = fare

In some contexts they are closely related, but they are not the same word.

It is natural, but it is formal and administrative.

It sounds like something you would read in:

• ticket conditions
• a ferry or bus company notice
• terms and conditions
• an official announcement

In everyday conversation, a Greek speaker might say something more direct, such as:

• Αν ακυρωθεί το δρομολόγιο, επιστρέφεται ο ναύλος.
• Αν ακυρωθεί το δρομολόγιο, σας επιστρέφουμε το ναύλο.

So the original sentence is correct, but it belongs to a more official register.

Greek word order is more flexible than English word order, especially in formal writing.

The sentence begins with the condition:

• Με την ακύρωση δρομολογίου = upon cancellation of a service

Then it gives the result:

• γίνεται επιστροφή του ναύλου = a refund of the fare is made

This ordering is very typical of notices and policy statements: first the situation, then the action taken.