Can I cancel my journey in case of significant delay? Does the carrier have to reimburse the amount paid for the flight ticket?

You can cancel the journey without sanction when the expected delay is at least 5 hours. In this case, the carrier is obliged to reimburse the amount paid for the flight ticket. This applies also to passengers who booked their tickets that cannot be returned or changed due to tariff conditions. If you choose reimbursement, you automatically lose the right to free care from the carrier.