Delays in sea transportation may occur at different stages of the logistics chain, from the time of booking up to final delivery. Broadly speaking, the reasons can be examined under several main categories:

1. Environmental and Natural Factors

• Adverse weather conditions such as storms, waterspouts, heavy waves, and dense fog
• Ice formation on certain sea routes
• Natural disasters such as tsunamis or undersea earthquakes
• Reduced visibility at sea, which causes vessels to slow down

2. Port Congestion and Capacity Limitations

• Congestion of vessels at anchorage and waiting time for berthing
• Shortage of berths or port equipment
• Limited capacity at container terminals
• Slow loading and unloading operations
• Breakdown of cranes and port equipment

3. Shipping Line-Related Issues

• Changes in vessel schedules
• Port omission from the vessel’s route
• Delay in the vessel’s arrival at the previous port
• Overbooking or acceptance of cargo beyond capacity
• Lack of vessel space

4. Vessel and Equipment Technical Problems

• Engine failure or navigation system malfunctions
• Technical issues in the vessel’s safety systems
• Need for emergency repairs during transit
• Problems related to containers or cargo-handling/storage equipment

5. Documentation and Customs Issues

• Incomplete shipping documents such as the Bill of Lading, Invoice, or Packing List
• Discrepancies between documents and the actual cargo
• Delays in issuing or amending documents
• Customs or security inspections
• Issues related to import or export regulations

6. Cargo-Related Problems

• Improper packaging or cargo damage
• Misdeclaration of the type of goods
• Failure to declare dangerous goods
• Discrepancies in the cargo’s weight or quantity compared to the declaration

7. Logistical and Operational Problems

• Delay in delivering the container to the port of origin
• Shortage of containers or transport equipment
• Delay in moving goods from the warehouse to the port
• Problems in inland transportation before or after sea freight

8. Financial and Contractual Issues

• Failure to pay freight charges on time
• Financial disputes between the cargo owner and the carrier
• Problems related to the Letter of Credit (L/C)
• Cargo being held due to unpaid debts or charges

9. Transshipment Problems

• The container missing the connecting vessel
• Delay of the second vessel at the transshipment port
• Congestion at international hub ports

10. Human Factors

• Operational errors by port staff or shipping company personnel
• Poor transport planning
• Labor shortages
• Strikes by port workers or shipping line staff

11. Security and Political Factors

• Wars and regional tensions
• Sanctions and trade restrictions
• Intensive security inspections on certain routes
• Piracy in some regions

12. Emergency Conditions and Global Events

• Pandemics and health-related restrictions
• Closure of major maritime routes such as the Suez Canal or Panama Canal
• Energy or fuel crises