Transshipment (also spelled transhipment, the form most port authorities and bills of lading use) is when your container is discharged from one ship at an intermediate port and loaded onto another ship to finish its ocean journey. On a direct sailing, the box stays on the same vessel from the port of loading to the port of discharge. A large share of world container trade moves through hub ports this way: Busan Port Authority reported that transshipment made up about 57 percent of its 2025 volume. For a shipper, a transhipped routing mainly changes three things: transit time, the risk of the box being left behind at the hub, and what the transport documents show. It does not change the country of origin of the goods, a point that is often misunderstood and covered in detail below.
What transshipment is, and why carriers build networks around it
Container lines run a hub-and-spoke network. The largest ships, often called mainline or mother vessels, sail long-haul loops that call at a limited number of deep-water hubs. Smaller feeder vessels (some carriers now say shuttles) connect those hubs to the regional ports where demand is too thin, or the water too shallow, to justify a call by a mainline ship. A third pattern, usually called a relay, moves a box from one mainline service to another at a hub, for example from an Asia to Europe loop onto a service heading to East Africa or the Indian subcontinent.
The economics are simple: a large ship earns nothing while it sits in port, so every extra call costs the carrier days. Concentrating cargo at a few hubs lets the big ships keep moving and lets one feeder serve several small ports. It also lets a carrier offer far more port pairs than it could ever connect with direct services. When Maersk and Hapag-Lloyd launched their Gemini Cooperation in February 2025, they deliberately built it around hubs, including Tanjung Pelepas, Algeciras, Tanger Med and Salalah, linked by dedicated shuttles, and set a target of more than 90 percent schedule reliability. How well it works depends on the hubs; our overview of ocean carrier alliances in 2026 covers who sails with whom. On bookings and schedules, the hub is often shown as the T/S port, and the ship meant to take the box onward is the connecting vessel.
The main transshipment hubs, with their latest published volumes
Hub ports top the throughput tables partly because of how throughput is counted: a port records a container each time it is lifted off or onto a ship, so a transhipped box is typically counted twice at the hub, once on discharge and once on loading. Our guide to the busiest container ports explains why the largest number is not the whole story. Below are the hubs shippers most often see on Asia, Indian subcontinent, Mediterranean and Africa routings, with the 2025 figures each port or authority published.
| Hub (UN/LOCODE) | 2025 container throughput | Source and date | Role for shippers |
|---|---|---|---|
| Singapore (SGSIN) | 44.66 million TEU, up 8.6 percent on 2024 | Maritime and Port Authority of Singapore, 13 Jan 2026 | The world's largest transshipment hub; most boxes handled are transhipped (a share widely reported at around 80 to 85 percent, though MPA does not headline a current figure) |
| Busan (KRPUS) | 24.88 million TEU, of which 14.10 million TEU transshipment (about 57 percent) | Busan Port Authority figures, reported late Jan 2026 | Korea's main port and a major Northeast Asia relay hub |
| Tanjung Pelepas (MYTPP) | 14,028,375 TEU | Port of Tanjung Pelepas, Jan 2026 | Malaysia's main transshipment terminal, beside Singapore on the Strait of Malacca; a Gemini hub |
| Tanger Med (MAPTM) | 11,106,164 TEU, up 8.4 percent | Tanger Med Port Authority press release, 2 Feb 2026 | Strait of Gibraltar hub linking Asia, Europe, West Africa and the Americas; a Gemini hub |
| Colombo (LKCMB) | About 8.29 million TEU, up about 6 percent | Sri Lanka Ports Authority figures, reported Jan 2026 | The main hub for Indian subcontinent cargo; transshipment was 5.52 million of 6.92 million TEU in January to October 2025 (Central Bank of Sri Lanka data) |
| Algeciras (ESALG) | About 4.74 million TEU, up 0.5 percent | Port Authority of the Bay of Algeciras, reported Feb 2026 | Western Mediterranean hub opposite Tanger Med; a Gemini hub. Transshipment dipped slightly in 2025 while import and export boxes grew |
Which hub your box goes through depends on the carrier's network, not on the shortest line on a map.
Direct vs transhipped: what actually changes
| Factor | Direct sailing | Transhipped sailing |
|---|---|---|
| Transit time | Fixed by the vessel's rotation; can still be slow if the loop calls many ports | First leg plus dwell at the hub plus second leg; the dwell is the variable part |
| Rollover risk | At the origin port only | At origin and again at the hub, if the connecting vessel is full, delayed or skipped |
| Reliability | One vessel's schedule to track | Depends on two or more vessels and on hub congestion; a missed connection can add a week |
| Price | Sometimes higher on thin lanes, where the direct service is the premium product | Often lower or more available; hub handling is normally built into the carrier's rate, but check for any surcharge |
| Port coverage and frequency | Limited to the ports the loop calls | Reaches many more port pairs, often with more weekly departures |
| Handling | Two lifts (load and discharge) | At least four lifts; more chance of handling damage and of a reefer being off power |
Transit time
A transhipped routing is the sum of three parts, and the middle one, the time the box waits at the hub, is the one most likely to stretch. Connections can range from a day or two when services are synchronised to a week or more when the next feeder sails weekly and the box just misses one. Do not assume direct means faster: a direct service that calls eight ports on the way can take longer than a fast mainline to a hub plus a short feeder. Our guide to ocean freight transit times by route gives realistic ranges for the main lanes.
Rollover at the hub
The hub is a second place where your box can be left behind. If the connecting vessel arrives full, is delayed, or the carrier blanks that sailing, containers already at the hub wait for the next one. Shippers often hear late, because the box has left origin and the booking looks fine. Blank sailings on the second leg hit transhipped cargo hard; see blank sailings and void sailings explained for how carriers cancel calls, and rolled cargo prevention for the steps that reduce the risk at origin.
Cost
Transhipped services are often the cheaper or the only option from secondary ports. The hub lift is normally built into the carrier's ocean freight, but contracts vary, so ask whether any transhipment-related charge applies. The real cost is usually time and variability, which shows up as extra inventory rather than a line on the invoice.
What the bill of lading and other documents show
A standard ocean bill of lading names the place of receipt, the port of loading, the port of discharge, the place of delivery and the ocean vessel and voyage. On a transhipped shipment, the vessel named is usually the first ocean vessel, so the ship that actually arrives at the destination often has a different name. Some B/L formats carry a "port of transhipment" or "via" field, and many carriers' terms give them a liberty to tranship whether or not it is shown, so a blank field is no guarantee of a direct sailing.
- Through bill of lading: one contract of carriage covering every leg, issued by the carrier (or an NVOCC) at origin. The carrier remains responsible across the hub, and the document shows the true port of loading. This is what you want for transhipped cargo.
- Separate bills for each leg: if cargo is booked to the hub on one contract and re-booked onward on another, there are two sets of documents, two liability regimes and a gap at the hub. A second B/L issued at the hub may name the hub as the port of loading, which can confuse banks and customs. If documents genuinely need to be replaced mid-voyage, our guide to bill of lading types explains switch bills and their limits.
- Letters of credit: under ICC UCP 600, Article 20, a B/L showing that transhipment will or may take place is acceptable even if the credit prohibits transhipment, provided the goods are shown as shipped in a container, trailer or LASH barge. A credit can still set its own conditions, so check its wording with your bank before you book.
How to spot transshipment in a sailing schedule
Carrier point-to-point schedules and forwarder quotes give the clues, if you know where to look:
- Count the legs. Most carrier schedule tools label a routing "Direct" or show the number of transhipments. More than one leg means at least one change of ship.
- Look for a "via" or T/S column. A routing quoted as "SGSIN" or "LKCMB" in a via field is telling you where the box changes ship.
- Compare vessel names and voyage numbers. If the vessel or voyage changes between legs, the box is transhipped, even when both legs are on the same carrier.
- Check the connecting vessel. A second leg shown as "TBN" (to be nominated) or without a firm departure date is a connection the carrier has not yet committed to.
- Read the connection time. The gap between the hub arrival and the hub departure is your buffer. A tight connection is fast on paper and fragile in practice.
When a transhipped service is the better choice
Transshipment is not a downgrade by default. It is usually the right call when:
- no direct service exists between your two ports, which is common for secondary ports in South Asia, Africa, the Pacific and Latin America;
- the only direct service is a long multi-port loop and a fast mainline plus a short feeder arrives sooner;
- combining services through a hub gives you more weekly departures, so a missed cut-off costs days rather than a week;
- the price difference is large and the cargo is not time-critical.
A direct sailing is usually worth paying for when the cargo is time-critical (a production line or a seasonal launch), high value or fragile (fewer lifts), a reefer with a tight temperature window, dangerous goods with limited acceptance at hubs, or moving in peak season when hubs are congested and rollovers rise.
Transshipment does not change customs origin
A common misconception is that a container routed through Singapore or Colombo becomes Singaporean or Sri Lankan cargo. It does not. Origin follows where the goods were made, not where the ship called. In the United States, 19 CFR 134.1(b) defines country of origin as the country of manufacture, production or growth, and work in another country changes origin only if it is a substantial transformation. Under the EU's Union Customs Code, Article 60, non-preferential origin is the country where goods were wholly obtained or underwent their last substantial, economically justified processing. Lifting a sealed box off one ship and onto another is neither. Our guide to country of origin marking rules covers the marking side of this.
Transshipment can matter for preferential duty, though. Many trade agreements carry a direct transport, non-manipulation or non-alteration rule. The European Commission's guidance is that originating goods may pass through a third country only if they stay under customs supervision there and undergo nothing beyond unloading, reloading or operations to keep them in good condition (newer EU agreements also allow steps such as splitting consignments). If customs doubts it, the importer must prove the goods were not altered or the preference can be refused; a through bill of lading from origin to destination is the usual evidence. See rules of origin and preferential duty for how claims work.
The illegal kind: transshipment to evade duties
"Illegal transshipment" is the trade-enforcement name for something different: shipping goods through a third country and declaring that country as the origin, sometimes after relabelling or minor processing, to avoid tariffs, anti-dumping or countervailing duties, or quotas. In the United States, CBP investigates evasion of anti-dumping and countervailing duties under the Enforce and Protect Act (19 U.S.C. 1517). In one case opened on 20 March 2026 (EAPA case 8282), CBP is investigating an allegation that Chinese golf carts covered by such orders were transshipped via Vietnam, and has imposed interim measures while it decides. False origin declarations can also bring penalties under 19 U.S.C. 1592. A 2025 executive order added a 40 percent penalty rate for goods transshipped to evade the reciprocal tariffs, but those tariffs rested on IEEPA, which the Supreme Court ruled on 20 February 2026 does not authorise tariffs, so check that penalty's current status with your broker. The line is clear: routing a box through a hub is normal and lawful; misstating where the goods were made is not.
What to do next
- Ask your forwarder for the full routing on every ocean quote: the legs, the hub, both service names and the connection time, not just the port pair and total transit days.
- For time-critical, reefer or dangerous goods shipments, compare the direct option even if it costs more, and confirm the hub and connecting carrier accept the cargo.
- Insist on a through bill of lading from origin to destination, and check its wording against any letter of credit before the cargo sails.
- Keep your origin documents tied to the factory, not the route, and keep the transport documents that prove the goods passed through the hub unaltered if you claim preferential duty.
If you are comparing direct and transhipped options on a lane, more than 29,300 logistics companies are searchable by country and service in the CargoLinked directory, so you can find forwarders who work your origin port and the hubs that serve it. You can also post your shipment on the public requests board, which lists freight that shippers have posted for forwarders to quote on directly, and ask each one to state the routing in the quote.
This guide is general information, not legal, customs, tax or financial advice. Port figures are as published by each port or authority for 2025 and may be revised. Rules of origin, trade remedy and tariff measures change; confirm the current position with the relevant customs authority, your bank, or a licensed customs broker before acting.
