Sea Freight: The Cost-Effective Default, If You Plan Around the Real Risk
Sea freight is usually the lowest-cost way to move international cargo at scale, but the planning risk is not just the ocean rate. Port congestion, customs readiness and inland capacity can decide whether the cargo arrives when expected.
FCL or LCL: the short version
FCL gives you exclusive use of a container. LCL shares a container with other shippers and normally charges on volume or weight. LCL is common for smaller consignments; FCL becomes more attractive as cargo volume grows, with the crossover often around the low-to-mid teens in cubic metres depending on route, rates, density and destination charges.FCL also has fewer consolidation and deconsolidation handling points, which can matter for fragile or high-value cargo.
The real variable: port congestion
Quoted transit times assume a workable schedule. Vessel delays, berth congestion, labour disruption, weather, customs holds or network changes can add days. Static transit-time tables do not capture those changes.
Carrgo's Port Congestion Tracker is designed to give importers a current view of conditions at key UK and Ireland ports before committing to a delivery plan.
Route conditions matter
China-to-UK transit depends on the origin port, direct or transhipment service, carrier rotation and UK discharge port. European sea and short-sea services are shorter but still require customs and terminal planning. USA-to-UK movements vary by coast and inland collection point, so treat generic transit times as planning ranges rather than guarantees.
For route-specific guidance see China to UK and USA to UK.
Customs can stop cargo after it physically arrives
A container at the terminal is not automatically free to leave. Import declarations, supporting documents, product controls and any duties or taxes must be dealt with before release. Preparing the customs file in advance reduces the chance of avoidable storage charges.
How Carrgo manages sea freight
Carrgo arranges FCL, LCL and selected project cargo movements with customs clearance and final delivery where required. We combine shipment tracking with current port intelligence so planning is based on more than a static sailing estimate.
Need a freight quote?
Tell us your origin, destination, goods, approximate weight or volume and preferred timing. We can advise the best mode and quote the full journey.
Get a freight quoteFrequently Asked Questions
How long does sea freight take?
It depends on the origin, destination, service, transhipment plan, customs and current port conditions. Long-haul sea freight is generally measured in weeks.
What causes sea freight delays?
Common causes include port congestion, missed vessel connections, weather, customs issues, equipment shortages and capacity disruption.
Should I choose FCL or LCL?
LCL is usually appropriate for smaller volumes; FCL becomes more attractive as volume grows or when reduced handling and exclusive container use matter.
Does Carrgo handle customs clearance for sea freight?
Yes. UK customs clearance can be coordinated as part of the sea freight movement.
How can I check port congestion before booking?
Use Carrgo's Port Congestion Tracker and confirm the latest sailing and terminal position when you request a live quote.