The Fundamental Trade-Off
Every importer faces this decision: ship by air and get products in days, or ship by sea and wait weeks but pay a fraction of the cost. The right choice depends on your product, margins, and business situation.
Cost Comparison
As a general rule of thumb:
- Sea freight: Typically costs between $1–5 per kg for a full container, depending on the route
- Air freight: Typically costs between $4–12 per kg, depending on the route and urgency
For lightweight, high-value products (electronics, fashion accessories), air freight may add only a small percentage to your landed cost. For heavy, bulky, low-margin products (furniture, building materials), sea freight is usually the only viable option.
When Sea Freight Makes Sense
- Large, heavy shipments — containers offer excellent per-unit economics at scale
- Stable demand — you can plan inventory 4–8 weeks ahead
- Low-margin products — where freight cost as a percentage of product value matters significantly
- Regular ordering schedule — consistent reorders make transit time manageable
A standard 20ft container (TEU) holds roughly 25–28 cubic metres. If you can fill most of a container, you'll get far better per-unit rates than LCL (Less than Container Load) shipping.
When Air Freight Makes Sense
- Urgent restocks — you're about to run out of a best-seller
- High-value, lightweight products — where freight is a small percentage of product cost
- New product launches — getting initial stock quickly to test market demand
- Seasonal products — when missing the window means missing the season
- Small orders — when volumes don't justify a sea container
The Hybrid Approach
Many experienced importers use a combination:
- Bulk shipments by sea — your main inventory replenishment on a regular cycle
- Top-up by air — smaller quantities of fast-moving SKUs to prevent stockouts
This approach lets you maintain competitive landed costs on most of your inventory while keeping your best sellers in stock.
Calculating the Impact
To decide, calculate the landed cost per unit for both methods:
Sea freight example (1,000 units of a product weighing 0.5kg each):
- Product cost: $5.00/unit
- Sea freight allocated: $0.40/unit
- Total freight impact: 8% of product cost
- Transit time: 30–45 days
Air freight example (same product):
- Product cost: $5.00/unit
- Air freight allocated: $3.50/unit
- Total freight impact: 70% of product cost
- Transit time: 5–7 days
In this case, sea freight saves $3.10 per unit — a significant difference that compounds across your order volume.
Key Considerations
- Cash flow — sea freight ties up your capital for longer (goods in transit + payment terms)
- Minimum order quantities — sea containers require larger orders to be cost-effective
- Seasonality — freight rates fluctuate; peak season surcharges can double sea freight costs
- Product shelf life — perishable or trend-sensitive goods may need air freight
The bottom line: run the numbers for your specific products. The difference in landed cost between air and sea often makes the decision obvious.
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