Air Freight vs Sea Freight
Enter your shipment details to get a side-by-side cost, speed, and emissions estimate. Rates are indicative — get exact quotes from your forwarder.
Key Differences at a Glance
Eight dimensions that determine which mode is right for your shipment.
Freight Cost
$3–9 per chargeable kg
$50–130 per CBM (LCL) or $1,200–3,500 per FCL
Transit Time
2–6 days door-to-door
14–35 days port-to-port
CO₂ Emissions
~50–80× higher per kg than sea
Lowest carbon footprint per tonne-km
Schedule Reliability
High — daily departures, short windows
Moderate — weekly sailings, port congestion risk
Cargo Capacity
Limited — weight & volume restrictions per flight
Essentially unlimited — containers up to 28 tonnes
Suitable Cargo
High-value, perishable, urgent, lightweight
Heavy, bulky, non-urgent, hazardous (with permit)
Insurance Cost
Lower rate — shorter exposure, less handling
Higher rate — longer transit, more handling events
Customs Complexity
Simplified AWB process
Bill of lading, more documentation required
Green dot indicates the stronger option for that dimension.
When to Use Each Mode
Use Air Freight When
- Time is critical — stock-outs, production deadlines, or seasonal demand spikes that can't wait 4–6 weeks
- Cargo value is high enough that faster transit reduces carrying cost, insurance, and supply chain risk
- Goods are perishable — fresh produce, pharma, live animals — where sea transit would spoil the cargo
- Shipment is small and lightweight — under 500 kg and 3 CBM, where sea LCL minimum charges make it uneconomical
Use Sea Freight When
- Cargo is heavy or bulky — machinery, raw materials, furniture — where air freight cost would be prohibitive
- Lead times are long enough — you have 6–10 weeks from order to delivery and can absorb transit time
- You have enough volume for FCL — above 15 CBM, a full container is almost always cheaper than air per unit
- Cargo is dangerous goods that cannot fly — certain chemicals, batteries, gases, flammables
6 Mistakes Shippers Make Choosing a Mode
Most wrong mode choices come down to the same calculation errors and planning gaps.
Comparing air and sea on gross weight alone
Air freight is charged on chargeable weight — the higher of actual weight or volumetric weight (CBM × 167). A lightweight but bulky shipment (think furniture, foam, auto parts) can have a chargeable weight 3× its actual weight, making air far more expensive than a raw weight comparison suggests.
Ignoring the full landed cost difference
The freight rate is only part of the cost. Sea freight adds inventory carrying cost for 4–6 extra weeks of stock, plus potential stockout cost if demand spikes. Air freight adds higher insurance premiums. Run the full landed cost comparison, not just the freight invoice.
Defaulting to air because of late ordering
Using air freight to cover late purchase orders is the most expensive operational habit in supply chains. Each air shipment costs 4–8× more than sea. The root fix is improving lead time management — not normalizing emergency freight as a cost of doing business.
Using sea LCL for small shipments that should fly
Sea LCL has minimum charges, handling fees, deconsolidation fees, and longer transit times. For shipments under 1 CBM and 150 kg, the total sea door-to-door cost often exceeds air courier, with 3× longer delivery time. Always compare LCL all-in cost against air express for small parcels.
Ignoring the CO₂ cost in sustainability-conscious supply chains
Air freight produces roughly 50–80× more CO₂ per tonne-km than sea. For companies with Scope 3 emissions targets, routine use of air freight can blow an entire division's carbon budget. Mode choice is increasingly a sustainability decision, not just a cost decision.
Not accounting for peak season surcharges
Air freight rates spike 40–150% during peak periods (pre-Chinese New Year, Q4 holiday season). Sea freight has peak season surcharges (PSS) too, but they are smaller in absolute terms. If your shipment timing is flexible, shifting by 2–4 weeks can save significant freight cost on either mode.