International freight guide

Air vs ocean freight: compare more than the rate card

Air is fast but volumetric weight can be high. Ocean is cheaper per unit but adds lead time and inventory financing. Compare total delivered cost and the cost of delay.

7 min readUpdated July 17, 2026

Mode comparison workflow

  1. Calculate actual weight, CBM, air volumetric weight and ocean RT.
  2. Add all surcharges to the air per-kg and ocean per-RT rates.
  3. Estimate inventory capital, stockout and delay cost during transit.
  4. Compare split shipments such as urgent air plus balance by ocean.

The billing units are different

Air normally uses the greater of actual and volumetric weight. Ocean LCL commonly uses the greater revenue-ton value from CBM and metric tons. Low-density cargo can become expensive by air.

  • Air: divisor, minimum weight, security, fuel and terminal charges
  • Ocean: minimum RT, CFS, documentation and destination charges
  • Match pickup, customs and delivery scope in both quotes

Time has a cost

Air can bring sales forward and reduce safety stock. Ocean can tie up product payments and inventory for longer and may require more buffer for schedule variation.

A split shipment can be optimal

Do not test only all-air or all-ocean. Send stockout-prevention units by air and the balance by ocean, then include the cost of two clearances and document sets.

  • Separate urgent sales units from base stock
  • Use margin and density by SKU
  • Include duplicate customs and document cost
  • Align sales plans with two arrival dates

Frequently asked questions

Can air freight be cheaper overall?expand_more

Yes. Small, valuable, dense freight or shipments with high stockout cost may favor air on a total-cost basis.

How should transit time be compared?expand_more

Compare door-to-door time including pickup, booking, customs, release and final delivery, not only airport-to-airport or port-to-port.

Will smaller packaging always reduce air cost?expand_more

It helps when volumetric weight is the billing basis. Once actual weight is greater, volume reduction has limited direct rate impact.

Compare air and ocean billing bases

Enter CBM, weight and rates to calculate air chargeable weight, ocean RT and estimated freight difference.

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