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Sea or air? The freight decision, decided properly.
The gap between sea and air freight is big enough to change whether a product works commercially. Which makes it strange how often the decision is made by panic instead of maths.
skeelx — 24 aug 2026 · 4 min read
The structural trade is simple: sea freight moves goods from China to Australia in weeks door-to-door and costs are driven by volume; air moves the same goods in days and costs a large multiple, driven by weight. Everything interesting lives in the details — and in the timing mistakes that turn a sea-freight budget into an air-freight invoice.
Volumetric weight, the quiet decider
Air freight charges on whichever is greater: actual weight or volumetric weight — the space your cargo occupies converted to a billable figure. Light, bulky products (think housings, foam-packed devices, anything boxy) get punished in the air and travel almost free by comparison on the water. Dense, small, high-value products are air's natural passengers. Before comparing quotes, know which kind of product you have; it often settles the argument alone.
When air genuinely earns its multiple
Launch batches, where weeks of shelf time are worth more than the freight difference. Replenishment gaps, where a stockout costs more margin than the flight. Samples, golden samples and first articles — always. High value-density products where freight is a rounding error. What air should never be: the routine plan for a margin-sensitive product, or the emergency tax you pay because production slipped and nobody saw it early — schedule truth, not freight mode, is the real fix there.
The hybrid launches actually use
The pattern that works: air a small opening tranche to hit the launch date, sea the volume behind it, and let the two arrive in sequence. You pay the multiple only on the units that need the speed. It requires the production schedule and the freight booking to be planned together — which is precisely why freight belongs inside production management, not bolted on after.
Deciding it properly
Run both modes through the landed-cost model — including the GST that applies to the freight itself — against your real launch dates and stock cover. Then re-run it when anything material changes. The decision isn't sea versus air once; it's a per-shipment call made with current numbers, next to the incoterm that determines who's booking it at all.