A parts maker in Hsinchu ships to the US twice a month: an urgent 80 kg order by express, an 800 kg replenishment by air freight, and at quarter-end a consolidated ocean container of slow-moving stock. They use all three, because every batch differs in how urgent and how heavy it is. Asking “which is better, sea or air?” is like asking “which is better, the high-speed rail or a truck?” — first look at what you are carrying and how fast it must arrive.
The essential differences
| FedEx / DHL express | Air freight | Ocean (LCL / FCL) | |
|---|---|---|---|
| Door-to-door time | 2–5 days | 5–10 days | 18–35 days |
| Best weight range | 1–300 kg | 100–1,000 kg | 300 kg and up / by cubic meter |
| Pricing | greater of actual and dimensional weight, per kg | per kg (with minimums) | LCL by CBM, FCL by container |
| Customs | courier simplified or formal entry | formal entry | formal entry |
| Hidden costs | dimensional weight, remote-area surcharges | airport pickup, inland leg extra | port charges, devanning, sailing schedules |
Three common crossover points (actual numbers move with fuel and season — treat as orders of magnitude):
- Under 45 kg: express nearly always wins, avoiding the fixed costs of airport pickup and brokerage
- 100–300 kg: express and air freight start to cross; on a commercial contract rate, express often stays competitive up to 300 kg — exactly the sweet spot of SKYCARGO’s group FedEx contract rates
- 500 kg or 2 CBM and up: ocean LCL starts to crush on unit cost; at around 15 CBM ask for a full container — FCL is often cheaper than a large LCL and your goods do not share a box with anyone else’s
Three business variables beyond the matrix
1. Capital in transit. Part of what ocean freight saves is eaten back by 30 days of interest on goods value at sea. For high-value products (a $100,000 batch of parts), the extra air-freight cost can be lower than the capital cost plus stock-out risk.
2. Delivery-window penalties. US retail POs often carry delivery windows — late means fines or refusal. In peak season, sailing schedules wobble; ship the core volume by ocean and an insurance volume by air rather than betting everything on one vessel.
3. Inspection risk. When FDA / USDA-regulated cargo is sampled, an ocean container waiting at the port costs far more in storage than air freight — and cold-chain cargo burns money daily. For first shipments and new items, fly a small quantity first; move to ocean once clearance runs smoothly.
Mixing is the norm, not a compromise
A mature shipping structure usually looks like this:
- Urgent orders, samples, emergency replenishment: FedEx contract-rate direct, 2–5 days to door
- Routine replenishment: air freight or heavy express, chosen by that month’s volume
- Seasonal volume: full ocean containers, booked six to eight weeks ahead
- A US-side buffer: safety stock in the Los Angeles or Oregon warehouse, delivered domestically by FedEx — moving the “urgency” from across the Pacific to inside the US
That last line is the one most Taiwanese makers have never used and the one that changes the most: instead of paying international express on every urgent order, let ocean freight move inventory into a US warehouse cheaply, and urgent orders ship from the warehouse overnight.
Run the numbers on your cargo
SKYCARGO INC combines group FedEx commercial contract rates, air and ocean freight, and warehouses in Los Angeles, Oregon and Taoyuan; we can act as Importer of Record for formal entry and FDA / USDA inspection. Send us your monthly volume, unit value and delivery requirements and we will reply within one working day with a three-option comparison built on your own cargo.
Transit times and crossover points are market norms; actual rates move with fuel, season and lane. Quotes govern. For reference only.
