QUICK ANSWER Air freight moves a shipment from Asia to the US door in roughly 5 to 8 days at several times the ocean price; ocean freight takes 30 to 45 days door to door at a fraction of the cost. The working break-even: below about 100 kg, air usually wins outright; above 2 CBM or 500 kg, ocean wins unless product value or a deadline overrides; between the two, quote both. The right answer changes with the shipment and the season, not with the company's habit.
The air vs ocean freight question gets answered too early and too permanently: a company "is an ocean shipper" and stays one through three stockouts a year. The comparison below covers what the gap costs, where the break-even sits, and the parts of the decision, damage, tied-up cash, carbon, that rarely make it into the quote.
One trade-off, and the things that never change
The core exchange is speed for money: air freight buys weeks, ocean freight saves multiples. Around that trade, more stays constant than importers expect. Customs is the same entry with the same duty, Section 301 included; your documentation set is nearly identical, with an air waybill standing in for the bill of lading; and your responsibilities as importer do not shrink because the cargo flew. One genuine difference: the ocean-only ISF filing does not exist on air, where carrier-side manifest systems take its place.
The real size of the price gap
On a like-for-like shipment, air commonly runs four to six times the ocean price, and more when the cargo is bulky, because air bills chargeable weight while ocean bills space. What decides whether that multiple is affordable is value density: freight cost matters as a percentage of product value, so a $60,000 pallet of electronics shrugs off an air bill that would erase the margin on a $6,000 pallet of homeware. Current per-kilogram levels and what moves them live in the air freight cost guide.
The break-even, weight by weight
Where each mode wins, by shipment size
| Shipment size | Default mode | Unless |
|---|---|---|
| Under ~100 kg | Air or courier | Almost never worth LCL minimums and weeks |
| 100 to 500 kg | Gray zone, quote both | Value density and deadline decide |
| 500 kg to ~2 CBM | LCL ocean | A launch date or stockout overrides |
| Over 2 CBM | Ocean, FCL as volume grows | Product value per kg is exceptional |
TAKEAWAY Run the break-even per SKU and per shipment, not per company. The same importer can be right shipping ocean in March and right shipping the same product by air in October, and the check costs one quote.
A week against a month, door to door
The flight is hours; the shipment is not. Real air freight from Asia runs 5 to 8 days door to door once consolidation, terminal handling, and clearance are counted, detailed in our air transit guide. Ocean is slower twice over: 14 to 17 days port to port on the fastest China-to-West-Coast strings per our ocean transit tables, but 30 to 45 door to door once drayage, clearance, and inland legs stack on. The honest comparison is 5-8 against 30-45, which is a month of difference, and a month is exactly what it sounds like: a season's worth of selling time on some products, nothing at all on others.
What air buys beyond speed
Three quieter advantages ride with the speed. Damage and theft exposure drop, because the cargo is handled less and spends days rather than weeks in the system. Working capital comes back: four extra weeks of inventory on the water is four weeks of cash you financed, which is real money at scale and painfully real before a peak season. And schedule reliability is tighter, flights slip by hours where sailings slip by days. The bill for all of it, beyond the rate, is carbon: per ton-kilometer, air emits an order of magnitude more CO2 than ocean, and buyers with reporting requirements increasingly ask about it.
When air is the strategic call
Some air shipments are not rate decisions at all. A product launch with a fixed date. A stockout mid-season, where the lost margin on empty shelves dwarfs the freight difference. Short-lifecycle goods, fashion drops, seasonal electronics, where four weeks of transit is four weeks of shelf life. And high-value, low-weight cargo, where the freight bill is noise against the invoice value either way. In these cases the question is not "is air worth it" but "what does slow cost", and slow usually loses.
How Platton prices the mode call
Importers get the most out of the mode decision when both options live with one operator and the comparison is routine instead of a project.
One file, either mode
The same reviewed documents, supplier data, and customs setup feed an air freight booking or an ocean one, so choosing the mode never means rebuilding the shipment.
The break-even run per SKU
For repeat products we hold the chargeable weight, the ocean equivalent, and the landed difference on file, so "should this go air this time" is a lookup, not an analysis.
Mode switches without re-onboarding
When a season or a stockout flips the answer, the switch is a booking change. The restock playbook, what to fly and what to leave on the water, is its own guide.
Get the same shipment quoted both ways
Common Questions About Air vs Ocean
Which is better, air or sea freight?
Neither, categorically: air is better at time, ocean at cost, and the winner depends on the shipment's weight, value, and deadline. The break-even table above is the practical answer: under 100 kg air, over 2 CBM ocean, quote both in between, and let value density settle the gray zone.
Which is faster door to door, and by how much?
Air, by roughly a month on Asia-to-US lanes: 5 to 8 days door to door against 30 to 45 for ocean once every leg is counted. The gap narrows on premium ocean services and stretches in peak season, but "week versus month-plus" is the planning reality.
What are the disadvantages of air freight?
Price first: several times ocean on the same cargo, with bulky freight punished further by chargeable weight. Capacity limits and size restrictions follow, oversized cargo simply does not fly economically. And carbon: an order of magnitude or more per ton-kilometer, which matters under any emissions reporting.
How much cheaper is ocean freight than air?
Commonly a fourth to a sixth of the air price on the same shipment, and the gap widens as volume grows, because ocean scales into containers while air scales into chargeable kilograms. On very small shipments the gap shrinks or inverts, since LCL minimum charges and fees eat the theoretical savings.
Is customs clearance faster for air freight?
The clearance itself is the same process with the same duty; nothing about flying changes your obligations, though the ocean-only Harbor Maintenance Fee does drop off an air entry. Air feels faster because filings happen while the cargo is airborne, hours matter, and there is no ocean-style ISF. The genuine difference is that air cargo reaches the clearance stage weeks earlier, not that CBP treats it differently.
How much higher is air freight's carbon footprint?
Per ton-kilometer, air cargo emits an order of magnitude more CO2 than container shipping, commonly cited at tens of times higher depending on aircraft and routing. For importers with emissions reporting, mode choice is one of the largest single levers in the freight footprint, which argues for flying the exceptions, not the baseline.
Related Air Freight Guides
Chargeable weight explained: the billing math that punishes bulky cargo in the air.
Air freight cost: what drives the price: the per-kilogram levels behind the multiple.
Ocean to air restock: the mid-season switch, done deliberately.
Ocean transit times, China to US: the other side of the month you are buying back.
