Three modes, and which pair is worth arguing about
Sea, air and express differ in dozens of operational details, and almost every one of them reaches you as a charge rather than as a number of days. The three-way argument is the wrong shape. Two pairwise comparisons cover nearly everything: air against express, because they share a pricing structure and differ in who holds the parcel; and air against sea, because they differ in what the price is even computed on. Naming the pair you are comparing is what keeps the discussion about one variable instead of about five at once.
Duration is the one dimension this page refuses to supply. Crossing times, port dwell and delivery spans are not published as distributions by anyone, and a range copied from a forum post describes a different buyer’s parcel on a different week. What follows is the part that can be compared without inventing a figure, starting from the [chargeable weight](/rig/chargeable-weight/) arithmetic that all three modes share.
- What the charge is computed on, and which of those measurements you can take yourself before paying anything.
- Where the agent stops controlling the parcel, and what evidence survives after that point.
- What each service will refuse to carry, which is a per-service answer rather than a per-mode one.
Read the comparisons below as a list of questions to put to the agent rather than as a verdict. Every cell that would normally hold a day count or a fee holds a question instead, and a question you have asked in writing is worth more than a table somebody else filled in from memory.
Air against express, item by item
Air freight and express look similar on a quote form and behave differently in the middle of the journey. Air freight usually hands your parcel to a consolidator, so a second tracking number appears and the first one stops being the whole truth. Express keeps one label from the warehouse door to your address, which is why its scan history reads as continuous and why its restriction list bites earlier in the process. That second tracking number is also where a parcel can sit without anybody being wrong, because a handover between two networks is not a state that either side has an incentive to report quickly.
| What changes | Air freight | Express | Verify by |
|---|---|---|---|
| Charge basis | Scale or volumetric, whichever is greater | Same rule, other divisor | Asking the divisor |
| Live tracking | Usually two numbers | Usually one number | Asking which stays live |
| Refused contents | Per consolidator | Per integrator | Asking for the list |
| Customs entry | Often a broker | Usually in-network | Not verified |
| Evidence trail | Shipment proof of delivery | Per-parcel scans | Reading the claim form |
The last two rows decide most disputes. The question is not which mode is faster but who holds the record while the parcel sits between two networks, and that answer is written on the paperwork you were given rather than on any comparison page. If nobody can tell you who files the entry, that is itself the answer: nobody has checked.
One more asymmetry is worth naming. With express, the party you complain to and the party that carried the parcel are usually the same organisation. With air freight they frequently are not, so a complaint that starts in the wrong place has to be forwarded before anybody reads it. Ask for the name of the party that will answer a claim before you choose a mode, and write the answer down where you will find it again.
Air against sea, and the part sea changes that is not duration
The honest difference between sea freight vs air freight for a Taobao order is not fast against slow. It is a different unit of decision. Sea services are built around departures at intervals, so a parcel handed over just after one departure waits for the next. That makes the useful question "when is the next departure" instead of "how long does it take", and a departure date is a fact somebody can look up for you today.
The second difference is what the parcel tolerates on the way. More time inside a container means more humidity, more stacking pressure and more handling by people who never see your photo set. None of that changes the item, and all of it changes what belongs in the box, which is a packing question rather than a transit one. A carton that survives a flight in a hold is not automatically a carton that survives weeks of stacking, and the difference is a decision you control before handing anything over.
- Basis of the charge: the divisor applied to volume changes, while the formula stays the greater of scale and volumetric weight.
- Dimensional limits: the longest side and the girth each service accepts change, and your carton does not unless you repack it.
- What you can still change: very little once a parcel joins a consolidation, because the address rule closes when freight is paid.
- Evidence of the journey: how many scans exist and who owns each one changes, while your own log stays yours either way, and a log that records the mode is the only way to compare two of them after the fact.
For sea, ask the agent for the next scheduled departure rather than a duration. A departure date is something a person can look up; a duration is a summary of other people’s parcels and usually arrives as a range.
Scoring the trade-offs you can actually weigh
A scorecard only works when the weights are yours. Give each property a weight from 1 to 3 based on what would genuinely annoy you, then mark each mode’s answer as known, unknown or ask. Treat unknown as ask and never as probably fine, because the unknown cells are exactly the ones that produce a surprise on the invoice. Weights of 1 to 3 are enough; a finer scale pretends to a precision that the inputs do not have.
- List the properties that matter: charge basis, restriction list, who holds the record, and what can still be changed afterwards.
- Weight each one from 1 to 3; a bulky carton and a battery do not deserve the same weight.
- Fill every cell with known, unknown or ask, and refuse to invent a fourth value.
- Re-score after one shipment arrives, using what the invoice actually said rather than what the quote implied.
The exercise takes about ten minutes and it changes the decision more often than a price comparison does. Two buyers with the same three quotes can reach opposite conclusions once the weights are written down, and neither of them is wrong, because the weights describe different parcels and different tolerances. A scorecard also gives you something to check after the fact: one written before shipping can be compared against an invoice, while a preference remembered afterwards cannot.
Two buyers looking at the same three modes can reach opposite conclusions without either being wrong. The scorecard records your priorities, and it is not a ranking of services.
The conclusion, and the case against it
Choose on the charge basis and the restriction list first, then treat the speed question as a separate purchase. When two services compute chargeable weight differently, that difference can exceed every other line on the invoice. A carton of 40 by 30 by 25 centimetres measures 30,000 cubic centimetres, which charges as 6 kilograms at a divisor of 5,000 and as 5 kilograms at a divisor of 6,000. One box, one kilogram apart, with nothing about its contents changed.
The counter-case is real and worth stating plainly. If the item is cheap, heavy and unhurried, none of this matters: the mode choice becomes a rounding decision and the best answer is whichever option avoids a repack. The argument fails at the other end, for a light, expensive, restricted item, where the restriction list and the evidence trail decide whether you see the parcel at all. For that parcel the useful comparison is between the restriction list and the evidence trail, and the day count is the least of it. That is why the whole comparison sits inside [the transit material](/table/transit/) rather than inside a delivery estimate.
This page gives no crossing, transit or delivery ranges for any mode. Where a duration would normally sit, the entry is "not verified", because the only duration you can defend is the median of your own rows at [the freight stage](/steps/pay-freight/).
Worked example: a carton of 40 by 30 by 25 centimetres measures 30,000 cubic centimetres. Divided by 5,000 it charges as 6 kilograms; divided by 6,000 it charges as 5 kilograms. The same box moves 1 kilogram of chargeable weight, a 20 per cent swing, purely from the divisor a service applies. (Worked example)
This note explains the mechanics; the list is where the items are.