Why the Air Freight Rate You Received This Morning May Already Be Obsolete
There is a particular frustration familiar to any US logistics manager who sources from Vietnam: you receive an air freight quote, budget it into your landed cost model, and then—days or even hours later—discover the rate has shifted materially. The quote, technically valid, has become functionally useless.
This is not a vendor reliability problem. It is a structural feature of how air freight pricing actually works in the Vietnam-to-US corridor, and it is one that most importers do not fully understand until it has already cost them money. The purpose of this article is to change that.
What a Quote Actually Represents
When a freight forwarder provides an air freight rate, they are typically reflecting a combination of carrier-filed rates, current fuel surcharge levels, terminal handling charges, and any spot-market adjustments they have negotiated for a specific window of capacity. Each of those components can—and does—move independently.
Carrier-filed rates from Vietnam are not fixed tariffs. They are subject to regular revision by airlines based on route profitability, competitive pressure, and network capacity allocation decisions made at the global level. A rate that is accurate on a Tuesday may reflect an airline's internal pricing before a Thursday capacity review that reallocates belly cargo space away from the Vietnam route.
Fuel surcharges, which can represent a significant portion of the all-in rate, are recalculated by most carriers on a weekly or biweekly basis, tied to jet fuel index benchmarks. A quote that does not specify the fuel surcharge component—and its effective date—is a quote with an invisible expiration.
The Capacity Auction Dynamic
Vietnam's air freight market, particularly out of Ho Chi Minh City's Tan Son Nhat International Airport, operates under chronic capacity constraints that have intensified as manufacturing investment in the country has accelerated. When demand exceeds available belly and freighter capacity—which happens with predictable frequency—carriers effectively conduct informal capacity auctions.
In practice, this means that the rate a forwarder quotes you reflects what they can currently secure. If a larger shipper with an established carrier relationship needs space for a priority shipment, that capacity may be reallocated, and your forwarder must either pay a premium for alternative space or push your cargo to a later flight. Neither outcome matches the original quote.
This dynamic is particularly pronounced during peak manufacturing periods in Vietnam—typically the run-up to Lunar New Year and the Q3-to-Q4 export surge driven by US retail replenishment cycles. During these windows, the spread between a quoted rate and the actual cost of securing confirmed space can be substantial.
Seasonal Demand and Its Multiplier Effect
Seasonal demand patterns are well understood in theory but consistently underestimated in practice. The challenge is not identifying that Q4 rates will be higher—every experienced importer knows this. The challenge is quantifying how much higher, and for how long.
Historical data from the Vietnam-to-US corridor shows that peak-season rate premiums can range from 30 to over 100 percent above baseline, depending on the specific routing, the carrier, and the year's broader global freight environment. What makes this particularly difficult to plan around is that the inflection point—the moment when rates begin rising sharply—varies year to year based on factors that are not fully visible until they are already moving markets.
These include US retailer inventory positions (a lean inventory environment accelerates the import surge), Vietnamese factory production timelines, and the availability of freighter capacity that may be diverted from other global routes.
Currency as a Compounding Variable
For US importers, air freight is typically quoted and invoiced in US dollars, which might suggest that currency fluctuation is not a relevant variable. This is partially correct and importantly incomplete.
The costs that Vietnamese freight forwarders and carriers incur domestically—terminal fees, trucking, labor, local taxes—are denominated in Vietnamese dong. When the dong weakens against the dollar, those local costs become cheaper in dollar terms, which can create modest downward pressure on quotes. When the dong strengthens, the opposite occurs.
More significantly, the broader currency environment affects the competitiveness of Vietnamese exports, which in turn drives shipment volumes, which drives capacity utilization, which drives rates. Currency dynamics are not a direct input to your freight quote, but they are an upstream driver of the market conditions that produce that quote.
A Framework for Defensive Rate Management
Given these structural realities, the question is not how to find a stable rate—stability is not available in this market—but how to negotiate and plan defensively within a volatile environment.
Separate the components. Request quotes that break out the base rate, fuel surcharge, terminal handling charges, and any security or documentation fees individually. This allows you to track which components are moving and by how much, rather than reacting to an opaque all-in number.
Establish rate validity windows explicitly. Before accepting any quote, confirm in writing the date through which it is valid and the specific conditions under which it can be revised. A quote without an explicit validity date is a quote with an implicit validity of approximately now.
Build a rate history database. Even a simple spreadsheet tracking quoted rates by lane, carrier, and date—over 12 to 18 months—gives you a basis for identifying seasonal patterns and evaluating whether a current quote is genuinely competitive or simply what the market will bear at a moment of high demand.
Negotiate volume commitments strategically. Carriers and forwarders will offer more favorable rate structures to shippers who can commit to consistent volumes. If your import cadence is predictable enough, a tiered volume agreement can reduce your exposure to spot-market volatility without eliminating flexibility entirely.
Diversify your carrier relationships. Dependence on a single carrier for Vietnam-to-US air freight creates concentration risk that manifests most acutely when that carrier has a capacity constraint or a service disruption. Maintaining active relationships with at least two carriers on the lane provides both competitive leverage and operational backup.
Index your budgets to a range, not a point. Rather than building your annual landed cost model around a single rate assumption, model a base case, a stress case, and a favorable case—using historical volatility data to set the parameters. This forces a more honest conversation internally about margin exposure and creates room to act decisively when rates move in your favor.
The Strategic Implication
Air freight rate volatility from Vietnam is not a problem that can be solved. It is a condition that must be managed. The importers who navigate it most effectively are not those who find the best single quote—they are those who build systems for tracking, negotiating, and responding to rate movements across the full cycle of a year's worth of shipments.
At FPT MultiAir, our approach to rate management is built on transparency about what is driving costs at any given moment, and on giving our clients the market context they need to make decisions that hold up not just today but across the volatility of the months ahead.
