Every shipment from China starts with one fundamental question: air or sea? The answer depends on three factors — how fast it needs to arrive, how much it weighs, and what type of cargo it is. This comparison breaks down the real numbers, not just generalities, so you can make the decision with confidence. As a freight forwarder handling dangerous goods, project cargo, and general merchandise from China's major ports, we see the trade-offs every day.
Cost Comparison: Air vs Sea Freight from China
Sea freight costs are quoted per container (TEU/FEU) or per cubic meter for LCL. Air freight is quoted per kilogram (chargeable weight, which is the greater of actual weight or volumetric weight at a 1:6 ratio per IATA rules). The table below shows typical all-in rates from major Chinese ports to Europe and North America as of mid-2026.
| Cost Factor | Air Freight | Sea Freight (FCL) | Sea Freight (LCL) |
|---|---|---|---|
| Per kg rate | $3.00 - $8.00/kg | $0.15 - $0.40/kg | $0.50 - $2.00/kg |
| Per m³ rate | $500 - $1,200/m³ | $50 - $150/m³ | $150 - $400/m³ |
| 20ft container (approx.) | N/A (unpractical) | $1,500 - $4,500 | N/A |
| 40ft container (approx.) | N/A | $2,500 - $7,000 | N/A |
| 100 kg shipment | $300 - $800 | N/A (LCL alternative) | $80 - $250 |
| 1,000 kg shipment | $3,000 - $8,000 | $500 - $1,500 (LCL) | $500 - $2,000 |
| Fuel surcharge | $0.30 - $0.80/kg | Included in base rate | Included |
| Security surcharge | $0.10 - $0.15/kg | Minimal ($10-25) | Minimal |
| Terminal handling | $0.05 - $0.10/kg | $200 - $400 per container | $20 - $50/m³ |
Source: Composite rates from major carriers (MSK, MSC, HPL, CMA CGM) and air cargo indices (TAC Index, June 2026). Actual rates vary by lane, season, and cargo specifics.
Transit Time Breakdown
| Transit Stage | Air Freight | Sea Freight |
|---|---|---|
| Pickup to airport/port | 0.5-1 day | 1-2 days |
| Export customs clearance | 0.5-1 day | 1-2 days |
| Main transit (China to Europe) | 1-2 days | 25-35 days |
| Main transit (China to US West Coast) | 1 day | 14-18 days |
| Main transit (China to US East Coast) | 1-2 days | 28-35 days |
| Import clearance + delivery | 1-2 days | 2-5 days |
| Total door-to-door (Europe) | 3-6 days | 29-44 days |
| Total door-to-door (US East) | 3-7 days | 32-44 days |
Cargo Suitability Guide
| Cargo Type | Recommended Mode | Reason |
|---|---|---|
| Electronics / semiconductors | Air freight | High value-to-weight ratio; time-sensitive supply chains |
| Fashion / seasonal goods | Air freight | Short selling window; markdown risk exceeds freight cost |
| Automotive parts (routine) | Sea freight | Medium value; predictable demand; sea consolidations work well |
| Heavy machinery | Sea freight (breakbulk/OOG) | Too heavy/dimensional for air; flat rack or platform container |
| Pharmaceuticals (non-cold-chain) | Air freight | High value; regulatory expiry dates |
| Furniture / bulky consumer goods | Sea freight | Low value-to-volume ratio; sea FCL most economical |
| Lithium batteries (UN3480) | Sea freight preferred | Air heavily restricted; sea accepts under IMDG Code with proper DG packaging |
| Perishable food | Air freight | Shelf-life constraints; temperature-controlled air containers available |
Dangerous Goods (DG) Capability Comparison
DG handling is where the air vs sea decision becomes especially consequential. Air freight under IATA DGR is significantly more restrictive than sea freight under the IMDG Code.
| DG Aspect | Air Freight (IATA DGR) | Sea Freight (IMDG Code) |
|---|---|---|
| DG classes accepted | Limited: most airlines accept classes 3, 6, 8, 9 only. Classes 1, 2.3, 5.1, 5.2 restricted | Broad: classes 2-9 routinely accepted. Class 1 (explosives) on specialized carriers |
| Lithium batteries | UN3480 (lithium-ion alone) forbidden on passenger aircraft; restricted on cargo-only with state-of-charge limit ≤30% | Accepted under SP188, SP230, and SP376 depending on configuration. Requires UN38.3 test summary and DG Packaging Certificate |
| DG documentation | Shipper's Declaration for Dangerous Goods (DGD); IATA DGR training required for signatory | DG Declaration (DGD); Maritime DG Declaration; DG Packaging Certificate (危包证); MSDS |
| Packaging requirements | UN-specification packaging; more restrictive quantity limits per package | UN-specification packaging; higher quantity limits; more flexibility for mixed loads |
CO2 Emissions Comparison
Sustainability reporting is increasingly part of supply chain RFPs. Air freight emits approximately 470-550g CO2 per ton-km, versus 10-15g CO2 per ton-km for sea freight according to IMO and IATA data. For a 1,000 kg shipment from Shanghai to Hamburg:
- Air freight: ~5,400 kg CO2
- Sea freight: ~150 kg CO2
Sea freight produces roughly 35-40 times less CO2 per ton-km. If sustainability metrics matter for your supply chain, this gap is hard to ignore. Some shippers use a "sea + air top-up" strategy to balance emissions and speed.
Decision Flowchart
Real Scenario: Electronics from Qingdao to Germany
A customer shipping 800 kg of industrial control modules from Qingdao to Hamburg had the following comparison:
| Air Freight | Sea Freight (LCL) | |
|---|---|---|
| Transit time | 4 days | 32 days |
| Freight cost | $3,200 (at $4.00/kg) | $480 (at 3.2 m³ / $150/m³) |
| All-in cost (incl. clearance, delivery) | ~$3,800 | ~$980 |
| Inventory carrying cost (28 extra days at sea) | N/A | ~$420 (5% annual cost of goods) |
| True cost difference | $3,800 | $1,400 |
The sea freight option saved ~63% even after accounting for the extra 28 days of inventory carrying cost. For this customer, the production schedule had sufficient buffer, making sea freight the clear choice.
Frequently Asked Questions
Can I combine air and sea freight for a single shipment?
Yes. Many shippers use a mixed-mode strategy: sea freight for the bulk of inventory and air freight for urgent restocking. This is often called sea-air or multimodal split shipping. You ship the majority by sea to a hub such as Dubai or Singapore, then fly time-sensitive units to the final destination. A freight forwarder manages both legs under a single coordination plan. This approach is particularly effective for consumer electronics and fashion, where initial stock goes by sea and replenishment of fast-selling SKUs goes by air.
Is cargo insurance different for air vs sea freight?
The insurance mechanism is similar — both use marine cargo insurance policies — but the premium rates differ. Air freight typically carries a lower insurance rate (around 0.1-0.2% of cargo value) compared to sea freight (0.15-0.3%) because transit time is shorter and handling risk per leg is lower. However, the total insured value is often higher for air freight because higher-value goods tend to be shipped by air. Some forwarders offer all-risk coverage that works across both modes.
How should I plan for peak season across air and sea freight?
Peak season (August through November) affects both modes but differently. Sea freight sees space shortages 4-6 weeks before Chinese New Year and during Q3 as retailers stock for year-end holidays. You should book sea freight 3-4 weeks ahead during peak. Air freight tightens during Q4 e-commerce demand (Singles' Day, Black Friday, Christmas) — book 7-10 days ahead. For time-sensitive cargo during peak, consider China-Europe rail (15-18 days) as a cost-effective middle ground that avoids both air peak surcharges and sea transit delays.