Sea freight vs air freight: which suits your move?
How each is charged, where the time goes, what can't fly, and how customs treats a move split between the two.
Sea freight suits the bulk of a home and air freight the few cartons you need first. Sea suits furniture and volume, in a container of your own or a shared one. Air arrives sooner but is charged on chargeable weight, so bulky, light goods cost more than their weight suggests.
You can also use both, with a small air shipment first and the rest by sea. This guide explains how each mode is charged, where the time goes from door to door, and what can't fly.
It also shows how customs treats a move split between air and sea, from India, the UAE or Singapore. It ends with the questions to ask before you book. For how a whole move runs, see international moving with IMove.
Should you ship your household goods by sea or air?
Ship by sea when you are moving most of a home, because furniture and boxes take up space and air freight charges for that space as well as for weight, and send by air only the few cartons you need before the sea shipment can reach you, since volume and your date decide it.
Sea suits a whole household. Your goods travel in a container of your own, or share one with other households. The sailing is the long part, so sea suits anything you can live without for a while.
Air earns its place when a date is fixed. A new job, a school term or an empty rented flat are typical examples. The air shipment carries what you need until the rest arrives.
That is why you can split a move. A small air shipment goes first and the rest follows by sea. The last sections of this guide show what goes in each, and what customs expects of both.
How do sea and air freight compare?
Sea freight suits volume and is booked as a container of your own or a share of one, while air freight suits a few urgent cartons and is charged on chargeable weight, and the two also differ in where the time goes, which dangerous-goods code applies and whether the US advance filing applies.
The table sets the two side by side. Each row has its own section further down.
| Factor | Sea | Air |
|---|---|---|
| Suits | Most of a home | A few urgent cartons |
| Booked as | A whole container, or a share of one | Space on a flight |
| Charged on | Ask how it is measured | Chargeable weight |
| Long stretch | The sailing | Ground steps around the flight |
| Dangerous goods | The IMDG Code | IATA rules |
| US advance filing | ISF, before loading | Not this filing |
The US filing is the Importer Security Filing. It goes in at least 24 hours before a sea shipment is loaded abroad.
Why does air freight charge for space as well as weight?
Air freight is charged on chargeable weight, which is the greater of the shipment's actual weight and its volume weight, so a sofa, a mattress or a box of pillows is charged for the space it fills on the aircraft rather than for what it weighs.
One airline's published terms show the method. Under Vietnam Airlines Cargo’s conditions of carriage (opens in a new tab), the charge is the rate multiplied by the chargeable weight. Chargeable weight is the gross weight or the volume weight, whichever is higher.
A home is mostly bulky, light things. That is why air suits a few dense cartons better than furniture.
Sea freight is bought differently. A sole-use container is booked whole, and a shared container carries several households' goods. How a mover measures your part of a shared container is something to ask, not assume.
Ask each mover how they measure each shipment, by sea and by air. Two quotes compare fairly only when they measure the same way.
How long does each take, door to door?
Door to door, both modes pass through the same six stages, which are packing and collection, export clearance, terminal handling, the sailing or flight, import clearance and delivery, so flying shortens only one stage and the other five take their own time either way.
The diagram sets the two lanes side by side. Only the transit stage differs in kind.
Carrier schedules publish sailing times. These are the port-to-port times from Nhava Sheva, near Mumbai.
| Route | Sea leg | Schedule |
|---|---|---|
| Nhava Sheva to New York | 32 days | HMM, India America Express |
| Nhava Sheva to Singapore | 10 days | HMM, FIM service |
| Nhava Sheva to Jebel Ali | 4 days | Ocean Network Express (opens in a new tab), RGI service |
Door to door adds the other five stages at both ends. The route pages for India to the USA, India to Singapore and India to the UAE set out each route.
By air, the flight itself is short, and the other five stages still apply. A shared container also waits to fill before it sails, as the next section explains.
Ask for a door-to-door estimate in writing, stage by stage, for each shipment. A single transit figure may describe the sailing or the flight alone.
What can't go by air, and what should travel with you?
Many everyday items can count as dangerous goods by air, such as batteries, aerosols, perfume, household chemicals, paint, fuel and lighters, so each needs declaring to the carrier and some may be refused, while passports, originals, medicines and valuables should never be freight and belong with you as you travel.
Dangerous goods hiding in a home
The Civil Aviation Department of Hong Kong (opens in a new tab) publishes a shipper's checklist of items that can hide dangerous goods. These are the ones a home is likely to hold.
- Batteries, and anything with one, such as laptops, phones, power banks and e-bikes
- Aerosols, perfume, nail polish and other cosmetics
- Household chemicals, bleach, paint and glue
- Lawn mowers, generators and anything else that holds fuel
- Lighters, fireworks and ammunition
- Thermometers and fire extinguishers
Lithium batteries fly only within the limits the International Air Transport Association (opens in a new tab) sets on how they are packed and on their watt-hour rating or lithium content. Declare every device that holds one, laptops too.
Sea has its own rules. The International Maritime Organization (opens in a new tab)'s IMDG Code governs dangerous goods by sea, so dangerous goods in a container need declaring too.
Keep these with you
Some things should not be freight at all, by sea or by air. Carry these yourself.
- Passports and visas
- Original documents, such as degrees, deeds and birth certificates
- Medicines, with their prescriptions
- Jewellery and other valuables
- The papers customs asks for to clear your goods
Customs at several destinations asks for passport and visa copies to clear a shipment. Keep copies with the papers.
Does customs treat air and sea shipments differently?
Customs relief follows you and your goods rather than the mode, so used household goods qualify the same way whether they fly or sail, but each shipment must meet the destination's deadlines on its own, which matters most when part of a move goes by air and the rest by sea.
The diagram follows one move with two shipments. Each marker names the rule that applies at that point.
India applies one rule to all unaccompanied baggage, by sea or air, under India’s CBIC Baggage Rules, 2026 (opens in a new tab).
- It must have been in your possession abroad
- It must be dispatched within 1 month of your arrival in India
- It may land up to 2 months before you arrive
Singapore treats goods sent by a shipping line, an airline or a freight agent alike, under rules from Singapore Customs (opens in a new tab).
- The Declaration of Facts goes in before import and clearance
- Once the goods have arrived, the application is rejected and GST is due
- Goods must be imported within 6 months of your first arrival (Singapore Customs relief rules (opens in a new tab))
- Only one Declaration of Facts is allowed per air waybill or bill of lading, so a split move files two
An air shipment lands soon after it leaves. File its declaration before it flies.
The UK sets out its rules in HMRC’s Transfer of Residence relief (opens in a new tab) guidance, which allows more than one consignment.
- Goods must be imported within 12 months of coming to live in the UK
- They can arrive in multiple consignments
- So an air shipment and a later sea shipment can both qualify
Canada relieves goods that arrive later only if they are on the list you gave at your first arrival (Canada Border Services Agency (opens in a new tab)). Put the goods in both the air and the sea shipment on that list, and hand it in at your first arrival even if you bring nothing with you.
The USA needs an Importer Security Filing for the sea shipment only, sent at least 24 hours before it is loaded abroad (US Customs and Border Protection regulations, 19 CFR 149.2 (opens in a new tab)). The air shipment does not use this filing.
For the full relief conditions in each country, see the hidden costs of international moving. If you are leaving India, the India to Canada route page explains the goods-to-follow list.
How do you split a move between air and sea?
Split a move by sending by air only what you will need before the sea shipment reaches you and cannot easily buy on arrival, such as clothes, bedding and work papers, and by sending everything else by sea, including furniture, appliances, books and anything you can live without for a while.
The lists below are a starting point. Your own date and home decide the rest.
By air
Pack these for the air shipment.
- Clothes for the season you arrive in
- Bedding and towels
- A small kitchen set
- Children's essentials, such as school things and favourite toys
- Work papers, as copies, never the originals
By sea
Everything else goes in the sea shipment.
- Furniture and appliances
- Books, pictures and décor
- The rest of the kitchen
- Sports and hobby gear
- Clothes for other seasons
The air limits above still apply. A laptop or power bank in the air shipment must be declared.
If the sea shipment lands before your home is ready, the page on storage during an international move explains the options.
What should you ask your mover before choosing?
Put the same seven questions to every mover you are comparing, because the answers show how each one measures a shipment, how long each stage takes, who files the customs papers and whether the same protection applies to both the air and the sea shipment.
Ask every mover
- How do you measure each shipment, by sea and by air?
- What is the door-to-door estimate for each shipment, stage by stage?
- Is the sea shipment sole-use or shared, and when does it sail?
- Who files the customs papers for each shipment, such as a Declaration of Facts, an ISF or a goods-to-follow list?
- How are batteries, aerosols and perfume handled in each shipment?
- Does the same protection apply to the air shipment and the sea shipment?
- What happens if the sea shipment lands before my home is ready?
Signs a quote leaves gaps
- One transit figure with no stages
- No word on how the air shipment is measured
- Protection named for the sea shipment only
Common questions about sea and air freight
Is air freight worth it for a whole household move?
Air freight suits a whole household only when the move is very small, because airlines charge on chargeable weight, the greater of actual and volume weight, so bulky but light furniture and boxes are charged for the space they fill, and a home is better sent by sea, with a small air shipment first if you need things early. A fixed date can also justify a few cartons by air.
Can I send part of my move by air and part by sea?
Yes, you can send part of your move by air and the rest by sea, as long as each shipment meets the destination's customs deadlines on its own, such as India's dispatch rule, Singapore's declaration before the goods arrive and the UK's import window. Put both shipments on any list customs asks for at your first arrival.
Will I pay more duty if my goods come by air?
No, the mode does not change the duty on used household goods, because relief depends on who you are, how long you had the goods and when they arrive, so goods that qualify by sea qualify by air too, provided the air shipment meets the same deadlines and paperwork as the rest. The hidden costs guide sets out each country's conditions.
Is a shared container slower than a container of your own?
A shared container is slower to leave, because it waits until it has enough cargo from several households to sail, while a container of your own leaves once your goods are loaded, so the sailing itself may be the same but the wait before it is longer for a shared box. Ask when the next shared container is due to sail.
What happens if something is lost or damaged in transit?
What you get back depends on the protection your shipment travels under and how its declared values were set, so read the policy before you pack, and if you split a move, ask whether the same protection applies to the air shipment as well as the sea shipment. With IMove, your goods travel with all-risk marine cover at declared replacement value, included as standard.
Get started
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Tell us where you're moving from and to, what you're taking and when you need it. We'll come back with a quote you can check against the questions above.