Shipping a Vehicle by Sea: How Ocean Transport Works
Once a vehicle has to cross water, almost everything you know about road transport stops applying. Ocean moves run on fixed sailing schedules rather than driving hours, they are priced on measured volume rather than mileage, the car must be completely empty by federal rule, and the paperwork rather than the road usually sets the timeline. That covers Hawaii, Alaska, Puerto Rico and anywhere overseas. Here is how the sea leg actually works and where it joins up with the trucking either side of it.
Two Ways a Car Crosses Water
There are really only two methods, and which one you get depends on the route and the vehicle.
Roll on roll off is exactly what it sounds like. The car is driven onto a purpose built vessel, secured on a deck alongside hundreds of others, and driven off at the far end. It is the cheaper option, it is how most vehicles move, and it requires the car to run and drive. Nothing can be inside it.
Container shipping puts the vehicle inside a steel container, either alone or sharing with other cars. It costs more and takes a little longer to arrange, and it is the right answer for a non running vehicle, something valuable enough to justify being enclosed, or a route where roll on roll off service does not exist.
For an ordinary running car on a served route, roll on roll off is the sensible default in the same way open transport is on the road.
The Sea Leg Is Only Part of the Trip
This is the thing most people underestimate. A vehicle going from, say, Georgia to Honolulu spends more of its journey on a truck than on a ship.
The shape is almost always the same: a road carrier collects the car and drives it to the departure port, it waits for a scheduled sailing, it crosses, and then either you collect it at the destination port or a local carrier takes it the last leg. Each handoff is a point where the schedule can move.
Because sailings run weekly rather than continuously, arriving at the port a day after a vessel leaves costs a week, not a day. That is why ocean moves are quoted in weeks and why booking three to four weeks ahead genuinely matters here in a way it does not on a short road move.
The Car Travels Empty
Not a preference, a rule. Vehicles on ocean sailings must be empty of personal belongings apart from factory equipment, and carriers inspect for it. A car found loaded is held until it is emptied, which usually means missing the sailing.
Empty means no boxes, no tools, nothing in the trunk or glovebox. Remove roof racks and bike carriers too, because ocean rates are calculated from the vehicle’s measured dimensions and anything on the roof increases them. Fuel is normally required at or below a quarter tank.
Some destinations add a cleanliness requirement on top. Hawaii inspects arriving vehicles for soil and plant material, so the car needs to be genuinely clean underneath as well as on the paint.
Paperwork Sets the Timeline
On a domestic road move the paperwork is a bill of lading. On an ocean move it is the critical path.
Expect to need the original title or current registration rather than a photocopy, photo identification matching the paperwork, and a lien authorization letter if the vehicle is financed or leased. That last one is the usual cause of a missed sailing, because lenders routinely take a week or more to issue it. Request it the moment you decide to move.
Anyone other than the registered owner delivering or collecting the car generally needs a notarized letter of authorization. International moves add customs documentation on both sides, and destination countries set their own rules on vehicle age, emissions and duties, some of which make importing a personal car impractical. Our international car shipping guide covers those.
How It Is Priced
Ocean pricing does not work like road pricing, and knowing that prevents an unpleasant surprise.
Road transport is priced largely on distance. Ocean transport is priced on the space the vehicle occupies, so a full size truck or SUV costs meaningfully more than a sedan on the identical sailing, and a roof box or lift kit can move you into a higher bracket. Port handling and terminal charges are usually separate line items, and a non running vehicle attracts handling fees at each transfer because it has to be winched rather than driven.
Ask for the total including the road legs, port handling and any documentation fees, rather than a sailing price alone. A quote covering only the ocean portion is not the number you will pay.
The Domestic Routes People Actually Use
Most sea moves booked in the United States are not international at all. Hawaii is the largest by volume, served from West Coast ports with an onward barge to the neighbor islands. Alaska runs from Washington state up to Anchorage. Puerto Rico sails from the East Coast and Gulf.
All three follow the pattern above: a road leg, a scheduled sailing, and paperwork that decides whether you make it. Three to five weeks door to door is a realistic expectation on any of them.
Common Questions
Roll on roll off or container? Roll on roll off for a running car on a served route. Container for a non runner, a valuable vehicle, or a route without vessel service.
How long does it take? Three to five weeks door to door on most routes, because the road legs and the sailing schedule dominate.
Can I pack belongings in the car? No. Vehicles must be empty, and a loaded car misses its sailing.
Why does an SUV cost so much more? Ocean rates are based on measured volume rather than distance, so size matters more at sea than on the road.
What delays shipments most often? The lien authorization letter. Request it from your lender as early as possible.
Get a Quote
Call Ship A Car, Inc. at (866) 821-4555 with your origin, destination port or island, and whether the vehicle runs, and we will quote the road and sea legs together.
