On many routes you'll find a choice between two quite different kinds of vessel: a large, slower ro-pax ferry, and a smaller, faster catamaran-style fast ferry. They're not simply cheap-versus-expensive versions of the same trip — they suit different journeys, different sea conditions and different kinds of traveller. Here's what actually separates them and how to pick between the two when a route offers both.
What "ro-pax" means
Ro-pax stands for roll-on/roll-off passenger ferry — a large vessel designed to carry both vehicles, which drive on and off under their own power, and passengers, in a single ship. Ro-pax ferries are the standard vessel type on most of the world's major car-ferry routes: the English Channel, the Baltic Sea, the Adriatic between Italy and Croatia or Greece, and most Scandinavian and Mediterranean crossings. They range from mid-sized vessels on short routes to enormous multi-deck ships on longer or overnight crossings, complete with cabins, restaurants, shops and lounges.
Ro-pax vessels are built for capacity and stability rather than speed. Typical cruising speeds sit around 20–25 knots, and the hull design — a conventional displacement hull — handles rougher seas comparatively well, which is a large part of why they dominate longer sea crossings and routes prone to swell.
What "fast ferry" means
Fast ferry usually refers to a high-speed craft — most commonly a catamaran, sometimes a hydrofoil on some routes — that skims across the water rather than ploughing through it, reaching speeds often around 35–40 knots or more, roughly double a conventional ro-pax. Fast ferries are common on shorter routes where the time saving really matters: the Greek islands in summer, parts of the Adriatic, and some short Baltic and Scandinavian hops. Many fast ferry designs carry passengers only or a very limited number of vehicles, and comfort features on board are generally more basic than a large ro-pax — closer to airline-style seating than a ship with cabins and multiple decks to wander.
Speed and journey time
This is the fast ferry's headline advantage: a crossing that takes a ro-pax three or four hours might take a fast ferry under two. On island-hopping routes in Greece or Croatia, where you might be making several short hops in a single trip, that time saving compounds quickly across a multi-leg itinerary and can be the difference between fitting in an extra island or not.
Comfort and the motion of the sea
This is where the comparison usually swings the other way. A large ro-pax's displacement hull sits more steadily in a swell and offers more space to move around — open decks, several lounges, sometimes cabins to lie down in — which matters on a longer crossing or in anything other than calm conditions. Fast ferries, built light for speed, are noticeably more affected by rough seas: the catamaran hull design that makes them fast also makes them more prone to a jarring, choppy motion when the water isn't calm, and operators sometimes cancel fast ferry sailings in weather that a ro-pax would sail through without issue. If you're prone to seasickness, a ro-pax in anything but flat calm conditions is generally the more comfortable choice — see our guide on avoiding seasickness on ferries for more on this.
Fast ferries are cancelled or delayed for weather more readily than large ro-pax vessels, because their light hulls and shallow draught make them less stable in strong wind and swell. On weather-exposed routes — open Aegean crossings in particular — build a buffer into your itinerary if you're relying on a fast ferry connection, and check the operator's cancellation and rebooking policy before you travel.
Price
Fast ferries typically cost more than the equivalent ro-pax crossing on the same route, reflecting both the time saved and the higher operating cost of running a high-speed craft. The gap varies by route and season but is often noticeable enough to factor into the decision, particularly for a family or group where the price difference multiplies across several tickets. If your schedule has flexibility, taking the slower ro-pax and simply allowing more time is often the better value option; if time is tight — a single day to island-hop, or a tight onward connection — the fast ferry's premium can be worth paying.
Vehicles: not always an option on a fast ferry
Many fast ferry services, especially smaller catamarans on island routes, carry passengers only or a small number of vehicles compared with a full ro-pax car deck. If you're travelling with a car — see our guide to booking a ferry with a car — check the specific vessel type before assuming your car has a place on the fast option; on some routes the fast service simply doesn't take vehicles at all, and the ro-pax is the only way to bring one across.
Which should you choose?
- Choose the ro-pax if you're taking a vehicle, prefer a calmer and more comfortable crossing, are prone to seasickness, are travelling overnight, or the route is exposed to open water where fast ferries are more likely to be cancelled.
- Choose the fast ferry if you're a foot passenger, time genuinely matters — a multi-island itinerary in a short trip, or a tight connection — and the route and season have a reasonable track record of running on schedule.
On routes where both exist side by side, such as several Greek island connections, it's common for the same operator to run both vessel types at different times of day, so check the specific sailing's vessel type when booking rather than assuming every departure on that route is the same kind of ship.
Frequently asked questions
Is a fast ferry always faster door to door?
Usually, yes, on the water — but factor in that fast ferries are cancelled or delayed for weather more often, which can erase the time saving if your sailing is affected. On a tight connection, that risk is worth weighing against the time saved.
Can I take a car on a fast ferry?
Sometimes, but not always — many fast ferry services carry passengers only or a limited number of vehicles. Check the specific vessel and route before booking if you need to bring a car.
Which is better for seasickness, ro-pax or fast ferry?
A ro-pax generally handles rough water more comfortably thanks to its heavier, more stable hull. Fast ferries, built light for speed, are more affected by swell and chop, so a ro-pax is usually the better choice if you're prone to seasickness.
Why is the fast ferry more expensive?
It reflects both the time saved and the higher cost of operating a high-speed vessel. The premium varies by route and season, and is often worth weighing against simply taking the slower, cheaper ro-pax if your schedule allows.
Sources and further reading:
- Vessel types and route deployment: operator fleet pages, including Brittany Ferries, DFDS and Mediterranean and Aegean operators.
- Weather-related cancellation policies: individual ferry operator terms and conditions.
- Related: How to avoid seasickness on ferries and how to book a ferry with a car on Viamo.