Getting to Saint-Barth by Boat
A 45-minute Caribbean crossing sensitive to weather conditions
The Boat: An Authentic Maritime Alternative
Getting to Saint-Barthelemy by boat from Saint-Martin offers an authentic and economical Caribbean experience, but this 45-minute crossing of the Saint-Barth channel is directly exposed to Atlantic weather conditions. Unlike the plane which can be affected occasionally, the boat is subject daily to the influence of trade winds, swell and sometimes changing tropical conditions.
This weather sensitivity makes maritime transport an option that is more flexible than the plane in terms of fares and frequency, but also more unpredictable in terms of comfort and punctuality. Understanding these dynamics is essential for planning your trip serenely to the chicest island in the Caribbean.
Whether you opt for the regular ferry, a private boat, or even your own sailboat, the weather will be your crossing companion. This guide explains everything you need to know to navigate to Saint-Barth with full knowledge.
Advantages & Disadvantages of Maritime Transport
Advantages
- Economical fares
45-75 EUR one way vs 150-300 EUR by plane
- Generous luggage allowance
Up to 2 suitcases of 23kg included
- Multiple daily departures
4-6 rotations/day depending on season
- Authentic maritime experience
Panoramic Caribbean sea view
- No airport constraints
Quick check-in, smooth boarding
- Booking flexibility
Tickets often available same day
Disadvantages
- Significant weather sensitivity
Frequent cancellations/delays if strong swell
- Variable comfort depending on conditions
Rough crossing possible even in "moderate" sea
- Risk of seasickness
Particularly high season (strong trade winds)
- Fixed travel time
45min minimum vs 10min by plane
- Geographic constraint
Requires transit through Saint-Martin first
- Schedules dependent on weather
Same-day schedule changes possible
Our Verdict
The boat is ideal if you have time, a tight budget and accept weather unpredictability. Perfect for flexible travelers or long stays. If you have a tight international connection or reduced mobility, prefer the plane despite its higher cost.
Weather Impact on the Maritime Crossing
Weather is the most determining factor for your crossing. Here's how different conditions affect your trip.
Wind (Trade Winds)
Comfortable crossing, calm sea. All ferries operate normally. Travel time respected (45min).
Choppy sea, slight pitching. Less comfortable but safe crossing. Slight seasickness risk for sensitive people.
Rough sea, marked pitching/rolling. Some ferries may cancel. Frequent seasickness. Not recommended for children/seniors.
Stormy sea. Maritime connections suspended for safety. Frequent January-March (strong trade winds).
Atlantic Swell
Imperceptible swell. Smooth navigation, no discomfort. Rare but ideal situation, typical low season (summer).
Perceptible but manageable swell. Slight shaking. Standard condition 60% of the year. Well tolerated by most.
Marked swell creating significant vertical movement. Seasickness likely. Common winter high season. Grueling trip.
Strong swell, dangerous conditions. Maritime service interrupted. Wait for favorable conditions to return.
Rain & Visibility
Optimal visibility. Safe navigation. Panoramic view of coasts. Maximum crossing experience.
Rain generally doesn't affect crossing. Temporarily reduced visibility. Outdoor decks inaccessible. Indoor cabins recommended.
Possible delays waiting for storm cell to dissipate. Navigation diverted if necessary. Extends trip time by 15-30min.
Depression/tropical wave: service suspended 1-3 days. Hurricane: prolonged stop until system passes. Rescheduling necessary.
Understanding Weather Cancellations
Maritime companies always prioritize safety over punctuality. A crossing may be cancelled even if conditions seem "acceptable" from land because:
- -The Saint-Barth channel is exposed due East to Atlantic trade winds, creating difficult cross seas
- -Ocean swell can be strong even without apparent local wind
- -Forecasts change rapidly in tropical zones (sudden showers)
- -Maneuvering in ports of Gustavia and Marigot becomes risky if wind is strong
Practical tip: If weather forecasts borderline conditions (wind 20+ knots), call the maritime company the same morning before going to the port. You'll save time and stress.
Ferry Companies & 2025 Fares
Voyager
Main operator2025 Fares
+ Luggage allowance: 2 suitcases 23kg included
+ Air-conditioned cabin and outdoor deck
+ Bar on board
+ Refund if weather cancellation
Great Bay Express
Alternative2025 Fares
+ Luggage allowance: 2 suitcases 23kg included
+ More comfortable fast ferry
+ Assigned seats
+ Food service
Booking & Tips
- High season (December-April): booking 2-3 days in advance recommended
- Low season: tickets often available same day at the counter
- Check-in: arrive 30 minutes before departure with ID
- Weather cancellation: full refund or free rebooking on next crossing
How to Avoid Seasickness: Practical Guide
Seasickness affects up to 30% of passengers during rough crossings. Here's how to minimize risks and discomfort.
Before the Crossing
- Check marine weather: verify wind and swell forecasts the day before and the same morning
- Preventive medication: take anti-nausea medication 1h before (Dramamine, Bonine) on pharmacist's advice
- Light meal: avoid empty or overly full stomach; prefer simple starches
- Alcohol and coffee: limit 12h before (dehydration worsens symptoms)
- Good night's sleep: fatigue increases susceptibility to seasickness
During the Crossing
- Strategic positioning: center of the boat, near windows, avoid closed cabin
- Fix on horizon: looking at the horizon line stabilizes the inner ear
- Fresh air: stay on outdoor deck if conditions allow (secure your glasses!)
- Avoid screens: reading and smartphones worsen nausea
- Regular hydration: small sips of water or ginger ale
- Relaxation: deep breathing helps control nausea
Natural Solutions
- Acupressure bracelet: pressure on P6 point (wrist) reduces nausea in 60% of cases
- Ginger: candies or infusion, recognized anti-nausea properties
- Peppermint essential oil: inhaling relieves discomfort (3 drops on a tissue)
Choosing the Right Time
For the most comfortable crossing possible, prefer:
- Low season (May-November): sea generally calmer, weaker trade winds
- First morning crossing: sea often calmer before noon
- Avoid periods December-March if very sensitive (strong trade winds)
- Check Windy.com 48h before to anticipate actual conditions
Frequently Asked Questions About the Boat Crossing
Does the boat operate year-round?
Yes, maritime service operates 365 days/year except in extreme weather conditions. Reduced frequency in low season (2-3 rotations vs 6 in high season). Temporary suspensions possible during tropical system passages.
How far in advance to book in high season?
Recommended 2-3 days in advance December-March to guarantee your preferred time. Last minute possible but risk of full morning/evening return slots being taken.
What happens if my ferry is cancelled for weather?
You have the choice between full refund or free rebooking on the next available crossing. Companies usually notify 2-4h before by SMS/email if cancellation is foreseeable. Always check the same morning if weather is doubtful.
Can I transport sports equipment (diving, surfing)?
Yes, sports equipment is accepted within luggage allowance (2 suitcases 23kg). Surfboards/paddleboards charged extra 15-25 EUR depending on size. Empty diving tanks accepted; filled ones prohibited (safety).
Is the trip accessible for people with reduced mobility?
Yes but conditions depend on the sea. Calm sea: assisted boarding/disembarkation possible. Rough sea: not recommended as boat movement makes circulation difficult even with assistance. Notify the company when booking for preparation.
Are there toilets and food service on board?
Toilets available on all ferries. Bar offering cold drinks, snacks, sandwiches on Voyager and Great Bay Express. No hot meals (short 45min duration). Coffees 3-4 EUR, sandwiches 6-8 EUR.