Ferry Times Now is the only website that predicts whether your Seattle-Bremerton ferry will be on time, slightly delayed, or significantly late. Here is how our prediction system works and what the data shows.
The Data Behind the Predictions
Our prediction model is built on analysis of over 2,875 real WSF sailings on the Seattle-Bremerton route, tracked from June 2025 through early 2026. We compare actual departure times against scheduled times for every sailing, then identify the patterns that predict delays.
This is not guesswork or a simple average. We use a three-layer prediction model that accounts for the time of day, the day of the week, the season, and — most importantly — the real-time status of the incoming ferry.
How to Read the Predictions
Each departure on our schedule shows a color-coded delay prediction:
GREEN — Likely on time. Historical data shows this sailing typically departs within 0 to 2 minutes of schedule. About 62% of all sailings fall in this range.
ORANGE — Moderate delay risk. Expect a 3 to 5 minute delay. This is the most common outcome, covering about 83% of sailings. A few minutes late is essentially normal operations on this route.
RED — High delay risk. This sailing has a significant chance of running 6 or more minutes late. About 14% of all sailings fall in this category.
The Three Layers of Prediction
Layer 1: Static Baseline (Time Slot + Day Type)
Every departure time has a baseline delay profile based on historical performance. Some sailings are chronically late while others are remarkably punctual. For example, the 6:05 AM departure from Seattle runs 6 or more minutes late on 75% of sailings — making it the least reliable departure of the day. Meanwhile, the 3:00 PM departure from Bremerton averages just 1.4 minutes late with a 0% chance of a significant delay.
Layer 2: Cascade Effect Override
This is our most powerful predictor. When the ferry arrives late from its previous trip, it creates a cascade that delays the next departure. Our data shows that if the incoming boat is running 6 to 10 minutes late, there is a 43% chance your departure will also be significantly delayed. If the incoming boat is on time, that drops to just 6%. We monitor the real-time position of ferries and adjust predictions accordingly.
Layer 3: Seasonal Modifier
Delay patterns shift throughout the year. January is the worst month for delays, with higher winds and mechanical issues pushing the late rate above average. Summer months see increased traffic but generally better on-time performance. We apply monthly adjustment factors to fine-tune predictions.
Key Findings from Our Data
Weekends Are Worse
Weekend sailings are nearly twice as likely to run 6 or more minutes late compared to weekdays. Saturday is the worst day, with a 26.3% late rate versus 11.6% on weekdays. If you are traveling on a Saturday, build in extra buffer time.
The Most Reliable Departures
Based on our analysis, the most punctual departures from Bremerton are the 3:00 PM and 9:50 AM sailings (0% late rate, average delay under 2 minutes). From Seattle, the 11:10 AM and 6:45 PM departures are the most reliable.
The Least Reliable Departures
The first sailing of the day from Seattle (6:05 AM) is the most delay-prone. Weekend midday sailings also carry elevated risk, particularly the 12:20 PM from Seattle and 1:30 PM from Bremerton on Saturdays and Sundays.
How We Keep Improving
Our model is continuously updated as we collect more sailing data. The more sailings we track, the more accurate our predictions become. We are also working on incorporating weather data and vessel-specific performance metrics into future versions of the prediction engine.
Want to see the predictions in action? Check the next ferry to Seattle or next ferry to Bremerton for live color-coded departure predictions.