Flight Reliability
B6 398 · JetBlue Airways
Seattle → Boston (SEA–BOS)
49
Bring Snacks
WanderNerd Reliability Score
- 59%
- Arrive within 15 minutes
- 31 min
- Average arrival delay
- 0.6%
- Cancelled
- 9 min
- Median arrival delay
Based on 165 historical flights. Data through May 2026.
What the data says
The 12–3 PM departure wins.
B6 398 departing between 12–3 PM arrived on time 80% of the time, versus 56% between 9 AM–12 PM.
Sunday scaries are real for this one.
B6 398 arrived on time 74% of the time on Wednesdays and just 48% on Sundays. That gap is worth planning around.
Well behind the SEA–BOS route.
B6 398 arrived on time 59% of the time, versus 75% across the SEA–BOS route.
Lagging the JetBlue Airways network.
B6 398 arrived on time 59% of the time, versus 73% across the JetBlue Airways network.
The breakdown
- Mon61%(23 flights)
- Tue57%(23 flights)
- Wed74%(23 flights)
- Thu52%(23 flights)
- Fri58%(24 flights)
- Sat61%(23 flights)
- Sun48%(23 flights)
- 9 AM–12 PM56%(142 flights)
- 12–3 PM80%(20 flights)
33%
May
Jun 60% → May 33% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 60% | 30 |
| July 2025 | 28% | 29 |
| August 2025 | 67% | 30 |
| September 2025 | 73% | 30 |
| October 2025 | 84% | 25 |
| May 2026 | 33% | 18 |
- Departures on time
- 54%
- Diverted
- 1.2%
- Flights flown
- 162
- Months covered
- 6
Same route, other flights
Keep nerding
Based on 165 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.