Flight Reliability
B6 661 · JetBlue Airways
Boston → San Juan (BOS–SJU)
68
Usually Fine
WanderNerd Reliability Score
- 79%
- Arrive within 15 minutes
- 14 min
- Average arrival delay
- 4.1%
- Cancelled
- 4 min early
- Median arrival delay
Based on 73 historical flights. Data through May 2026.
What the data says
The late departure is the smart one here.
B6 661 departing between 9 PM–12 AM arrived on time 89% of the time, versus 73% between 9 AM–12 PM.
Thursdays have been rough.
B6 661 arrived on time 92% of the time on Fridays and just 75% on Thursdays. That gap is worth planning around.
Better than the BOS–SJU route average.
B6 661 arrived on time 79% of the time, versus 70% across the BOS–SJU route.
A bit ahead of the JetBlue Airways network.
B6 661 arrived on time 79% of the time, versus 73% across the JetBlue Airways network.
The breakdown
- Mon82%(11 flights)
- Tue—(7 flights)
- Wed—(7 flights)
- Thu75%(12 flights)
- Fri92%(12 flights)
- Sat—(9 flights)
- Sun83%(12 flights)
- 9 AM–12 PM73%(44 flights)
- 9 PM–12 AM89%(26 flights)
82%
May
Feb 79% → May 82% on time
| Month | On-time percentage | Flights |
|---|---|---|
| February 2026 | 79% | 14 |
| March 2026 | 70% | 30 |
| April 2026 | 93% | 15 |
| May 2026 | 82% | 11 |
- Departures on time
- 79%
- Diverted
- 0%
- Flights flown
- 70
- Months covered
- 4
Same route, other flights
Keep nerding
Based on 73 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.