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Flight Reliability

B6 861 · JetBlue Airways

Boston → San Juan (BOS–SJU)

75
Usually Fine
WanderNerd Reliability Score
81%
Arrive within 15 minutes
1 min
Average arrival delay
2.8%
Cancelled
9 min early
Median arrival delay

Based on 359 historical flights. Data through May 2026.

What the data says

Mornings have a slight edge.

Departures between 6–9 AM arrived on time 82% of the time, against 78% between 3–6 AM.

Thursday is the weak spot.

B6 861 arrived on time 90% of the time on Tuesdays. On Thursdays: 75%.

Better than the BOS–SJU route average.

B6 861 arrived on time 81% of the time, versus 70% across the BOS–SJU route.

Better than the JetBlue Airways network average.

B6 861 arrived on time 81% of the time, versus 73% across the JetBlue Airways network.

The breakdown

On-time by weekday
  • Mon80%(49 flights)
  • Tue90%(49 flights)
  • Wed77%(51 flights)
  • Thu75%(52 flights)
  • Fri86%(49 flights)
  • Sat82%(50 flights)
  • Sun79%(47 flights)
On-time by departure window
  • 3–6 AM78%(73 flights)
  • 6–9 AM82%(272 flights)
  • 9 AM–12 PM—(2 flights)
On-time trend by month
77%
May

Jun 88% → May 77% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202588%25
July 202594%31
August 202590%29
September 202570%30
October 202590%30
November 202586%28
December 202571%31
January 202667%27
February 202664%25
March 202690%30
April 202683%30
May 202677%31
Departures on time
89%
Diverted
0.6%
Flights flown
347
Months covered
12

Same route, other flights

Keep nerding

Based on 359 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.