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Flight Reliability

B6 561 · JetBlue Airways

Boston → San Juan (BOS–SJU)

49
Bring Snacks
WanderNerd Reliability Score
59%
Arrive within 15 minutes
26 min
Average arrival delay
2.5%
Cancelled
6 min
Median arrival delay

Based on 284 historical flights. Data through May 2026.

What the data says

The 3–6 PM departure wins.

B6 561 departing between 3–6 PM arrived on time 73% of the time, versus 38% between 9 PM–12 AM.

Sunday scaries are real for this one.

B6 561 arrived on time 65% of the time on Saturdays and just 45% on Sundays. That gap is worth planning around.

Lagging the BOS–SJU route.

B6 561 arrived on time 59% of the time, versus 70% across the BOS–SJU route.

Lagging the JetBlue Airways network.

B6 561 arrived on time 59% of the time, versus 73% across the JetBlue Airways network.

The breakdown

On-time by weekday
  • Mon57%(44 flights)
  • Tue63%(38 flights)
  • Wed61%(38 flights)
  • Thu60%(42 flights)
  • Fri62%(42 flights)
  • Sat65%(31 flights)
  • Sun45%(42 flights)
On-time by departure window
  • 9 AM–12 PM73%(11 flights)
  • 3–6 PM73%(30 flights)
  • 6–9 PM59%(199 flights)
  • 9 PM–12 AM38%(37 flights)
On-time trend by month
77%
May

Jun 80% → May 77% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202580%30
July 202566%29
August 202552%31
November 202557%21
December 202548%29
January 202650%26
February 202646%24
March 202660%30
April 202650%28
May 202677%22
Departures on time
56%
Diverted
0%
Flights flown
277
Months covered
12

Same route, other flights

Keep nerding

Based on 284 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.