Historical on-time performance
San Juan to Boston
Flights on SJU–BOS arrive on time 70% of the time over the last 12 months.
based on 1,911 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Delta Air LinesbestOn-time77%Medianon timep9035 minCancel1.5%Flights398
- Spirit AirlinesOn-time71%Medianon timep9060 minCancel3.9%Flights76
- JetBlue AirwaysOn-time68%Medianon timep9070 minCancel2.9%Flights1,437
Why flights run late
Delay causes
- Airline33%
- Weather1%
- Air traffic (NAS)18%
- Late aircraft47%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline22%
- Weather45%
- Air traffic (NAS)29%
- Security4%
Most cancellations here are attributed to Weather. Shares are among 51 cancellations with a reported cause (BTS reports causes from June 2003).
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly SJU → BOS
All airlines · rolling 36 months (2023-06 .. 2026-05).
Best time of day
On-time rates are fairly even by time of day on this route — ranging from 58% to 81% on time.
- Early mornings81% on time · p90 45 min · 279 flights
- Mornings77% on time · p90 35 min · 1,616 flights
- Middays76% on time · p90 50 min · 1,863 flights
- Afternoons67% on time · p90 80 min · 1,325 flights
- Overnights61% on time · p90 95 min · 441 flights
- Evenings58% on time · p90 100 min · 792 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 67% to 74% on time.
- Wednesdays74% on time · p90 50 min · 822 flights
- Tuesdays73% on time · p90 55 min · 847 flights
- Mondays72% on time · p90 65 min · 888 flights
- Fridays72% on time · p90 60 min · 891 flights
- Thursdays70% on time · p90 65 min · 926 flights
- Sundays70% on time · p90 70 min · 927 flights
- Saturdays67% on time · p90 75 min · 1,015 flights
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