Historical on-time performance
Chicago to San Juan
Flights on ORD–SJU arrive on time 73% of the time over the last 12 months.
based on 1,264 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
Too close to call — no single carrier is clearly more on-time here.
- United AirlinesOn-time78%Medianon timep9030 minCancel0.3%Flights665
- American AirlinesOn-time75%Medianon timep9060 minCancel1.6%Flights377
- Spirit AirlinesOn-time53%Median5 minp9090 minCancel8.6%Flights222
Why flights run late
Delay causes
- Airline35%
- Weather7%
- Air traffic (NAS)30%
- Late aircraft27%
- Security0%
Most delay minutes here are attributed to Airline.
When flights don't go
Why flights were cancelled
- Airline26%
- Weather48%
- Air traffic (NAS)26%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 27 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 ORD → SJU
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 67% to 82% on time.
- Afternoons82% on time · p90 30 min · 427 flights
- Mornings79% on time · p90 30 min · 2,411 flights
- Middays75% on time · p90 45 min · 448 flights
- Overnights68% on time · p90 70 min · 219 flights
- Evenings67% on time · p90 60 min · 263 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 74% to 83% on time.
- Tuesdays83% on time · p90 30 min · 500 flights
- Wednesdays79% on time · p90 40 min · 489 flights
- Mondays78% on time · p90 40 min · 545 flights
- Thursdays78% on time · p90 35 min · 542 flights
- Saturdays77% on time · p90 40 min · 592 flights
- Fridays75% on time · p90 40 min · 569 flights
- Sundays74% on time · p90 45 min · 542 flights
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