Historical on-time performance
Chicago to San Juan
2,072 miData through Dec 2025Source: US DOT · BTS
Flights on ORD–SJU arrive on time 78% of the time over the last 12 months.
On-time rate78%arrived within 15 min
p90 delay40 min1 in 10 flights is worse (tail risk)
Cancelled0.2%of scheduled flights
based on 1,108 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-time79%Medianon timep9035 minCancel0.0%Flights624
- American AirlinesOn-time79%Medianon timep9035 minCancel0.0%Flights253
- Spirit AirlinesOn-time75%Medianon timep9050 minCancel0.9%Flights231
Why flights run late
Delay causes
- Airline37%
- Weather7%
- Air traffic (NAS)32%
- Late aircraft24%
- Security0%
Most delay minutes here are attributed to Airline.
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 (2023-01 .. 2025-12).
Best time of day
On-time rates are fairly even by time of day on this route — ranging from 65% to 81% on time.
- Afternoons81% on time · p90 30 min · 358 flights
- Mornings80% on time · p90 35 min · 2,300 flights
- Middays80% on time · p90 40 min · 334 flights
- Overnights77% on time · p90 45 min · 133 flights · limited
- Evenings65% on time · p90 60 min · 303 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 75% to 84% on time.
- Tuesdays84% on time · p90 25 min · 451 flights
- Mondays81% on time · p90 35 min · 495 flights
- Thursdays80% on time · p90 30 min · 483 flights
- Saturdays78% on time · p90 40 min · 552 flights
- Wednesdays78% on time · p90 40 min · 440 flights
- Sundays75% on time · p90 45 min · 487 flights
- Fridays75% on time · p90 40 min · 520 flights
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