Historical on-time performance
San Juan to Chicago
2,072 miData through May 2026Source: US DOT · BTS
Flights on SJU–ORD arrive on time 77% of the time over the last 12 months.
On-time rate77%arrived within 15 min
p90 delay35 min1 in 10 flights is worse (tail risk)
Cancelled2.2%of scheduled flights
based on 1,258 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- United AirlinesbestOn-time82%Medianon timep9020 minCancel0.6%Flights665
- Spirit AirlinesOn-time74%Medianon timep9045 minCancel7.3%Flights219
- American AirlinesOn-time70%Medianon timep9065 minCancel2.1%Flights374
Why flights run late
Delay causes
- Airline44%
- Weather7%
- Air traffic (NAS)19%
- Late aircraft30%
- Security0%
Most delay minutes here are attributed to Airline.
When flights don't go
Why flights were cancelled
- Airline29%
- Weather39%
- Air traffic (NAS)32%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 28 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 → ORD
All airlines · rolling 36 months (2023-06 .. 2026-05).
Best time of day
Mornings are the most reliable time of day to fly this route — 91% on time.
- Mornings91% on time · p90 10 min · 1,025 flights
- Overnights78% on time · p90 65 min · 124 flights · limited
- Afternoons70% on time · p90 45 min · 2,318 flights
- Middays69% on time · p90 50 min · 143 flights · limited
Best day of week
On-time rates are fairly even by day on this route — ranging from 74% to 78% on time.
- Sundays78% on time · p90 35 min · 590 flights
- Mondays77% on time · p90 35 min · 544 flights
- Fridays77% on time · p90 40 min · 548 flights
- Wednesdays76% on time · p90 30 min · 479 flights
- Tuesdays76% on time · p90 40 min · 512 flights
- Saturdays75% on time · p90 45 min · 561 flights
- Thursdays74% on time · p90 30 min · 536 flights
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