Historical on-time performance
Chicago to St. Thomas
Flights on ORD–STT arrive on time 54% of the time over the last 12 months.
based on 61 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
Not enough comparable data to name a most-on-time carrier — low-data carriers aren't ranked.
- American AirlinesOn-time55%Median5 minp9085 minCancel0.0%Flights31
- United AirlinesOn-time53%Median10 minp9055 minCancel0.0%Flights30
Why flights run late
Delay causes
- Airline38%
- Weather3%
- Air traffic (NAS)39%
- Late aircraft19%
- Security0%
Most delay minutes here are attributed to Air traffic (NAS).
When flights don't go
Why flights were cancelled
- Airline100%
- Weather0%
- Air traffic (NAS)0%
- Security0%
Most cancellations here are attributed to Airline. Shares are among 1 cancellations with a reported cause (BTS reports causes from June 2003).
Over time
On-time trend
By season
On-time rate by month
The seasonal pattern appears once multiple months of the year are loaded.
When to fly
Best time to fly ORD → STT
All airlines · rolling 36 months (2023-06 .. 2026-05).
Best day of week
On-time rates are fairly even by day on this route — ranging from 76% to 81% on time.
- Sundays81% on time · p90 35 min · 108 flights · limited
- Saturdays76% on time · p90 35 min · 186 flights · limited
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