Historical on-time performance
Chicago to San Antonio
1,041 miData through Dec 2025Source: US DOT · BTS
Flights on ORD–SAT arrive on time 74% of the time over the last 12 months.
On-time rate74%arrived within 15 min
p90 delay60 min1 in 10 flights is worse (tail risk)
Cancelled1.3%of scheduled flights
based on 1,550 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- American AirlinesOn-time69%Medianon timep9065 minCancel1.8%Flights785
- United AirlinesbestOn-time78%Medianon timep9050 minCancel0.8%Flights765
Why flights run late
Delay causes
- Airline31%
- Weather3%
- Air traffic (NAS)12%
- Late aircraft54%
- Security0%
Most delay minutes here are attributed to Late aircraft.
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly ORD → SAT
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.
- Middays81% on time · p90 30 min · 707 flights
- Mornings81% on time · p90 30 min · 1,658 flights
- Evenings70% on time · p90 60 min · 780 flights
- Afternoons67% on time · p90 60 min · 243 flights
- Overnights65% on time · p90 75 min · 1,247 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 71% to 78% on time.
- Tuesdays78% on time · p90 55 min · 605 flights
- Wednesdays76% on time · p90 55 min · 629 flights
- Thursdays75% on time · p90 45 min · 705 flights
- Mondays74% on time · p90 50 min · 711 flights
- Saturdays74% on time · p90 65 min · 572 flights
- Fridays72% on time · p90 55 min · 706 flights
- Sundays71% on time · p90 50 min · 708 flights
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