United Airlines ORD to STL on-time performance
United Airlines nonstop flights from Chicago to St. Louis · Aug 2025 – Jul 2026
On-time arrivals
73%
arrived < 15 min late
Cancelled
1.4%
8 flights
Avg arrival delay
21 min
75 min when late
Rank on route
#3 of 5
route average 72% on time
Key facts
- United Airlines flights on ORD to STL arrived on time 73% of the time in Aug 2025 – Jul 2026.
- 1.4% were cancelled, and 11% arrived an hour or more late.
- That ranks #3 of 5 airlines on this route, which averaged 72% on time overall.
- The largest source of delay minutes was late-arriving aircraft (53%).
On-time trend by month
Why this airline's flights were late
- Late-arriving aircraft53%
- Airline (crew, maintenance, cleaning, fueling)28%
- Air traffic control & airport congestion15%
- Extreme weather4%
- Security0%
Other airlines on ORD to STL
- SkyWest Airlines70% on time · 23 min avg delay
- Envoy Air75% on time · 14 min avg delay
- American Airlines66% on time · 32 min avg delay
- Republic Airways76% on time · 20 min avg delay
Full ORD to STL comparison →
United Airlines on-time record across all routes →
560 United Airlines flights tracked on this route; 8 cancelled, 0 diverted.
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. How we calculate this.