United Airlines STL to ORD on-time performance
United Airlines nonstop flights from St. Louis to Chicago · Aug 2025 – Jul 2026
On-time arrivals
72%
arrived < 15 min late
Cancelled
2.2%
12 flights
Avg arrival delay
24 min
80 min when late
Rank on route
#4 of 5
route average 73% on time
Key facts
- United Airlines flights on STL to ORD arrived on time 72% of the time in Aug 2025 – Jul 2026.
- 2.2% were cancelled, and 9% arrived an hour or more late.
- That ranks #4 of 5 airlines on this route, which averaged 73% on time overall.
- The largest source of delay minutes was air traffic control & airport congestion (63%).
On-time trend by month
Why this airline's flights were late
- Air traffic control & airport congestion63%
- Airline (crew, maintenance, cleaning, fueling)24%
- Late-arriving aircraft10%
- Extreme weather2%
- Security0%
Other airlines on STL to ORD
- SkyWest Airlines64% on time · 39 min avg delay
- Envoy Air75% on time · 24 min avg delay
- American Airlines81% on time · 26 min avg delay
- Republic Airways75% on time · 20 min avg delay
Full STL to ORD comparison →
United Airlines on-time record across all routes →
557 United Airlines flights tracked on this route; 12 cancelled, 2 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.