United Airlines ATL to ORD on-time performance
United Airlines nonstop flights from Atlanta to Chicago · Aug 2025 – Jul 2026
On-time arrivals
75%
arrived < 15 min late
Cancelled
1.6%
27 flights
Avg arrival delay
24 min
91 min when late
Rank on route
#4 of 9
route average 71% on time
Key facts
- United Airlines flights on ATL to ORD arrived on time 75% of the time in Aug 2025 – Jul 2026.
- 1.6% were cancelled, and 10% arrived an hour or more late.
- That ranks #4 of 9 airlines on this route, which averaged 71% on time overall.
- The largest source of delay minutes was air traffic control & airport congestion (45%).
On-time trend by month
Why this airline's flights were late
- Air traffic control & airport congestion45%
- Late-arriving aircraft28%
- Airline (crew, maintenance, cleaning, fueling)22%
- Extreme weather5%
- Security0%
Other airlines on ATL to ORD
- Delta Air Lines69% on time · 21 min avg delay
- Frontier Airlines64% on time · 40 min avg delay
- American Airlines72% on time · 30 min avg delay
- Envoy Air71% on time · 25 min avg delay
- Republic Airways69% on time · 25 min avg delay
- Spirit Airlines80% on time · 7 min avg delay
- SkyWest Airlines84% on time · 15 min avg delay
- PSA Airlines100% on time · 0 min avg delay
Full ATL to ORD comparison →
United Airlines on-time record across all routes →
1,668 United Airlines flights tracked on this route; 27 cancelled, 8 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.