United Airlines ORD to MIA on-time performance
United Airlines nonstop flights from Chicago to Miami · Aug 2025 – Jul 2026
On-time arrivals
74%
arrived < 15 min late
Cancelled
0.7%
8 flights
Avg arrival delay
17 min
63 min when late
Rank on route
#2 of 4
route average 74% on time
Key facts
- United Airlines flights on ORD to MIA arrived on time 74% of the time in Aug 2025 – Jul 2026.
- 0.7% were cancelled, and 8% arrived an hour or more late.
- That ranks #2 of 4 airlines on this route, which averaged 74% on time overall.
- The largest source of delay minutes was air traffic control & airport congestion (36%).
On-time trend by month
Why this airline's flights were late
- Air traffic control & airport congestion36%
- Late-arriving aircraft33%
- Airline (crew, maintenance, cleaning, fueling)22%
- Extreme weather9%
- Security0%
Other airlines on ORD to MIA
- American Airlines76% on time · 19 min avg delay
- Spirit Airlines60% on time · 29 min avg delay
- Frontier Airlines64% on time · 43 min avg delay
Full ORD to MIA comparison →
United Airlines on-time record across all routes →
1,071 United Airlines flights tracked on this route; 8 cancelled, 6 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.