United Airlines IAD to MIA on-time performance
United Airlines nonstop flights from Washington to Miami · Aug 2025 – Jul 2026
On-time arrivals
86%
arrived < 15 min late
Cancelled
0.6%
3 flights
Avg arrival delay
10 min
65 min when late
Rank on route
#1 of 2
route average 83% on time
Key facts
- United Airlines flights on IAD to MIA arrived on time 86% of the time in Aug 2025 – Jul 2026.
- 0.6% were cancelled, and 4% arrived an hour or more late.
- That ranks #1 of 2 airlines on this route, which averaged 83% on time overall.
- The largest source of delay minutes was air traffic control & airport congestion (52%).
On-time trend by month
Why this airline's flights were late
- Air traffic control & airport congestion52%
- Airline (crew, maintenance, cleaning, fueling)24%
- Late-arriving aircraft23%
- Extreme weather1%
- Security0%
Other airlines on IAD to MIA
- Frontier Airlines69% on time · 21 min avg delay
Full IAD to MIA comparison →
United Airlines on-time record across all routes →
512 United Airlines flights tracked on this route; 3 cancelled, 1 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.