United Airlines MIA to IAD on-time performance
United Airlines nonstop flights from Miami to Washington · Aug 2025 – Jul 2026
On-time arrivals
84%
arrived < 15 min late
Cancelled
0.4%
2 flights
Avg arrival delay
13 min
77 min when late
Rank on route
#1 of 2
route average 83% on time
Key facts
- United Airlines flights on MIA to IAD arrived on time 84% of the time in Aug 2025 – Jul 2026.
- 0.4% were cancelled, and 7% 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 late-arriving aircraft (55%).
On-time trend by month
Why this airline's flights were late
- Late-arriving aircraft55%
- Air traffic control & airport congestion26%
- Airline (crew, maintenance, cleaning, fueling)15%
- Extreme weather4%
- Security0%
Other airlines on MIA to IAD
- Frontier Airlines77% on time · 13 min avg delay
Full MIA to IAD comparison →
United Airlines on-time record across all routes →
512 United Airlines flights tracked on this route; 2 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.