United Airlines IAD to LAX on-time performance
United Airlines nonstop flights from Washington to Los Angeles · Aug 2025 – Jul 2026
On-time arrivals
84%
arrived < 15 min late
Cancelled
0.8%
19 flights
Avg arrival delay
10 min
59 min when late
Rank on route
#1 of 3
route average 84% on time
Key facts
- United Airlines flights on IAD to LAX arrived on time 84% of the time in Aug 2025 – Jul 2026.
- 0.8% were cancelled, and 5% arrived an hour or more late.
- That ranks #1 of 3 airlines on this route, which averaged 84% on time overall.
- The largest source of delay minutes was late-arriving aircraft (35%).
On-time trend by month
Why this airline's flights were late
- Late-arriving aircraft35%
- Airline (crew, maintenance, cleaning, fueling)32%
- Air traffic control & airport congestion25%
- Extreme weather8%
- Security0%
Other airlines on IAD to LAX
- American Airlines76% on time · 14 min avg delay
- Alaska Airlines47% on time · 24 min avg delay
Full IAD to LAX comparison →
United Airlines on-time record across all routes →
2,338 United Airlines flights tracked on this route; 19 cancelled, 3 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.