United Airlines IAD to SAN on-time performance
United Airlines nonstop flights from Washington to San Diego · Aug 2025 – Jul 2026
On-time arrivals
88%
arrived < 15 min late
Cancelled
0.6%
6 flights
Avg arrival delay
8 min
61 min when late
Rank on route
#1 of 2
route average 84% on time
Key facts
- United Airlines flights on IAD to SAN arrived on time 88% 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 84% on time overall.
- The largest source of delay minutes was air traffic control & airport congestion (37%).
On-time trend by month
Why this airline's flights were late
- Air traffic control & airport congestion37%
- Airline (crew, maintenance, cleaning, fueling)31%
- Late-arriving aircraft19%
- Extreme weather13%
- Security0%
Other airlines on IAD to SAN
- Alaska Airlines75% on time · 13 min avg delay
Full IAD to SAN comparison →
United Airlines on-time record across all routes →
1,041 United Airlines flights tracked on this route; 6 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.