United Airlines SAN to DEN on-time performance
United Airlines nonstop flights from San Diego to Denver · Aug 2025 – Jul 2026
On-time arrivals
86%
arrived < 15 min late
Cancelled
0.7%
15 flights
Avg arrival delay
10 min
65 min when late
Rank on route
#1 of 5
route average 79% on time
Key facts
- United Airlines flights on SAN to DEN arrived on time 86% of the time in Aug 2025 – Jul 2026.
- 0.7% were cancelled, and 5% arrived an hour or more late.
- That ranks #1 of 5 airlines on this route, which averaged 79% on time overall.
- The largest source of delay minutes was late-arriving aircraft (47%).
On-time trend by month
Why this airline's flights were late
- Late-arriving aircraft47%
- Air traffic control & airport congestion35%
- Airline (crew, maintenance, cleaning, fueling)17%
- Extreme weather1%
- Security0%
Other airlines on SAN to DEN
- Southwest Airlines72% on time · 17 min avg delay
- Frontier Airlines82% on time · 15 min avg delay
- Alaska Airlines85% on time · 9 min avg delay
- SkyWest Airlines75% on time · 13 min avg delay
Full SAN to DEN comparison →
United Airlines on-time record across all routes →
2,074 United Airlines flights tracked on this route; 15 cancelled, 5 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.