United Airlines SFO to IAH on-time performance
United Airlines nonstop flights from San Francisco to Houston · Aug 2025 – Jul 2026
On-time arrivals
84%
arrived < 15 min late
Cancelled
0.3%
10 flights
Avg arrival delay
9 min
52 min when late
Rank on route
#1 of 1
route average 84% on time
Key facts
- United Airlines flights on SFO to IAH arrived on time 84% of the time in Aug 2025 – Jul 2026.
- 0.3% were cancelled, and 4% arrived an hour or more late.
- That ranks #1 of 1 airlines on this route, which averaged 84% on time overall.
- The largest source of delay minutes was airline (crew, maintenance, cleaning, fueling) (42%).
On-time trend by month
Why this airline's flights were late
- Airline (crew, maintenance, cleaning, fueling)42%
- Late-arriving aircraft31%
- Air traffic control & airport congestion27%
- Extreme weather1%
- Security0%
Other airlines on SFO to IAH
3,598 United Airlines flights tracked on this route; 10 cancelled, 7 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.