United Airlines IAH to SFO on-time performance
United Airlines nonstop flights from Houston to San Francisco · Aug 2025 – Jul 2026
On-time arrivals
78%
arrived < 15 min late
Cancelled
0.5%
17 flights
Avg arrival delay
15 min
63 min when late
Rank on route
#1 of 1
route average 78% on time
Key facts
- United Airlines flights on IAH to SFO arrived on time 78% of the time in Aug 2025 – Jul 2026.
- 0.5% were cancelled, and 7% arrived an hour or more late.
- That ranks #1 of 1 airlines on this route, which averaged 78% on time overall.
- The largest source of delay minutes was air traffic control & airport congestion (46%).
On-time trend by month
Why this airline's flights were late
- Air traffic control & airport congestion46%
- Late-arriving aircraft26%
- Airline (crew, maintenance, cleaning, fueling)24%
- Extreme weather3%
- Security0%
Other airlines on IAH to SFO
3,598 United Airlines flights tracked on this route; 17 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.