United Airlines IAH to SEA on-time performance
United Airlines nonstop flights from Houston to Seattle · Aug 2025 – Jul 2026
On-time arrivals
78%
arrived < 15 min late
Cancelled
0.2%
3 flights
Avg arrival delay
13 min
53 min when late
Rank on route
#2 of 2
route average 79% on time
Key facts
- United Airlines flights on IAH to SEA arrived on time 78% of the time in Aug 2025 – Jul 2026.
- 0.2% were cancelled, and 7% arrived an hour or more late.
- That ranks #2 of 2 airlines on this route, which averaged 79% on time overall.
- The largest source of delay minutes was late-arriving aircraft (36%).
On-time trend by month
Why this airline's flights were late
- Late-arriving aircraft36%
- Airline (crew, maintenance, cleaning, fueling)35%
- Air traffic control & airport congestion24%
- Extreme weather6%
- Security0%
Other airlines on IAH to SEA
- Alaska Airlines80% on time · 11 min avg delay
Full IAH to SEA comparison →
United Airlines on-time record across all routes →
1,238 United Airlines flights tracked on this route; 3 cancelled, 2 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.