United Airlines DEN to SEA on-time performance
United Airlines nonstop flights from Denver to Seattle · Aug 2025 – Jul 2026
On-time arrivals
81%
arrived < 15 min late
Cancelled
0.5%
10 flights
Avg arrival delay
12 min
56 min when late
Rank on route
#1 of 6
route average 75% on time
Key facts
- United Airlines flights on DEN to SEA arrived on time 81% of the time in Aug 2025 – Jul 2026.
- 0.5% were cancelled, and 6% arrived an hour or more late.
- That ranks #1 of 6 airlines on this route, which averaged 75% on time overall.
- The largest source of delay minutes was late-arriving aircraft (41%).
On-time trend by month
Why this airline's flights were late
- Late-arriving aircraft41%
- Airline (crew, maintenance, cleaning, fueling)34%
- Air traffic control & airport congestion24%
- Extreme weather2%
- Security0%
Other airlines on DEN to SEA
- Alaska Airlines75% on time · 15 min avg delay
- Southwest Airlines61% on time · 20 min avg delay
- Delta Air Lines79% on time · 19 min avg delay
- Frontier Airlines80% on time · 12 min avg delay
- SkyWest Airlines76% on time · 18 min avg delay
Full DEN to SEA comparison →
United Airlines on-time record across all routes →
1,906 United Airlines flights tracked on this route; 10 cancelled, 0 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.