Delta Air Lines DEN to SEA on-time performance
Delta Air Lines nonstop flights from Denver to Seattle · Aug 2025 – Jul 2026
On-time arrivals
79%
arrived < 15 min late
Cancelled
0.9%
8 flights
Avg arrival delay
19 min
86 min when late
Rank on route
#3 of 6
route average 75% on time
Key facts
- Delta Air Lines flights on DEN to SEA arrived on time 79% of the time in Aug 2025 – Jul 2026.
- 0.9% were cancelled, and 7% arrived an hour or more late.
- That ranks #3 of 6 airlines on this route, which averaged 75% 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%
- Airline (crew, maintenance, cleaning, fueling)42%
- Air traffic control & airport congestion10%
- Extreme weather1%
- Security0%
Other airlines on DEN to SEA
- United Airlines81% on time · 12 min avg delay
- Alaska Airlines75% on time · 15 min avg delay
- Southwest Airlines61% on time · 20 min avg delay
- Frontier Airlines80% on time · 12 min avg delay
- SkyWest Airlines76% on time · 18 min avg delay
Full DEN to SEA comparison →
Delta Air Lines on-time record across all routes →
868 Delta Air Lines flights tracked on this route; 8 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.