Southwest Airlines DEN to SEA on-time performance
Southwest Airlines nonstop flights from Denver to Seattle · Aug 2025 – Jul 2026
On-time arrivals
61%
arrived < 15 min late
Cancelled
0.2%
3 flights
Avg arrival delay
20 min
46 min when late
Rank on route
#6 of 6
route average 75% on time
Key facts
- Southwest Airlines flights on DEN to SEA arrived on time 61% of the time in Aug 2025 – Jul 2026.
- 0.2% were cancelled, and 9% arrived an hour or more late.
- That ranks #6 of 6 airlines on this route, which averaged 75% on time overall.
- The largest source of delay minutes was late-arriving aircraft (46%).
On-time trend by month
Why this airline's flights were late
- Late-arriving aircraft46%
- Airline (crew, maintenance, cleaning, fueling)35%
- Air traffic control & airport congestion18%
- 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
- 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 →
Southwest Airlines on-time record across all routes →
1,341 Southwest Airlines flights tracked on this route; 3 cancelled, 1 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.