Delta Air Lines SEA to SLC on-time performance
Delta Air Lines nonstop flights from Seattle to Salt Lake City · Aug 2025 – Jul 2026
On-time arrivals
87%
arrived < 15 min late
Cancelled
0.5%
12 flights
Avg arrival delay
9 min
58 min when late
Rank on route
#1 of 4
route average 84% on time
Key facts
- Delta Air Lines flights on SEA to SLC arrived on time 87% of the time in Aug 2025 – Jul 2026.
- 0.5% were cancelled, and 4% arrived an hour or more late.
- That ranks #1 of 4 airlines on this route, which averaged 84% on time overall.
- The largest source of delay minutes was airline (crew, maintenance, cleaning, fueling) (61%).
On-time trend by month
Why this airline's flights were late
- Airline (crew, maintenance, cleaning, fueling)61%
- Late-arriving aircraft26%
- Air traffic control & airport congestion10%
- Extreme weather3%
- Security0%
Other airlines on SEA to SLC
- Alaska Airlines80% on time · 10 min avg delay
- SkyWest Airlines80% on time · 10 min avg delay
- Frontier Airlines74% on time · 16 min avg delay
Full SEA to SLC comparison →
Delta Air Lines on-time record across all routes →
2,227 Delta Air Lines flights tracked on this route; 12 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.