Delta Air Lines SLC to SEA on-time performance
Delta Air Lines nonstop flights from Salt Lake City to Seattle · Aug 2025 – Jul 2026
On-time arrivals
83%
arrived < 15 min late
Cancelled
0.5%
12 flights
Avg arrival delay
10 min
53 min when late
Rank on route
#1 of 4
route average 80% on time
Key facts
- Delta Air Lines flights on SLC to SEA arrived on time 83% of the time in Aug 2025 – Jul 2026.
- 0.5% were cancelled, and 5% arrived an hour or more late.
- That ranks #1 of 4 airlines on this route, which averaged 80% on time overall.
- The largest source of delay minutes was airline (crew, maintenance, cleaning, fueling) (47%).
On-time trend by month
Why this airline's flights were late
- Airline (crew, maintenance, cleaning, fueling)47%
- Late-arriving aircraft30%
- Air traffic control & airport congestion19%
- Extreme weather4%
- Security0%
Other airlines on SLC to SEA
- Alaska Airlines77% on time · 12 min avg delay
- SkyWest Airlines77% on time · 18 min avg delay
- Frontier Airlines68% on time · 21 min avg delay
Full SLC to SEA comparison →
Delta Air Lines on-time record across all routes →
2,230 Delta Air Lines flights tracked on this route; 12 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.