Delta Air Lines SEA to SAN on-time performance
Delta Air Lines nonstop flights from Seattle to San Diego · Aug 2025 – Jul 2026
On-time arrivals
82%
arrived < 15 min late
Cancelled
1.0%
17 flights
Avg arrival delay
11 min
53 min when late
Rank on route
#2 of 4
route average 76% on time
Key facts
- Delta Air Lines flights on SEA to SAN arrived on time 82% of the time in Aug 2025 – Jul 2026.
- 1% were cancelled, and 5% arrived an hour or more late.
- That ranks #2 of 4 airlines on this route, which averaged 76% on time overall.
- The largest source of delay minutes was airline (crew, maintenance, cleaning, fueling) (46%).
On-time trend by month
Why this airline's flights were late
- Airline (crew, maintenance, cleaning, fueling)46%
- Air traffic control & airport congestion30%
- Late-arriving aircraft20%
- Extreme weather4%
- Security0%
Other airlines on SEA to SAN
- Alaska Airlines74% on time · 13 min avg delay
- Southwest Airlines52% on time · 23 min avg delay
- SkyWest Airlines100% on time · 0 min avg delay
Full SEA to SAN comparison →
Delta Air Lines on-time record across all routes →
1,704 Delta Air Lines flights tracked on this route; 17 cancelled, 10 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.