Route Reliability
Seattle → San Diego
SEA–SAN · 1,050 miles · Seattle–Tacoma International Airport to San Diego International Airport
- 79%
- Arrive within 15 minutes
- 4 min
- Average arrival delay
- 1.2%
- Cancelled
- 4,576
- Flights in the data
Data through May 2026.
Who flies it best
Ranked by on-time arrivals. Historical results, not predictions.
- 1.Delta Air Lines83%1,698 flights
- 2.Alaska Airlines77%2,790 flights
Not enough history to rank: Southwest Airlines (88 flights). We rank airlines only after 100 flights on the route.
What the data says
Morning flights do better here.
SEA–SAN flights departing between 6–9 AM arrived on time 91% of the time, versus 72% between 3–6 PM.
Sunday scaries are real for this one.
SEA–SAN flights arrived on time 83% of the time on Tuesdays. On Sundays: 73%.
Delta Air Lines has a slight edge here.
Delta Air Lines arrived on time 83% of the time on this route; Alaska Airlines managed 77%.
Ticking up lately.
SEA–SAN flights arrived on time 83% of the time over the last three months in the data, compared with 78% in the three months before that.
Best historical flights
Ranked by on-time arrivals, minimum 100 flights. Past performance, not a promise.
Top flights by on-time rate
More flights on this route
The breakdown
- Mon79%(689 flights)
- Tue83%(636 flights)
- Wed82%(626 flights)
- Thu78%(665 flights)
- Fri76%(657 flights)
- Sat81%(549 flights)
- Sun73%(681 flights)
- 6–9 AM91%(739 flights)
- 9 AM–12 PM78%(1309 flights)
- 12–3 PM80%(565 flights)
- 3–6 PM72%(828 flights)
- 6–9 PM74%(940 flights)
- 9 PM–12 AM83%(122 flights)
Jun 78% → May 84% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 78% | 424 |
| July 2025 | 77% | 433 |
| August 2025 | 74% | 419 |
| September 2025 | 83% | 377 |
| October 2025 | 76% | 337 |
| November 2025 | 73% | 316 |
| December 2025 | 70% | 349 |
| January 2026 | 81% | 330 |
| February 2026 | 83% | 305 |
| March 2026 | 77% | 381 |
| April 2026 | 89% | 409 |
| May 2026 | 84% | 423 |
Same trip, other airports
Keep nerding
Based on 4,576 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.