Route Reliability
Denver → San Diego
DEN–SAN · 853 miles · Denver International Airport to San Diego International Airport
- 76%
- Arrive within 15 minutes
- 7 min
- Average arrival delay
- 0.7%
- Cancelled
- 5,882
- Flights in the data
Data through May 2026.
Who flies it best
Ranked by on-time arrivals. Historical results, not predictions.
- 1.Alaska Airlines82%686 flights
- 2.United Airlines80%2,090 flights
- 3.Frontier Airlines79%717 flights
- 4.Southwest Airlines71%2,389 flights
What the data says
Morning flights do better here.
DEN–SAN flights departing between 3–6 AM arrived on time 95% of the time, versus 63% between 6–9 PM.
Thursday is the weak spot.
DEN–SAN flights arrived on time 82% of the time on Saturdays. On Thursdays: 70%.
Alaska Airlines runs this route best.
Alaska Airlines arrived on time 82% of the time on this route; Southwest Airlines managed 71%.
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
- Mon78%(882 flights)
- Tue80%(765 flights)
- Wed79%(790 flights)
- Thu70%(864 flights)
- Fri75%(894 flights)
- Sat82%(734 flights)
- Sun73%(898 flights)
- 3–6 AM95%(63 flights)
- 6–9 AM90%(1228 flights)
- 9 AM–12 PM80%(891 flights)
- 12–3 PM82%(898 flights)
- 3–6 PM72%(823 flights)
- 6–9 PM63%(1295 flights)
- 9 PM–12 AM67%(629 flights)
Jun 66% → May 79% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 66% | 456 |
| July 2025 | 66% | 453 |
| August 2025 | 71% | 434 |
| September 2025 | 74% | 407 |
| October 2025 | 74% | 526 |
| November 2025 | 80% | 516 |
| December 2025 | 71% | 532 |
| January 2026 | 83% | 493 |
| February 2026 | 84% | 460 |
| March 2026 | 83% | 529 |
| April 2026 | 84% | 507 |
| May 2026 | 79% | 514 |
Keep nerding
Based on 5,882 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.