Route Reliability
San Diego → Denver
SAN–DEN · 853 miles · San Diego International Airport to Denver International Airport
- 79%
- Arrive within 15 minutes
- 5 min
- Average arrival delay
- 0.9%
- Cancelled
- 5,880
- Flights in the data
Data through May 2026.
Who flies it best
Ranked by on-time arrivals. Historical results, not predictions.
- 1.United Airlines85%2,090 flights
- 2.Alaska Airlines82%685 flights
- 3.Frontier Airlines81%718 flights
- 4.Southwest Airlines74%2,387 flights
What the data says
Morning flights do better here.
SAN–DEN flights departing between 6–9 AM arrived on time 89% of the time, versus 64% between 3–6 PM.
Friday is doing you no favors.
SAN–DEN flights arrived on time 87% of the time on Saturdays. On Fridays: 74%.
United Airlines runs this route best.
United Airlines arrived on time 85% of the time on this route; Southwest Airlines managed 74%.
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
- Mon80%(883 flights)
- Tue82%(763 flights)
- Wed82%(784 flights)
- Thu75%(866 flights)
- Fri74%(884 flights)
- Sat87%(730 flights)
- Sun79%(896 flights)
- 6–9 AM89%(1772 flights)
- 9 AM–12 PM87%(1042 flights)
- 12–3 PM72%(1056 flights)
- 3–6 PM64%(943 flights)
- 6–9 PM77%(908 flights)
- 9 PM–12 AM86%(85 flights)
Jun 65% → May 83% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 65% | 450 |
| July 2025 | 70% | 448 |
| August 2025 | 73% | 431 |
| September 2025 | 78% | 407 |
| October 2025 | 81% | 528 |
| November 2025 | 84% | 515 |
| December 2025 | 74% | 526 |
| January 2026 | 87% | 494 |
| February 2026 | 85% | 458 |
| March 2026 | 83% | 531 |
| April 2026 | 87% | 505 |
| May 2026 | 83% | 513 |
Keep nerding
Based on 5,880 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.