Flight Reliability
AS 1491 · Alaska Airlines
Denver → San Diego (DEN–SAN)99% of its flights flew this route. The rest (RDM–SEA) are included in these numbers.
91
Nerd Approved
WanderNerd Reliability Score
- 90%
- Arrive within 15 minutes
- 6 min early
- Average arrival delay
- 1.9%
- Cancelled
- 18 min early
- Median arrival delay
Based on 154 historical flights. Data through May 2026.
What the data says
Sunday scaries are real for this one.
AS 1491 arrived on time 96% of the time on Thursdays. On Sundays: 86%.
Better than the DEN–SAN route average.
AS 1491 arrived on time 90% of the time, versus 76% across the DEN–SAN route.
Better than the Alaska Airlines network average.
AS 1491 arrived on time 90% of the time, versus 80% across the Alaska Airlines network.
The breakdown
- Mon87%(23 flights)
- Tue87%(23 flights)
- Wed95%(20 flights)
- Thu96%(22 flights)
- Fri91%(21 flights)
- Sat90%(20 flights)
- Sun86%(22 flights)
100%
May
Nov 84% → May 100% on time
| Month | On-time percentage | Flights |
|---|---|---|
| November 2025 | 84% | 19 |
| January 2026 | 96% | 27 |
| February 2026 | 89% | 28 |
| March 2026 | 73% | 30 |
| April 2026 | 100% | 30 |
| May 2026 | 100% | 12 |
- Departures on time
- 85%
- Diverted
- 0%
- Flights flown
- 151
- Months covered
- 7
Same route, other flights
Keep nerding
Based on 154 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.