Flight Reliability
DL 4133 · Delta Air Lines
Aspen → Los Angeles (ASE–LAX)
59
A Little Dicey
WanderNerd Reliability Score
- 72%
- Arrive within 15 minutes
- 17 min
- Average arrival delay
- 4.5%
- Cancelled
- 7 min early
- Median arrival delay
Based on 334 historical flights. Data through May 2026.
What the data says
Sunday scaries are real for this one.
DL 4133 arrived on time 84% of the time on Thursdays and just 62% on Sundays. That gap is worth planning around.
Lagging the Delta Air Lines network.
DL 4133 arrived on time 72% of the time, versus 81% across the Delta Air Lines network.
Keep a backup plan handy.
DL 4133 was cancelled 4.5% of the time. Typical for U.S. flights is around 1–2%.
Trending in the right direction.
DL 4133 arrived on time 86% of the time over the last three months in the data, compared with 61% in the three months before that.
The breakdown
- Mon63%(46 flights)
- Tue77%(43 flights)
- Wed83%(48 flights)
- Thu84%(45 flights)
- Fri75%(44 flights)
- Sat63%(48 flights)
- Sun62%(45 flights)
100%
May
Jun 68% → May 100% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 68% | 25 |
| July 2025 | 79% | 28 |
| August 2025 | 67% | 30 |
| September 2025 | 77% | 30 |
| October 2025 | 71% | 31 |
| November 2025 | 86% | 29 |
| December 2025 | 55% | 29 |
| January 2026 | 71% | 31 |
| February 2026 | 56% | 25 |
| March 2026 | 73% | 30 |
| April 2026 | 86% | 21 |
| May 2026 | 100% | 10 |
- Departures on time
- 73%
- Diverted
- 0%
- Flights flown
- 319
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 334 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.