Flight Reliability
DL 4011 · Delta Air Lines
Atlanta → Aspen (ATL–ASE)
49
Bring Snacks
WanderNerd Reliability Score
- 77%
- Arrive within 15 minutes
- 14 min
- Average arrival delay
- 1.5%
- Cancelled
- 2 min early
- Median arrival delay
Based on 335 historical flights. Data through May 2026.
What the data says
Skip Saturday if you can.
DL 4011 arrived on time 83% of the time on Wednesdays. On Saturdays: 70%.
A bit behind the Delta Air Lines network.
DL 4011 arrived on time 77% of the time, versus 81% across the Delta Air Lines network.
Trending in the right direction.
DL 4011 arrived on time 89% of the time over the last three months in the data, compared with 63% in the three months before that.
The breakdown
- Mon77%(43 flights)
- Tue81%(43 flights)
- Wed83%(47 flights)
- Thu78%(45 flights)
- Fri76%(42 flights)
- Sat70%(43 flights)
- Sun73%(44 flights)
100%
May
Jun 77% → May 100% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 77% | 22 |
| July 2025 | 78% | 27 |
| August 2025 | 77% | 30 |
| September 2025 | 90% | 30 |
| October 2025 | 72% | 29 |
| November 2025 | 86% | 28 |
| December 2025 | 69% | 29 |
| January 2026 | 67% | 27 |
| February 2026 | 52% | 25 |
| March 2026 | 83% | 30 |
| April 2026 | 85% | 20 |
| May 2026 | 100% | 10 |
- Departures on time
- 81%
- Diverted
- 6.9%
- Flights flown
- 307
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 335 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.