Flight Reliability
DL 1199 · Delta Air Lines
Atlanta → Chicago (ATL–ORD)
62
A Little Dicey
WanderNerd Reliability Score
- 71%
- Arrive within 15 minutes
- 16 min
- Average arrival delay
- 2.5%
- Cancelled
- 2 min early
- Median arrival delay
Based on 315 historical flights. Data through May 2026.
What the data says
Friday is doing you no favors.
DL 1199 arrived on time 76% of the time on Tuesdays. On Fridays: 65%.
Lagging the Delta Air Lines network.
DL 1199 arrived on time 71% of the time, versus 81% across the Delta Air Lines network.
Ticking up lately.
DL 1199 arrived on time 74% of the time over the last three months in the data, compared with 70% in the three months before that.
The breakdown
- Mon72%(47 flights)
- Tue76%(38 flights)
- Wed68%(38 flights)
- Thu71%(48 flights)
- Fri65%(46 flights)
- Sat74%(39 flights)
- Sun69%(48 flights)
84%
May
Jun 62% → May 84% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 62% | 29 |
| July 2025 | 65% | 31 |
| August 2025 | 78% | 18 |
| September 2025 | 92% | 13 |
| October 2025 | 72% | 29 |
| November 2025 | 52% | 21 |
| December 2025 | 58% | 19 |
| January 2026 | 77% | 31 |
| February 2026 | 75% | 28 |
| March 2026 | 68% | 28 |
| April 2026 | 69% | 26 |
| May 2026 | 84% | 31 |
- Departures on time
- 74%
- Diverted
- 1.0%
- Flights flown
- 304
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 315 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.