Flight Reliability
DL 1228 · Delta Air Lines
Detroit → Atlanta (DTW–ATL)100% of its flights flew this route. The rest (LAS–SEA) are included in these numbers.
84
Pretty Reliable
WanderNerd Reliability Score
- 81%
- Arrive within 15 minutes
- 8 min
- Average arrival delay
- 1.1%
- Cancelled
- 5 min early
- Median arrival delay
Based on 365 historical flights. Data through May 2026.
What the data says
The 12–3 PM departure wins.
DL 1228 departing between 12–3 PM arrived on time 83% of the time, versus 74% between 3–6 PM.
Friday is doing you no favors.
DL 1228 arrived on time 89% of the time on Thursdays. On Fridays: 75%.
The breakdown
- Mon80%(51 flights)
- Tue79%(52 flights)
- Wed81%(52 flights)
- Thu89%(52 flights)
- Fri75%(52 flights)
- Sat82%(51 flights)
- Sun78%(51 flights)
- 12–3 PM83%(284 flights)
- 3–6 PM74%(76 flights)
- 6–9 PM—(1 flights)
71%
May
Jun 73% → May 71% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 73% | 30 |
| July 2025 | 77% | 31 |
| August 2025 | 94% | 31 |
| September 2025 | 97% | 30 |
| October 2025 | 90% | 31 |
| November 2025 | 86% | 29 |
| December 2025 | 60% | 30 |
| January 2026 | 69% | 29 |
| February 2026 | 93% | 28 |
| March 2026 | 71% | 31 |
| April 2026 | 87% | 30 |
| May 2026 | 71% | 31 |
- Departures on time
- 78%
- Diverted
- 0%
- Flights flown
- 361
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 365 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.