Flight Reliability
DL 921 · Delta Air Lines
Atlanta → Dallas–Fort Worth (ATL–DFW)84% of its flights flew this route. The rest (DFW–ATL) are included in these numbers.
73
Usually Fine
WanderNerd Reliability Score
- 73%
- Arrive within 15 minutes
- 16 min
- Average arrival delay
- 0.7%
- Cancelled
- 3 min early
- Median arrival delay
Based on 431 historical flights. Data through May 2026.
What the data says
The 12–3 PM departure wins.
DL 921 departing between 12–3 PM arrived on time 76% of the time, versus 59% between 3–6 PM.
Wednesdays have been rough.
DL 921 arrived on time 84% of the time on Thursdays and just 62% on Wednesdays. That gap is worth planning around.
Lagging the Delta Air Lines network.
DL 921 arrived on time 73% of the time, versus 81% across the Delta Air Lines network.
The breakdown
- Mon74%(61 flights)
- Tue72%(61 flights)
- Wed62%(60 flights)
- Thu84%(61 flights)
- Fri77%(60 flights)
- Sat76%(62 flights)
- Sun66%(61 flights)
- 12–3 PM76%(335 flights)
- 3–6 PM59%(73 flights)
- 6–9 PM67%(18 flights)
67%
May
Jun 53% → May 67% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 53% | 51 |
| July 2025 | 65% | 62 |
| August 2025 | 76% | 41 |
| September 2025 | 87% | 30 |
| October 2025 | 90% | 31 |
| November 2025 | 73% | 30 |
| December 2025 | 70% | 30 |
| January 2026 | 75% | 28 |
| February 2026 | 77% | 31 |
| March 2026 | 75% | 32 |
| April 2026 | 87% | 30 |
| May 2026 | 67% | 30 |
- Departures on time
- 74%
- Diverted
- 0.5%
- Flights flown
- 426
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 431 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.