Flight Reliability
DL 2549 · Delta Air Lines
Atlanta → Washington (ATL–IAD)
59
A Little Dicey
WanderNerd Reliability Score
- 73%
- Arrive within 15 minutes
- 24 min
- Average arrival delay
- 3.6%
- Cancelled
- 1 min early
- Median arrival delay
Based on 329 historical flights. Data through May 2026.
What the data says
Sunday scaries are real for this one.
DL 2549 arrived on time 78% of the time on Wednesdays. On Sundays: 64%.
A bit behind the ATL–IAD route.
DL 2549 arrived on time 73% of the time, versus 77% across the ATL–IAD route.
Lagging the Delta Air Lines network.
DL 2549 arrived on time 73% of the time, versus 81% across the Delta Air Lines network.
Keep a backup plan handy.
DL 2549 was cancelled 3.6% of the time. Typical for U.S. flights is around 1–2%.
The breakdown
- Mon74%(49 flights)
- Tue68%(47 flights)
- Wed78%(45 flights)
- Thu78%(45 flights)
- Fri72%(43 flights)
- Sat77%(43 flights)
- Sun64%(45 flights)
84%
May
Jun 59% → May 84% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 59% | 27 |
| July 2025 | 57% | 28 |
| August 2025 | 74% | 31 |
| September 2025 | 86% | 29 |
| October 2025 | 72% | 18 |
| November 2025 | 63% | 16 |
| December 2025 | 77% | 22 |
| January 2026 | 66% | 29 |
| February 2026 | 78% | 27 |
| March 2026 | 69% | 29 |
| April 2026 | 83% | 30 |
| May 2026 | 84% | 31 |
- Departures on time
- 75%
- Diverted
- 0%
- Flights flown
- 317
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 329 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.