Flight Reliability
DL 3240 · Delta Air Lines
Raleigh–Durham → Atlanta (RDU–ATL)
92
Nerd Approved
WanderNerd Reliability Score
- 92%
- Arrive within 15 minutes
- 6 min early
- Average arrival delay
- 2.1%
- Cancelled
- 10 min early
- Median arrival delay
Based on 190 historical flights. Data through May 2026.
What the data says
Friday comes out ahead.
A small edge: 96% on time on Fridays against 89% on Thursdays.
A bit ahead of the RDU–ATL route.
DL 3240 arrived on time 92% of the time, versus 87% across the RDU–ATL route.
Better than the Delta Air Lines network average.
DL 3240 arrived on time 92% of the time, versus 81% across the Delta Air Lines network.
Slipping a little lately.
DL 3240 arrived on time 88% of the time over the last three months in the data, compared with 92% in the three months before that.
The breakdown
- Mon93%(27 flights)
- Tue93%(28 flights)
- Wed89%(28 flights)
- Thu89%(28 flights)
- Fri96%(26 flights)
- Sat91%(22 flights)
- Sun93%(27 flights)
77%
Dec
Jun 100% → Dec 77% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 100% | 22 |
| July 2025 | 84% | 31 |
| August 2025 | 97% | 31 |
| September 2025 | 96% | 27 |
| October 2025 | 90% | 30 |
| November 2025 | 96% | 28 |
| December 2025 | 77% | 17 |
- Departures on time
- 95%
- Diverted
- 0%
- Flights flown
- 186
- Months covered
- 7
Same route, other flights
Keep nerding
Based on 190 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.