Flight Reliability
DL 3247 · Delta Air Lines
Atlanta → Raleigh–Durham (ATL–RDU)99% of its flights flew this route. The rest (RDU–ATL) are included in these numbers.
- 71%
- Arrive within 15 minutes
- 17 min
- Average arrival delay
- 0.6%
- Cancelled
- 2 min
- Median arrival delay
Based on 164 historical flights. Data through May 2026.
What the data says
Thursdays have been rough.
DL 3247 arrived on time 90% of the time on Saturdays and just 56% on Thursdays. That gap is worth planning around.
Lagging the ATL–RDU route.
DL 3247 arrived on time 71% of the time, versus 80% across the ATL–RDU route.
Lagging the Delta Air Lines network.
DL 3247 arrived on time 71% of the time, versus 81% across the Delta Air Lines network.
Ticking up lately.
DL 3247 arrived on time 77% of the time over the last three months in the data, compared with 71% in the three months before that.
The breakdown
- Mon62%(26 flights)
- Tue65%(20 flights)
- Wed80%(20 flights)
- Thu56%(25 flights)
- Fri77%(26 flights)
- Sat90%(19 flights)
- Sun70%(27 flights)
- 6–9 AM—(1 flights)
- 3–6 PM—(1 flights)
- 6–9 PM—(1 flights)
- 9 PM–12 AM70%(160 flights)
Jun 50% → Dec 68% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 50% | 22 |
| July 2025 | 61% | 31 |
| August 2025 | 75% | 20 |
| September 2025 | 77% | 13 |
| October 2025 | 86% | 29 |
| November 2025 | 76% | 29 |
| December 2025 | 68% | 19 |
- Departures on time
- 76%
- Diverted
- 0%
- Flights flown
- 163
- Months covered
- 7
Same route, other flights
Keep nerding
Based on 164 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.