Flight Reliability
DL 1518 · Delta Air Lines
Atlanta → Raleigh–Durham (ATL–RDU)
77
Usually Fine
WanderNerd Reliability Score
- 74%
- Arrive within 15 minutes
- 11 min
- Average arrival delay
- 1.2%
- Cancelled
- 5 min early
- Median arrival delay
Based on 339 historical flights. Data through May 2026.
What the data says
Saturdays have been rough.
DL 1518 arrived on time 85% of the time on Wednesdays and just 64% on Saturdays. That gap is worth planning around.
A bit behind the ATL–RDU route.
DL 1518 arrived on time 74% of the time, versus 80% across the ATL–RDU route.
Lagging the Delta Air Lines network.
DL 1518 arrived on time 74% of the time, versus 81% across the Delta Air Lines network.
Recent months have been rougher.
DL 1518 arrived on time 73% of the time over the last three months in the data, compared with 80% in the three months before that.
The breakdown
- Mon72%(50 flights)
- Tue75%(47 flights)
- Wed85%(47 flights)
- Thu78%(49 flights)
- Fri71%(48 flights)
- Sat64%(45 flights)
- Sun74%(49 flights)
68%
May
Jun 50% → May 68% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 50% | 30 |
| July 2025 | 67% | 30 |
| August 2025 | 61% | 31 |
| September 2025 | 90% | 30 |
| October 2025 | 89% | 18 |
| November 2025 | 82% | 17 |
| December 2025 | 83% | 30 |
| January 2026 | 76% | 29 |
| February 2026 | 82% | 28 |
| March 2026 | 74% | 31 |
| April 2026 | 77% | 30 |
| May 2026 | 68% | 31 |
- Departures on time
- 75%
- Diverted
- 0%
- Flights flown
- 335
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 339 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.