Flight Reliability
DL 4956 · Delta Air Lines
New York → Raleigh–Durham (LGA–RDU)84% of its flights flew this route. The rest (RDU–LGA, SYR–MSP) are included in these numbers.
- 71%
- Arrive within 15 minutes
- 14 min
- Average arrival delay
- 9.3%
- Cancelled
- 9 min early
- Median arrival delay
Based on 355 historical flights. Data through May 2026.
What the data says
Thursdays have been rough.
DL 4956 arrived on time 88% of the time on Saturdays and just 58% on Thursdays. That gap is worth planning around.
Lagging the Delta Air Lines network.
DL 4956 arrived on time 71% of the time, versus 81% across the Delta Air Lines network.
Keep a backup plan handy.
DL 4956 was cancelled 9.3% of the time. Typical for U.S. flights is around 1–2%.
Slipping a little lately.
DL 4956 arrived on time 68% of the time over the last three months in the data, compared with 73% in the three months before that.
The breakdown
- Mon69%(48 flights)
- Tue79%(52 flights)
- Wed71%(51 flights)
- Thu58%(45 flights)
- Fri75%(52 flights)
- Sat88%(24 flights)
- Sun62%(50 flights)
- 6–9 AM70%(64 flights)
- 9 AM–12 PM—(8 flights)
- 6–9 PM70%(250 flights)
Jun 62% → May 71% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 62% | 26 |
| July 2025 | 68% | 28 |
| August 2025 | 83% | 30 |
| September 2025 | 85% | 26 |
| October 2025 | 60% | 25 |
| November 2025 | 63% | 24 |
| December 2025 | 50% | 24 |
| January 2026 | 91% | 23 |
| February 2026 | 77% | 22 |
| March 2026 | 64% | 22 |
| April 2026 | 71% | 24 |
| May 2026 | 71% | 48 |
- Departures on time
- 73%
- Diverted
- 0%
- Flights flown
- 322
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 355 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.