Flight Reliability
DL 4715 · Delta Air Lines
St. Louis → New York (STL–LGA)82% of its flights flew this route. The rest (JFK–STL) are included in these numbers.
- 76%
- Arrive within 15 minutes
- 4 min
- Average arrival delay
- 2.2%
- Cancelled
- 11 min early
- Median arrival delay
Based on 229 historical flights. Data through May 2026.
What the data says
The 12–3 PM departure wins.
DL 4715 departing between 12–3 PM arrived on time 84% of the time, versus 75% between 3–6 PM.
Friday is doing you no favors.
DL 4715 arrived on time 82% of the time on Saturdays and just 66% on Fridays. That gap is worth planning around.
A bit behind the Delta Air Lines network.
DL 4715 arrived on time 76% of the time, versus 81% across the Delta Air Lines network.
Recent months have been rougher.
DL 4715 arrived on time 68% of the time over the last three months in the data, compared with 85% in the three months before that.
The breakdown
- Mon78%(32 flights)
- Tue81%(32 flights)
- Wed75%(32 flights)
- Thu79%(33 flights)
- Fri66%(32 flights)
- Sat82%(28 flights)
- Sun74%(35 flights)
- 9 AM–12 PM76%(185 flights)
- 12–3 PM84%(19 flights)
- 3–6 PM75%(20 flights)
Jun 77% → May 79% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 77% | 22 |
| July 2025 | 73% | 30 |
| August 2025 | 84% | 31 |
| September 2025 | 87% | 30 |
| October 2025 | 83% | 30 |
| November 2025 | 68% | 25 |
| December 2025 | 57% | 28 |
| May 2026 | 79% | 24 |
- Departures on time
- 76%
- Diverted
- 0%
- Flights flown
- 224
- Months covered
- 9
Same route, other flights
Keep nerding
Based on 229 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.