Flight Reliability
DL 4818 · Delta Air Lines
Buffalo → New York (BUF–JFK)86% of its flights flew this route. The rest (ATL–GSO, GSO–ATL) are included in these numbers.
- 76%
- Arrive within 15 minutes
- 13 min
- Average arrival delay
- 7.7%
- Cancelled
- 9 min early
- Median arrival delay
Based on 221 historical flights. Data through May 2026.
What the data says
The late departure is the smart one here.
DL 4818 departing between 6–9 PM arrived on time 92% of the time, versus 75% between 3–6 PM.
Mondays have been rough.
DL 4818 arrived on time 84% of the time on Fridays and just 68% on Mondays. That gap is worth planning around.
A bit behind the BUF–JFK route.
DL 4818 arrived on time 76% of the time, versus 81% across the BUF–JFK route.
A bit behind the Delta Air Lines network.
DL 4818 arrived on time 76% of the time, versus 81% across the Delta Air Lines network.
The breakdown
- Mon68%(31 flights)
- Tue80%(30 flights)
- Wed75%(28 flights)
- Thu80%(25 flights)
- Fri84%(31 flights)
- Sat73%(26 flights)
- Sun73%(33 flights)
- 12–3 PM—(1 flights)
- 3–6 PM75%(191 flights)
- 6–9 PM92%(12 flights)
Jun 59% → Dec 71% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 59% | 27 |
| July 2025 | 65% | 20 |
| August 2025 | 76% | 29 |
| September 2025 | 86% | 29 |
| October 2025 | 83% | 30 |
| November 2025 | 82% | 28 |
| December 2025 | 71% | 35 |
- Departures on time
- 74%
- Diverted
- 0%
- Flights flown
- 204
- Months covered
- 8
Same route, other flights
Keep nerding
Based on 221 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.