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Showing Delta only (incl. its regional partners)All airlines ×
1,415 nonstop flights · Aug 2025 – Jul 2026 · US DOT on-time records, all US airlines

Leave before 9 am: 9 in 10 depart on time. After 4 pm it’s 73%.

Best time to leave 10–11 am 92% arrive on time from BUF
Best single flight DL 5223 BUF 10:25 → JFK 11:52 · 88% on time Avoid DL 5250 BUF 20:09 → JFK 21:49 · 78% on time

Time of day × airport

Share of this route’s flights leaving within 15 minutes, by airport and scheduled departure hour, over Aug 2025 – Jul 2026. Blank: no flights then (or fewer than 40 in the year).

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% of this route’s flights leaving within 15 min (small number: flights in the Jun 6 – Jul 31, 2026 schedule): 85+75–8465–7455–64under 55

Pick an hour to see this route’s flights leaving then.

Flights, best and worst

Flights in the Jun 6 – Jul 31, 2026 schedule that ran 150+ times in the year. Times are local. Pick a flight for its history.

DL 5223flown by Endeavor BUF 10:25 JFK 11:52 88%
DL 5284flown by Endeavor BUF 07:00 JFK 08:30 86%
DL 5296flown by Endeavor BUF 15:50 JFK 17:30 80%
DL 5250flown by Endeavor BUF 20:09 JFK 21:49 78%

All 5 Delta flights in the current schedule

Every flight that flew in the Jun 6 – Jul 31, 2026 schedule, with its record over Aug 2025 – Jul 2026. Times are local. Click a column to sort.

DL 5284flown by Endeavor BUF 07:00 JFK 08:30 1h 30m 360 86% 3.9% 78 min
DL 5426flown by Endeavor BUF 10:00 JFK 11:24 1h 24m 110 90% 2.7% 68 min
DL 5223flown by Endeavor BUF 10:25 JFK 11:52 1h 27m 234 88% 2.6% 66 min
DL 5296flown by Endeavor BUF 15:50 JFK 17:30 1h 41m 189 80% 11.1% 97 min
DL 5250flown by Endeavor BUF 20:09 JFK 21:49 1h 40m 346 78% 9.5% 80 min

Nonstops by airline and airport

Arriving within 15 minutes, Aug 2025 – Jul 2026. Pick a row to see that airline’s flights on that airport pair.

Delta BUF JFK 1h 38m 83% 6.0% 1,415 Flying now
Flying on a particular day? Pick a date above and the same ranking uses our forecast odds for each flight that day: Tomorrow.

About this data: US DOT on-time records, Aug 2025 – Jul 2026, all US airlines; regional flights count under the airline that sells them. Schedules (which flights and connections exist, and their times) are as of Jun 6 – Jul 31, 2026; seasonal flights outside that window aren’t ranked. Rebuilt monthly. JSON