1,083 nonstop flights · Aug 2025 – Jul 2026 · US DOT on-time records, all US airlines

No clear winner: Delta’s ATL → MDT flights land within a few points of 82% on time whatever the hour.

Best time to leave 9–10 am 88% arrive on time from ATL

Best single flight DL 1248 ATL 09:19 → MDT 11:11 · 88% on time Avoid DL 1283 ATL 21:59 → MDT 23:55 · 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).

ATL

% 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

Harrisburg flights leaving ATL 9–10 pm: 1Close ×


DL 1283	ATL 21:59	MDT 23:55	1h 56m	208	78%	3.4%	88 min

Airlines on this route

Arriving within 15 minutes. Regional flights count under the airline that sells them. Pick an airline to see its flights.


Delta (incl. Endeavor)	1,083	82%	2.3%	62 min

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 1248	ATL 09:19	MDT 11:11	88%
DL 2857	ATL 15:41	MDT 17:37	79%
DL 1283	ATL 21:59	MDT 23:55	78%

All 5 flights on this route →

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	ATL	MDT	1h 52m	82%	2.3%	1,083	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