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1,521 nonstop flights · Aug 2025 – Jul 2026 · US DOT on-time records, all US airlines

Delta is clearly ahead here: 4 in 5 of its flights arrive on time, 15 points better than Frontier.

Best time to leave 9–10 am 86% arrive on time from ATL
Best single flight DL 1384 ATL 09:04 → BUF 11:09 · 89% on time Avoid F9 1408 ATL 09:24 → BUF 11:34 · 67% 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).

8
9
10
11
12
13
14
15
16
17
18
19
20
21
ATL
80
85
62
62
82
79
85
72
79
% 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.

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 1,250 81% 1.8% 56 min
Frontier 270 66% 3.0% 83 min
Southwest 1 – 0.0% 92 min

Dimmed: fewer than 150 flights in the year, too few to rank.

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 1384 ATL 09:04 BUF 11:09 89%
DL 2266 ATL 14:00 BUF 16:06 82%
DL 2334 ATL 21:49 BUF 23:59 77%
DL 2050 ATL 16:33 BUF 18:41 75%
F9 1408 ATL 09:24 BUF 11:34 67%

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 BUF 2h 06m 81% 1.8% 1,250 Flying now
Frontier ATL BUF 2h 09m 66% 3.0% 270 Flying now
Southwest ATL BUF – 0%few flights 0.0% 1 Not 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