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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
Buffalo flights leaving ATL 4–5 pm: 1Close ×
DL 2050 ATL 16:33 BUF 18:41 2h 08m 271 75% 2.6% 57 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 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