Route on-time record
ATL to BUF: most on-time flights and the best time to fly
Atlanta (Hartsfield Jackson Atlanta International Airport) to Buffalo (Buffalo Niagara International Airport). 1,492 nonstop flights in Jun 2025 to May 2026, 77% arrived within 15 minutes and 2.1% were cancelled. The most reliable flight number was Delta 1384 at 9:00 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
ATL → BUF
Atlanta to Buffalo: 1,492 nonstop flights a year
On time (12 months)
77%
Cancelled
2.1%
avg delay 14 min
Best time to leave
Before 9 AM
86% on time vs 71% 3 to 6 PM
Most reliable airline
Delta
78% chance on time
Lowest nonstop fare seen in the next two months: $188 (Frontier 1408 on 2026-10-23). Fares open on our travel partner (Aviasales). Pick the flight number you chose here.
Most reliable nonstop flights
Ranked by the chance the flight operates and arrives within 15 minutes of schedule, from Jun 2025 to May 2026 records.
#1 · Delta 1384
9:00 AM → 11:01 AM2h 01m nonstop
Local times, typical schedule. Last flown 2026-05-31.
88%
chance on time
- On time (history)
- 90%
- Cancelled
- 2.2%
- Avg arrival delay
- 5 min
- Arrived on time 90% of the time (356 flights, Jun 2025 to May 2026).
- Departs outside ATL's trouble window (1 PM to 7 PM, when 59% of its 96 ground stops and delay programs started).
Strong track record · 356 flights
Find Delta 1384 fares Opens this date on Aviasales#2 · Delta 2266
1:56 PM → 3:53 PM2h 00m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Delta 2084; its record covers all of them.
76%
chance on time
- On time (history)
- 78%
- Cancelled
- 0.8%
- Avg arrival delay
- 11 min
- Arrived on time 78% of the time (236 flights, Jun 2025 to May 2026).
- Departs inside ATL's trouble window: 59% of its 96 ground stops and delay programs started between 1 PM and 7 PM.
Strong track record · 236 flights
Find Delta 2266 fares Opens this date on Aviasales#3 · Delta 2334
9:47 PM → 11:46 PM2h 01m nonstop
Local times, typical schedule. Last flown 2026-05-31.
73%
chance on time
- On time (history)
- 75%
- Cancelled
- 2.5%
- Avg arrival delay
- 16 min
- Arrived on time 75% of the time (356 flights, Jun 2025 to May 2026).
- Departs outside ATL's trouble window (1 PM to 7 PM, when 59% of its 96 ground stops and delay programs started).
Strong track record · 356 flights
Find Delta 2334 fares Opens this date on Aviasales#4 · Delta 2050
4:37 PM → 6:35 PM2h 01m nonstop
Local times, typical schedule. Last flown 2026-05-31.
71%
chance on time
- On time (history)
- 72%
- Cancelled
- 2.6%
- Avg arrival delay
- 17 min
- Arrived on time 72% of the time (265 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (3 to 6 PM: 71% on time; Before 9 AM: 86%).
- Departs inside ATL's trouble window: 59% of its 96 ground stops and delay programs started between 1 PM and 7 PM.
Strong track record · 265 flights
Find Delta 2050 fares Opens this date on Aviasales#5 · Frontier 1408
8:30 AM → 10:41 AM2h 11m nonstop
Local times, typical schedule. Last flown 2026-05-31.
68%
chance on time
- On time (history)
- 70%
- Cancelled
- 1.3%
- Avg arrival delay
- 26 min
- Arrived on time 70% of the time (154 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 86% on time; 3 to 6 PM: 71%).
- Departs outside ATL's trouble window (1 PM to 7 PM, when 59% of its 96 ground stops and delay programs started).
- 56% of its delay minutes came from the plane arriving late from an earlier flight.
Moderate track record · 154 flights
Find Frontier 1408 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- Delta Air Lines78%
1,245 flights · 79% on time as flown · 2.1% cancel
- Frontier Airlines68%
246 flights · 68% on time as flown · 2.3% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM86%
52 flights · avg delay 9 min
- 9 AM to noon82%
534 flights · avg delay 12 min
- Noon to 3 PM75%
255 flights · avg delay 13 min
- 3 to 6 PM71%
286 flights · avg delay 17 min
- After 9 PM75%
362 flights · avg delay 16 min
Best day: Wednesday (84%). Worst: Sunday (73%).
On time by month
All airlines, Jun 2023 to May 2026. Several years per month, so one stormy season doesn't define a month. Travel-month estimates use this seasonal pattern.
What delays this route
- Airline (crew, maintenance, boarding)42%
- Late-arriving aircraft35%
- Air traffic control and airport volume15%
- Severe weather8%
Share of delay minutes by the cause airlines report to the US DOT.
Historical odds, not a guarantee. Built from the US DOT Bureau of Transportation Statistics on-time reports (Jun 2025 to May 2026), FAA ground stop and delay program advisories, and 20 years of airport weather observations. Covers US airlines that report to the DOT; schedules are flights operated recently, so confirm times when you book. ATIS Alerts is not affiliated with any airline. Fares are what Aviasales travelers saw in recent searches (USD, one way, 1 adult), not live quotes; the partner site shows the current price. Fare links go to our travel partner and may earn us a commission at no cost to you. Affiliate disclosure
ATL to BUF questions
- What time of day is best to fly ATL to BUF?
- Before 9 AM: 86% of flights arrived on time, against 71% for departures 3 to 6 PM. Later flights inherit delays from earlier ones, so the first departures of the day usually run best.
- Which airline is most on time from ATL to BUF?
- Delta, with a season-adjusted 78% chance of operating and arriving on time over 1,245 flights. The adjustment compares each airline with what the route did in the months it flew, so a carrier that skipped a stormy month gets no free credit.
- What is the worst month for delays on ATL to BUF?
- July (68% on time); the best was November (90%), averaged over Jun 2023 to May 2026.
- Is this a prediction for my flight?
- No. These are historical odds from the US DOT on-time reports, FAA advisories and airport weather records. Check your flight status and the FAA delay board on the day you fly.
More routes from ATL
- BUF to ATL (return)
- ATL to LGA 73%
- ATL to MCO 69%
- ATL to FLL 69%
- ATL to DCA 69%
- ATL to DFW 73%
- ATL to ORD 71%
- ATL to EWR 72%
- ATL to MIA 70%
- ATL to TPA 71%
- ATL to PHL 73%
- ATL to DEN 76%
- ATL to BWI 74%
Live status: FAA delays and ground stops