ATL to BUF flight delays & on-time performance
Nonstop flights from Hartsfield Jackson Atlanta International Airport to Buffalo Niagara International Airport · 712 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at ATL or BUF right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Atlanta (ATL) to Buffalo (BUF) arrived on time 77% of the time in Aug 2025 – Jul 2026, worse than the 78% national average.
- 2% were cancelled, and 8% arrived an hour or more late.
- Delta Air Lines was the most punctual airline here (80% on time); Frontier Airlines was the least (66%).
- Departures scheduled around 9am did best (85% on time); around 10am did worst (62%).
- Wednesday was the most reliable day to fly (85% on time) and Sunday the least (71%).
- The largest source of delay minutes was late-arriving aircraft (41%).
Which airline is most on time from ATL to BUF?
Ranked by on-time arrival rate. Regional airlines fly under their partner's brand (e.g. SkyWest for Delta Connection or United Express).
| Airline | On time | Cancelled | Avg delay | 1 hr+ late | Flights |
|---|---|---|---|---|---|
| Delta Air Lines | 80% | 1.8% | 12 min | 5.6% | 1,250 |
| Frontier Airlines | 66% | 3.0% | 29 min | 16.0% | 270 |
| Southwest Airlines | 0% | 0.0% | 92 min | 100.0% | 1 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 8am80%65 flights
- 9am85%406 flights
- 10am62%64 flights
- 11am62%74 flights
- 1pm78%139 flights
- 2pm78%109 flights
- 3pm78%103 flights
- 4pm71%181 flights
- 9pm76%363 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday74%3.8% cancelled
- Tuesday79%1.0% cancelled
- Wednesday85%0.0% cancelled
- Thursday81%0.9% cancelled
- Friday77%2.1% cancelled
- Saturday74%3.3% cancelled
- Sunday71%3.0% cancelled
On-time trend by month
Why flights are late
Share of delay minutes by cause, as reported by airlines to the DOT.
- Late-arriving aircraft41%
- Airline (crew, maintenance, cleaning, fueling)36%
- Air traffic control & airport congestion16%
- Extreme weather7%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Airline (crew, maintenance, cleaning, fueling)71%
- Extreme weather29%
- Air traffic control & airport congestion0%
- Security0%
ATL to BUF: common questions
- How often are ATL to BUF flights on time?
- 77% of flights arrived less than 15 minutes late in Aug 2025 – Jul 2026, compared with 78% for all US flights.
- How often are flights from Atlanta to Buffalo cancelled?
- 2.0% of scheduled flights were cancelled (31 of 1,521).
- How long are typical delays?
- Across all flights the average arrival delay was 15 min (early arrivals count as zero). Flights that were late arrived 61 min behind schedule on average, and 7.5% of flights were an hour or more late.
- How long is taxi time at ATL?
- Flights on this route spent 17 min taxiing from the gate to takeoff on average.
Related routes
Return trip: BUF to ATL — 80% on time
More flights from Atlanta
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: ATL → BUF, nonstop flights by US airlines that report to the DOT. How we calculate this.