BTS DATA COMPLETE THROUGH JUNE 2026HISTORICAL ODDS · NOT LIVE FLIGHT STATUS
DelayOddsKnow the route before you book
ATL→BUF

Atlanta, GA (ATL) to Buffalo, NY (BUF) flight delay odds

77.5% of 1,508 official scheduled ATL-to-BUF flights arrived on time; 12.9% arrived at least 30 minutes late and 1.9% were cancelled during July 2025–June 2026.

Source: U.S. Bureau of Transportation Statistics · Reporting window: July 2025–June 2026 · Updated September 16, 2026

HISTORICAL ROUTE SIGNALGenerally reliable
77.5%arrived on time
12.9%30+ min late
1.9%cancelled
1,508scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late6.4%all scheduled flights
120+ minutes late2.0%all scheduled flights
Diverted0.1%did not reach as scheduled
Average arrival+7.7 mincompleted flights

Which departure time was most reliable for ATL to BUF?

Among qualifying ATL-to-BUF departure window results, Early morning had the highest on-time rate: 84.1% of 63 flights. Afternoon was lowest at 74.4% across 540 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning6384.1%11.1%1.6%
Late morning53880.7%11.7%2.0%
Afternoon54074.4%14.3%1.7%
Night36276.0%12.7%2.2%

Which weekday was most reliable for ATL to BUF?

Among qualifying ATL-to-BUF weekday results, Wednesday had the highest on-time rate: 85.9% of 191 flights. Sunday was lowest at 70.2% across 235 flights.

DayFlightsOn time30+ minCancelled
Monday23073.0%15.2%3.0%
Tuesday21079.0%14.3%0.5%
Wednesday19185.9%6.3%0.0%
Thursday23081.3%10.4%1.3%
Friday23078.7%12.6%2.2%
Saturday18275.3%12.1%2.7%
Sunday23570.2%17.9%3.4%

Which airline was most reliable for ATL to BUF?

Among qualifying ATL-to-BUF airline results, Delta Air Lines had the highest on-time rate: 79.7% of 1,250 flights. Frontier Airlines was lowest at 66.9% across 257 flights.

AirlineFlightsOn time30+ minCancelled
Delta Air Lines1,25079.7%10.6%1.8%
Frontier Airlines25766.9%23.7%2.3%
Southwest Airlines10.0%100.0%0.0%

Which month was most reliable for ATL to BUF?

Among qualifying ATL-to-BUF month results, September 2025 had the highest on-time rate: 91.9% of 124 flights. December 2025 was lowest at 63.6% across 107 flights.

MonthFlightsOn time30+ minCancelled
July 202513469.4%19.4%1.5%
August 202513679.4%11.8%2.2%
September 202512491.9%1.6%0.0%
October 202514282.4%12.7%0.0%
November 202510881.5%12.0%2.8%
December 202510763.6%15.9%6.5%
January 20269871.4%17.3%7.1%
February 20269772.2%14.4%0.0%
March 202612878.1%11.7%1.6%
April 202614479.2%11.8%0.0%
May 202614976.5%14.1%1.3%
June 202614179.4%12.8%2.1%

What drove ATL to BUF delay minutes?

Airline was the largest recorded ATL-to-BUF delay category, accounting for 40.0% of 18,062 BTS-attributed delay minutes during July 2025–June 2026.

Airline40.0%
Late aircraft37.3%
National airspace15.2%
Weather7.6%
Security0.0%
This is historical evidence, not a forecast.

Weather, schedules and operations change. For a trip you have already booked, use the airline or airport for live status.