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

Buffalo, NY (BUF) to Chicago, IL (ORD) flight delay odds

71.8% of 2,196 official scheduled BUF-to-ORD flights arrived on time; 16.8% arrived at least 30 minutes late and 2.9% 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 SIGNALVariable
71.8%arrived on time
16.8%30+ min late
2.9%cancelled
2,196scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late10.8%all scheduled flights
120+ minutes late6.0%all scheduled flights
Diverted0.1%did not reach as scheduled
Average arrival+17.9 mincompleted flights

Which departure time was most reliable for BUF to ORD?

Among qualifying BUF-to-ORD departure window results, Late morning had the highest on-time rate: 85.8% of 514 flights. Evening was lowest at 50.6% across 545 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning78281.5%10.9%1.7%
Late morning51485.8%9.1%1.4%
Afternoon35262.8%22.4%5.4%
Evening54550.6%28.4%4.4%

Which weekday was most reliable for BUF to ORD?

Among qualifying BUF-to-ORD weekday results, Thursday had the highest on-time rate: 75.5% of 322 flights. Sunday was lowest at 68.7% across 316 flights.

DayFlightsOn time30+ minCancelled
Monday32570.5%17.8%3.4%
Tuesday32072.5%15.0%2.2%
Wednesday31172.7%15.8%1.9%
Thursday32275.5%15.2%2.8%
Friday31970.5%16.3%3.1%
Saturday28372.1%18.4%1.8%
Sunday31668.7%19.0%4.7%

Which airline was most reliable for BUF to ORD?

Among qualifying BUF-to-ORD airline results, American Airlines had the highest on-time rate: 82.8% of 476 flights. SkyWest Airlines was lowest at 56.4% across 330 flights.

AirlineFlightsOn time30+ minCancelled
United Airlines61273.0%15.0%1.5%
American Airlines47682.8%10.3%1.5%
Envoy Air42368.3%19.4%3.3%
Republic Airways35573.2%15.2%3.7%
SkyWest Airlines33056.4%27.6%6.1%

Which month was most reliable for BUF to ORD?

Among qualifying BUF-to-ORD month results, June 2026 had the highest on-time rate: 79.9% of 209 flights. January 2026 was lowest at 61.0% across 164 flights.

MonthFlightsOn time30+ minCancelled
July 202521471.0%19.2%1.4%
August 202518472.3%15.8%2.2%
September 202517976.0%15.1%0.6%
October 202518176.8%12.7%0.0%
November 202518970.9%14.8%5.3%
December 202516661.4%25.9%4.8%
January 202616461.0%22.6%4.3%
February 202612770.1%16.5%0.8%
March 202618263.2%21.4%6.0%
April 202618574.1%13.5%4.9%
May 202621679.6%15.7%0.5%
June 202620979.9%10.0%3.8%

What drove BUF to ORD delay minutes?

Late aircraft was the largest recorded BUF-to-ORD delay category, accounting for 33.2% of 55,356 BTS-attributed delay minutes during July 2025–June 2026.

Airline32.4%
Late aircraft33.2%
National airspace29.0%
Weather5.3%
Security0.1%
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.