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

Green Bay, WI (GRB) to Chicago, IL (ORD) flight delay odds

67.9% of 2,776 official scheduled GRB-to-ORD flights arrived on time; 19.1% arrived at least 30 minutes late and 4.3% 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 SIGNALHigher disruption
67.9%arrived on time
19.1%30+ min late
4.3%cancelled
2,776scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late11.8%all scheduled flights
120+ minutes late5.3%all scheduled flights
Diverted0.2%did not reach as scheduled
Average arrival+17.7 mincompleted flights

Which departure time was most reliable for GRB to ORD?

Among qualifying GRB-to-ORD departure window results, Early morning had the highest on-time rate: 78.1% of 953 flights. Evening was lowest at 48.7% across 579 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning95378.1%11.8%2.7%
Late morning62074.7%15.6%2.7%
Afternoon62363.7%22.2%5.1%
Evening57948.7%31.8%7.3%

Which weekday was most reliable for GRB to ORD?

Among qualifying GRB-to-ORD weekday results, Saturday had the highest on-time rate: 73.1% of 379 flights. Friday was lowest at 63.3% across 398 flights.

DayFlightsOn time30+ minCancelled
Monday42969.5%15.9%7.2%
Tuesday38371.5%17.8%2.3%
Wednesday36666.1%20.5%4.4%
Thursday40169.1%20.0%2.7%
Friday39863.3%22.1%2.5%
Saturday37973.1%15.6%4.7%
Sunday42063.3%22.1%5.5%

Which airline was most reliable for GRB to ORD?

Among qualifying GRB-to-ORD airline results, Envoy Air had the highest on-time rate: 72.3% of 1,375 flights. SkyWest Airlines was lowest at 62.7% across 1,235 flights.

AirlineFlightsOn time30+ minCancelled
Envoy Air1,37572.3%16.5%3.6%
SkyWest Airlines1,23562.7%22.8%4.8%
Republic Airways16671.1%13.3%5.4%

Which month was most reliable for GRB to ORD?

Among qualifying GRB-to-ORD month results, September 2025 had the highest on-time rate: 79.5% of 195 flights. March 2026 was lowest at 55.8% across 278 flights.

MonthFlightsOn time30+ minCancelled
July 202526565.7%23.8%1.5%
August 202523972.0%15.9%2.9%
September 202519579.5%10.3%1.0%
October 202521377.0%8.9%0.9%
November 202527169.4%13.7%9.6%
December 202524757.9%30.4%4.0%
January 202616462.8%27.4%1.2%
February 202616368.1%17.2%0.0%
March 202627855.8%25.9%12.2%
April 202631364.5%19.2%6.7%
May 202621774.2%18.0%0.9%
June 202621174.9%16.6%3.8%

What drove GRB to ORD delay minutes?

Late aircraft was the largest recorded GRB-to-ORD delay category, accounting for 42.3% of 64,275 BTS-attributed delay minutes during July 2025–June 2026.

Airline20.1%
Late aircraft42.3%
National airspace24.3%
Weather13.1%
Security0.2%
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.