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

Grand Rapids, MI (GRR) to Chicago, IL (MDW) flight delay odds

76.5% of 931 official scheduled GRR-to-MDW flights arrived on time; 10.3% arrived at least 30 minutes late and 0.4% 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
76.5%arrived on time
10.3%30+ min late
0.4%cancelled
931scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late3.5%all scheduled flights
120+ minutes late1.9%all scheduled flights
Diverted0.5%did not reach as scheduled
Average arrival+5.0 mincompleted flights

Which departure time was most reliable for GRR to MDW?

Among qualifying GRR-to-MDW departure window results, Early morning had the highest on-time rate: 83.3% of 347 flights. Evening was lowest at 64.8% across 301 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning34783.3%6.1%0.9%
Afternoon26582.3%8.3%0.0%
Evening30164.8%17.3%0.3%

Which weekday was most reliable for GRR to MDW?

Among qualifying GRR-to-MDW weekday results, Thursday had the highest on-time rate: 79.9% of 139 flights. Sunday was lowest at 73.7% across 137 flights.

DayFlightsOn time30+ minCancelled
Monday13875.4%10.9%1.4%
Tuesday14175.9%7.8%0.0%
Wednesday13876.1%10.1%0.0%
Thursday13979.9%6.5%0.7%
Friday13876.8%11.6%0.0%
Saturday10078.0%12.0%1.0%
Sunday13773.7%13.9%0.0%

Which airline was most reliable for GRR to MDW?

Only Southwest Airlines met the GRR-to-MDW airline threshold: 76.5% of 931 scheduled flights arrived on time during July 2025–June 2026.

AirlineFlightsOn time30+ minCancelled
Southwest Airlines93176.5%10.3%0.4%

Which month was most reliable for GRR to MDW?

Among qualifying GRR-to-MDW month results, October 2025 had the highest on-time rate: 86.4% of 88 flights. December 2025 was lowest at 68.3% across 60 flights.

MonthFlightsOn time30+ minCancelled
July 20258973.0%10.1%0.0%
August 20258773.6%12.6%0.0%
September 20258669.8%14.0%0.0%
October 20258886.4%3.4%0.0%
November 20255976.3%11.9%3.4%
December 20256068.3%20.0%0.0%
January 20266279.0%11.3%0.0%
February 20265676.8%5.4%0.0%
March 20268575.3%12.9%2.4%
April 20268682.6%4.7%0.0%
May 20268783.9%8.0%0.0%
June 20268670.9%11.6%0.0%

What drove GRR to MDW delay minutes?

Late aircraft was the largest recorded GRR-to-MDW delay category, accounting for 41.4% of 9,551 BTS-attributed delay minutes during July 2025–June 2026.

Airline19.2%
Late aircraft41.4%
National airspace37.2%
Weather2.2%
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.