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

Louisville, KY (SDF) to Chicago, IL (MDW) flight delay odds

82.3% of 989 official scheduled SDF-to-MDW flights arrived on time; 10.7% arrived at least 30 minutes late and 2.1% 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
82.3%arrived on time
10.7%30+ min late
2.1%cancelled
989scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late4.7%all scheduled flights
120+ minutes late1.7%all scheduled flights
Diverted0.4%did not reach as scheduled
Average arrival+1.6 mincompleted flights

Which departure time was most reliable for SDF to MDW?

Among qualifying SDF-to-MDW departure window results, Early morning had the highest on-time rate: 89.3% of 355 flights. Evening was lowest at 73.8% across 309 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning35589.3%6.2%1.4%
Late morning5479.6%14.8%1.9%
Afternoon25383.4%9.9%1.6%
Evening30973.8%15.5%3.6%

Which weekday was most reliable for SDF to MDW?

Among qualifying SDF-to-MDW weekday results, Tuesday had the highest on-time rate: 85.7% of 147 flights. Thursday was lowest at 77.0% across 152 flights.

DayFlightsOn time30+ minCancelled
Monday15079.3%10.0%2.7%
Tuesday14785.7%10.2%1.4%
Wednesday14584.1%10.3%1.4%
Thursday15277.0%15.1%2.6%
Friday14784.4%10.9%2.0%
Saturday10784.1%6.5%3.7%
Sunday14182.3%10.6%1.4%

Which airline was most reliable for SDF to MDW?

Only Southwest Airlines met the SDF-to-MDW airline threshold: 82.3% of 989 scheduled flights arrived on time during July 2025–June 2026.

AirlineFlightsOn time30+ minCancelled
Southwest Airlines98982.3%10.7%2.1%

Which month was most reliable for SDF to MDW?

Among qualifying SDF-to-MDW month results, February 2026 had the highest on-time rate: 94.6% of 56 flights. July 2025 was lowest at 74.0% across 104 flights.

MonthFlightsOn time30+ minCancelled
July 202510474.0%16.3%4.8%
August 20259090.0%4.4%1.1%
September 20258694.2%2.3%0.0%
October 20258783.9%11.5%0.0%
November 20257884.6%6.4%6.4%
December 20257878.2%14.1%0.0%
January 20266381.0%7.9%4.8%
February 20265694.6%3.6%0.0%
March 20268575.3%18.8%1.2%
April 20268779.3%14.9%1.1%
May 20268582.4%10.6%0.0%
June 20269075.6%13.3%5.6%

What drove SDF to MDW delay minutes?

Late aircraft was the largest recorded SDF-to-MDW delay category, accounting for 54.4% of 9,429 BTS-attributed delay minutes during July 2025–June 2026.

Airline20.3%
Late aircraft54.4%
National airspace24.4%
Weather0.9%
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.