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

San Francisco, CA (SFO) to Chicago, IL (MDW) flight delay odds

73.4% of 455 official scheduled SFO-to-MDW flights arrived on time; 13.4% arrived at least 30 minutes late and 1.3% 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 SIGNALGenerally reliable
73.4%arrived on time
13.4%30+ min late
1.3%cancelled
455scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late5.3%all scheduled flights
120+ minutes late0.4%all scheduled flights
Diverted0.9%did not reach as scheduled
Average arrival+5.5 mincompleted flights

Which departure time was most reliable for SFO to MDW?

Among qualifying SFO-to-MDW departure window results, Early morning had the highest on-time rate: 86.0% of 279 flights. Night was lowest at 51.7% across 118 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning27986.0%4.3%1.8%
Late morning5162.7%17.6%0.0%
Night11851.7%30.5%0.8%

Which weekday was most reliable for SFO to MDW?

Among qualifying SFO-to-MDW weekday results, Tuesday had the highest on-time rate: 83.9% of 62 flights. Sunday was lowest at 64.2% across 67 flights.

DayFlightsOn time30+ minCancelled
Monday6675.8%12.1%1.5%
Tuesday6283.9%6.5%0.0%
Wednesday5978.0%11.9%0.0%
Thursday6674.2%13.6%3.0%
Friday6669.7%12.1%1.5%
Saturday6969.6%11.6%1.4%
Sunday6764.2%25.4%1.5%

Which airline was most reliable for SFO to MDW?

Only Southwest Airlines met the SFO-to-MDW airline threshold: 73.4% of 455 scheduled flights arrived on time during July 2025–June 2026.

AirlineFlightsOn time30+ minCancelled
Southwest Airlines45573.4%13.4%1.3%

Which month was most reliable for SFO to MDW?

Among qualifying SFO-to-MDW month results, October 2025 had the highest on-time rate: 90.3% of 31 flights. June 2026 was lowest at 61.7% across 60 flights.

MonthFlightsOn time30+ minCancelled
July 20253177.4%6.5%3.2%
August 20253174.2%12.9%0.0%
September 20253066.7%10.0%0.0%
October 20253190.3%3.2%0.0%
November 20253083.3%6.7%0.0%
December 20253183.9%6.5%0.0%
February 20261989.5%10.5%0.0%
March 20265678.6%5.4%5.4%
April 20266070.0%20.0%3.3%
May 20266262.9%19.4%0.0%
June 20266061.7%25.0%0.0%

What drove SFO to MDW delay minutes?

Late aircraft was the largest recorded SFO-to-MDW delay category, accounting for 60.2% of 4,530 BTS-attributed delay minutes during July 2025–June 2026.

Airline17.7%
Late aircraft60.2%
National airspace21.2%
Weather0.0%
Security0.9%
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.