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

Chicago, IL (MDW) to San Jose, CA (SJC) flight delay odds

Historically, 67.8% of scheduled reportable flights on this direction arrived on time in July 2025–June 2026. The sample includes 537 flights.

HISTORICAL ROUTE SIGNALVariable
67.8%arrived on time
18.6%30+ min late
1.5%cancelled
537scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late9.5%all scheduled flights
120+ minutes late2.0%all scheduled flights
Diverted0.0%did not reach as scheduled
Average arrival+12.0 mincompleted flights

When is this route most reliable?

The same route can behave differently through the day. These are scheduled departure windows, not actual departure times. Small time windows with fewer than 40 flights are withheld.

Departure windowFlightsOn time30+ minCancelled
Early morning15683.3%5.8%0.6%
Late morning12670.6%12.7%0.8%
Afternoon6066.7%26.7%0.0%
Evening17656.2%26.7%2.8%

Weekday comparison

Day-of-week results use at least 30 scheduled flights per row. Look for broad patterns, not tiny percentage differences.

DayFlightsOn time30+ minCancelled
Monday8466.7%20.2%2.4%
Tuesday8172.8%16.0%1.2%
Wednesday7874.4%14.1%1.3%
Thursday8371.1%13.3%2.4%
Friday8369.9%13.3%0.0%
Saturday6165.6%19.7%3.3%
Sunday6750.7%37.3%0.0%

Airline comparison

Marketing-carrier results make codeshare flights easier to compare as travelers buy them. Dedicated route-airline reports require at least 160 flights.

AirlineFlightsOn time30+ minCancelled
Southwest Airlines53767.8%18.6%1.5%

Monthly trend

Month-by-month results show whether a twelve-month average hides an unusual period.

MonthFlightsOn time30+ minCancelled
July 20257972.2%17.7%0.0%
August 20255576.4%10.9%1.8%
September 20255271.2%11.5%0.0%
October 20253259.4%21.9%0.0%
November 20253080.0%10.0%6.7%
December 20253177.4%16.1%0.0%
January 20261471.4%7.1%0.0%
February 20261989.5%5.3%0.0%
March 20265257.7%28.8%3.8%
April 20265664.3%19.6%1.8%
May 20265768.4%22.8%0.0%
June 20266048.3%30.0%3.3%

What drove reported delay minutes?

BTS cause minutes are reported for qualifying delayed flights. These shares describe recorded delay minutes—not the chance that a particular cause will affect your next flight.

Airline37.0%
Late aircraft48.8%
National airspace13.5%
Weather0.7%
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.