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

San Diego, CA (SAN) to Chicago, IL (ORD) flight delay odds

Historically, 76.2% of scheduled reportable flights on this direction arrived on time in July 2025–June 2026. The sample includes 3,807 flights.

HISTORICAL ROUTE SIGNALGenerally reliable
76.2%arrived on time
14.0%30+ min late
1.3%cancelled
3,807scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late7.9%all scheduled flights
120+ minutes late3.5%all scheduled flights
Diverted1.1%did not reach as scheduled
Average arrival+7.2 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 morning1,01382.7%9.4%1.8%
Late morning53679.9%11.2%0.7%
Afternoon1,33563.4%22.5%1.3%
Evening43976.5%14.4%1.4%
Night48493.4%3.1%1.2%

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
Monday56673.5%15.2%1.8%
Tuesday53382.9%9.8%0.6%
Wednesday51677.7%13.2%1.6%
Thursday56175.9%12.8%0.9%
Friday56175.4%16.9%0.7%
Saturday49978.0%14.4%1.8%
Sunday57170.6%15.4%2.1%

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
United Airlines1,67280.7%10.6%0.5%
American Airlines1,38675.0%15.2%1.8%
Alaska Airlines68870.8%16.7%2.3%
Frontier Airlines6137.7%50.8%1.6%

Monthly trend

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

MonthFlightsOn time30+ minCancelled
July 202533669.6%19.9%1.5%
August 202532070.3%18.4%0.9%
September 202526982.5%11.2%0.4%
October 202535782.1%9.0%1.1%
November 202531871.1%16.7%3.8%
December 202530975.4%14.9%2.3%
January 202624775.7%14.2%1.2%
February 202624285.5%7.4%0.0%
March 202633270.5%16.3%2.7%
April 202633377.5%14.7%0.3%
May 202636482.4%7.4%0.5%
June 202638073.9%16.6%1.1%

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.

Airline25.5%
Late aircraft36.3%
National airspace32.6%
Weather5.7%
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.