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

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

Historically, 75.0% of scheduled reportable flights on this direction arrived on time in July 2025–June 2026. The sample includes 5,628 flights.

HISTORICAL ROUTE SIGNALGenerally reliable
75.0%arrived on time
15.5%30+ min late
1.3%cancelled
5,628scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late8.7%all scheduled flights
120+ minutes late4.0%all scheduled flights
Diverted0.6%did not reach as scheduled
Average arrival+10.0 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 morning1,61488.0%6.1%1.4%
Late morning72269.3%19.1%1.9%
Afternoon1,75263.1%23.1%1.0%
Evening34375.5%17.8%2.0%
Night1,19778.3%14.1%1.1%

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
Monday81870.4%17.8%1.6%
Tuesday80581.6%9.6%0.7%
Wednesday78875.3%15.9%1.6%
Thursday81974.1%16.6%1.1%
Friday81773.9%17.1%1.1%
Saturday76577.5%13.2%1.2%
Sunday81672.7%17.9%1.7%

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 Airlines3,81577.1%14.0%1.0%
American Airlines1,76371.4%18.2%1.8%
Alaska Airlines5048.0%30.0%6.0%

Monthly trend

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

MonthFlightsOn time30+ minCancelled
July 202553468.5%20.6%3.0%
August 202552373.4%15.9%2.7%
September 202548684.0%8.8%0.0%
October 202552481.1%11.1%0.4%
November 202541176.2%14.1%2.4%
December 202539179.5%13.3%0.8%
January 202632972.3%15.2%0.3%
February 202635785.2%9.2%0.0%
March 202646173.1%15.2%2.6%
April 202652369.8%18.2%1.3%
May 202655972.6%18.2%0.2%
June 202653069.1%22.1%1.3%

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.

Airline32.4%
Late aircraft40.3%
National airspace25.0%
Weather2.2%
Security0.1%
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.