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

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

75.0% of 5,628 official scheduled SFO-to-ORD flights arrived on time; 15.5% 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
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

Which departure time was most reliable for SFO to ORD?

Among qualifying SFO-to-ORD departure window results, Early morning had the highest on-time rate: 88.0% of 1,614 flights. Afternoon was lowest at 63.1% across 1,752 flights.

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%

Which weekday was most reliable for SFO to ORD?

Among qualifying SFO-to-ORD weekday results, Tuesday had the highest on-time rate: 81.6% of 805 flights. Monday was lowest at 70.4% across 818 flights.

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%

Which airline was most reliable for SFO to ORD?

Among qualifying SFO-to-ORD airline results, United Airlines had the highest on-time rate: 77.1% of 3,815 flights. Alaska Airlines was lowest at 48.0% across 50 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%

Which month was most reliable for SFO to ORD?

Among qualifying SFO-to-ORD month results, February 2026 had the highest on-time rate: 85.2% of 357 flights. July 2025 was lowest at 68.5% across 534 flights.

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 SFO to ORD delay minutes?

Late aircraft was the largest recorded SFO-to-ORD delay category, accounting for 40.3% of 109,881 BTS-attributed delay minutes during July 2025–June 2026.

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.