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

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

66.7% of 5,627 official scheduled ORD-to-SFO flights arrived on time; 22.5% 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 SIGNALVariable
66.7%arrived on time
22.5%30+ min late
1.3%cancelled
5,627scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late12.5%all scheduled flights
120+ minutes late5.2%all scheduled flights
Diverted0.1%did not reach as scheduled
Average arrival+16.9 mincompleted flights

Which departure time was most reliable for ORD to SFO?

Among qualifying ORD-to-SFO departure window results, Early morning had the highest on-time rate: 80.5% of 1,366 flights. Evening was lowest at 53.1% across 1,396 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning1,36680.5%10.7%1.4%
Late morning91865.7%22.3%1.2%
Afternoon1,57868.6%22.6%0.6%
Evening1,39653.1%32.8%1.7%
Night36961.0%26.6%2.7%

Which weekday was most reliable for ORD to SFO?

Among qualifying ORD-to-SFO weekday results, Tuesday had the highest on-time rate: 75.0% of 805 flights. Sunday was lowest at 61.3% across 819 flights.

DayFlightsOn time30+ minCancelled
Monday81862.8%25.9%1.1%
Tuesday80575.0%16.9%1.2%
Wednesday79165.6%22.9%1.3%
Thursday81567.7%22.3%1.3%
Friday82564.1%22.3%1.0%
Saturday75470.4%19.6%1.6%
Sunday81961.3%27.0%1.7%

Which airline was most reliable for ORD to SFO?

Among qualifying ORD-to-SFO airline results, United Airlines had the highest on-time rate: 69.0% of 3,813 flights. Alaska Airlines was lowest at 54.0% across 50 flights.

AirlineFlightsOn time30+ minCancelled
United Airlines3,81369.0%20.8%1.0%
American Airlines1,76462.0%25.7%1.8%
Alaska Airlines5054.0%34.0%6.0%

Which month was most reliable for ORD to SFO?

Among qualifying ORD-to-SFO month results, September 2025 had the highest on-time rate: 77.6% of 490 flights. June 2026 was lowest at 49.1% across 530 flights.

MonthFlightsOn time30+ minCancelled
July 202553462.4%24.7%2.6%
August 202552370.9%17.4%2.7%
September 202549077.6%15.3%0.0%
October 202552270.5%19.5%0.4%
November 202541267.5%21.8%2.7%
December 202539265.8%25.3%0.5%
January 202632773.7%19.0%0.6%
February 202635672.8%18.8%0.0%
March 202645972.5%18.1%2.6%
April 202652365.0%24.9%1.3%
May 202655959.0%27.5%0.4%
June 202653049.1%33.8%1.5%

What drove ORD to SFO delay minutes?

Late aircraft was the largest recorded ORD-to-SFO delay category, accounting for 41.3% of 131,047 BTS-attributed delay minutes during July 2025–June 2026.

Airline24.6%
Late aircraft41.3%
National airspace29.6%
Weather4.4%
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.