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

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

70.1% of 3,807 official scheduled ORD-to-SAN flights arrived on time; 18.8% arrived at least 30 minutes late and 1.2% 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
70.1%arrived on time
18.8%30+ min late
1.2%cancelled
3,807scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late10.0%all scheduled flights
120+ minutes late3.5%all scheduled flights
Diverted0.3%did not reach as scheduled
Average arrival+11.7 mincompleted flights

Which departure time was most reliable for ORD to SAN?

Among qualifying ORD-to-SAN departure window results, Early morning had the highest on-time rate: 83.6% of 911 flights. Night was lowest at 48.1% across 135 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning91183.6%9.4%0.8%
Late morning85770.6%18.0%0.8%
Afternoon1,03069.3%20.5%0.6%
Evening87459.8%25.3%2.4%
Night13548.1%33.3%3.0%

Which weekday was most reliable for ORD to SAN?

Among qualifying ORD-to-SAN weekday results, Tuesday had the highest on-time rate: 76.1% of 535 flights. Friday was lowest at 65.4% across 560 flights.

DayFlightsOn time30+ minCancelled
Monday56767.9%22.0%0.7%
Tuesday53576.1%14.0%0.7%
Wednesday51572.4%18.1%1.0%
Thursday56169.3%18.0%0.9%
Friday56065.4%22.1%0.7%
Saturday49974.3%17.0%1.2%
Sunday57066.3%20.0%3.0%

Which airline was most reliable for ORD to SAN?

Among qualifying ORD-to-SAN airline results, United Airlines had the highest on-time rate: 76.4% of 1,672 flights. Frontier Airlines was lowest at 53.2% across 62 flights.

AirlineFlightsOn time30+ minCancelled
United Airlines1,67276.4%14.7%0.3%
American Airlines1,38565.0%22.7%1.7%
Alaska Airlines68866.7%19.0%2.3%
Frontier Airlines6253.2%41.9%0.0%

Which month was most reliable for ORD to SAN?

Among qualifying ORD-to-SAN month results, September 2025 had the highest on-time rate: 76.7% of 270 flights. December 2025 was lowest at 61.7% across 308 flights.

MonthFlightsOn time30+ minCancelled
July 202533565.4%23.9%0.9%
August 202532073.1%18.8%0.6%
September 202527076.7%15.2%0.0%
October 202535773.1%13.4%0.8%
November 202531866.4%20.4%3.8%
December 202530861.7%26.9%1.9%
January 202624871.8%19.0%1.2%
February 202624276.0%14.9%0.0%
March 202633273.2%16.6%3.0%
April 202633362.5%21.0%0.6%
May 202636476.6%12.4%0.3%
June 202638067.1%22.9%0.8%

What drove ORD to SAN delay minutes?

Late aircraft was the largest recorded ORD-to-SAN delay category, accounting for 40.3% of 72,037 BTS-attributed delay minutes during July 2025–June 2026.

Airline30.9%
Late aircraft40.3%
National airspace22.4%
Weather6.5%
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.