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

San Jose, CA (SJC) to Ontario, CA (ONT) flight delay odds

83.4% of 1,316 official scheduled SJC-to-ONT flights arrived on time; 8.8% arrived at least 30 minutes late and 0.1% 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 SIGNALLower disruption
83.4%arrived on time
8.8%30+ min late
0.1%cancelled
1,316scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late3.4%all scheduled flights
120+ minutes late0.8%all scheduled flights
Diverted0.1%did not reach as scheduled
Average arrival+0.5 mincompleted flights

Which departure time was most reliable for SJC to ONT?

Among qualifying SJC-to-ONT departure window results, Early morning had the highest on-time rate: 97.2% of 363 flights. Night was lowest at 41.5% across 53 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning36397.2%1.4%0.3%
Late morning27887.8%7.6%0.0%
Afternoon25683.2%6.2%0.0%
Evening36672.4%15.8%0.0%
Night5341.5%30.2%0.0%

Which weekday was most reliable for SJC to ONT?

Among qualifying SJC-to-ONT weekday results, Tuesday had the highest on-time rate: 89.3% of 178 flights. Sunday was lowest at 74.1% across 201 flights.

DayFlightsOn time30+ minCancelled
Monday20682.5%8.3%0.5%
Tuesday17889.3%7.9%0.0%
Wednesday17188.9%7.0%0.0%
Thursday20283.7%7.9%0.0%
Friday20280.7%10.9%0.0%
Saturday15686.5%6.4%0.0%
Sunday20174.1%12.4%0.0%

Which airline was most reliable for SJC to ONT?

Only Southwest Airlines met the SJC-to-ONT airline threshold: 83.4% of 1,316 scheduled flights arrived on time during July 2025–June 2026.

AirlineFlightsOn time30+ minCancelled
Southwest Airlines1,31683.4%8.8%0.1%

Which month was most reliable for SJC to ONT?

Among qualifying SJC-to-ONT month results, January 2026 had the highest on-time rate: 90.1% of 101 flights. June 2026 was lowest at 71.1% across 114 flights.

MonthFlightsOn time30+ minCancelled
July 202511881.4%13.6%0.0%
August 202511084.5%6.4%0.0%
September 202510784.1%6.5%0.0%
October 202511071.8%12.7%0.0%
November 202511687.9%8.6%0.0%
December 202511884.7%6.8%0.0%
January 202610190.1%6.9%0.0%
February 20269988.9%5.1%0.0%
March 202610787.9%5.6%0.0%
April 202610685.8%6.6%0.0%
May 202611083.6%9.1%0.0%
June 202611471.1%16.7%0.9%

What drove SJC to ONT delay minutes?

Late aircraft was the largest recorded SJC-to-ONT delay category, accounting for 67.6% of 9,885 BTS-attributed delay minutes during July 2025–June 2026.

Airline29.3%
Late aircraft67.6%
National airspace2.7%
Weather0.4%
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.