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

Ontario, CA (ONT) to Sacramento, CA (SMF) flight delay odds

85.5% of 2,109 official scheduled ONT-to-SMF flights arrived on time; 8.1% arrived at least 30 minutes late and 0.2% 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 SIGNALLower disruption
85.5%arrived on time
8.1%30+ min late
0.2%cancelled
2,109scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late4.4%all scheduled flights
120+ minutes late1.1%all scheduled flights
Diverted0.0%did not reach as scheduled
Average arrival-1.1 mincompleted flights

Which departure time was most reliable for ONT to SMF?

Among qualifying ONT-to-SMF departure window results, Early morning had the highest on-time rate: 97.7% of 531 flights. Evening was lowest at 78.2% across 648 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning53197.7%1.1%0.0%
Late morning34490.4%4.1%0.3%
Afternoon56880.1%9.0%0.2%
Evening64878.2%14.4%0.3%

Which weekday was most reliable for ONT to SMF?

Among qualifying ONT-to-SMF weekday results, Wednesday had the highest on-time rate: 88.4% of 302 flights. Sunday was lowest at 80.5% across 287 flights.

DayFlightsOn time30+ minCancelled
Monday34584.9%6.4%0.3%
Tuesday31187.1%6.4%0.0%
Wednesday30288.4%7.6%0.3%
Thursday34284.8%7.6%0.3%
Friday34285.7%8.5%0.0%
Saturday18088.3%7.8%0.6%
Sunday28780.5%12.5%0.0%

Which airline was most reliable for ONT to SMF?

Only Southwest Airlines met the ONT-to-SMF airline threshold: 85.5% of 2,109 scheduled flights arrived on time during July 2025–June 2026.

AirlineFlightsOn time30+ minCancelled
Southwest Airlines2,10985.5%8.1%0.2%

Which month was most reliable for ONT to SMF?

Among qualifying ONT-to-SMF month results, September 2025 had the highest on-time rate: 93.2% of 177 flights. June 2026 was lowest at 76.8% across 177 flights.

MonthFlightsOn time30+ minCancelled
July 202517886.5%11.8%0.0%
August 202517892.1%2.8%0.6%
September 202517793.2%2.3%0.0%
October 202518181.8%9.9%0.0%
November 202517888.8%4.5%0.6%
December 202517985.5%8.9%0.0%
January 202615587.1%8.4%0.0%
February 202615285.5%8.6%0.0%
March 202618388.0%9.3%0.0%
April 202618482.6%7.6%0.5%
May 202618779.1%11.2%0.5%
June 202617776.8%11.3%0.0%

What drove ONT to SMF delay minutes?

Late aircraft was the largest recorded ONT-to-SMF delay category, accounting for 76.8% of 15,982 BTS-attributed delay minutes during July 2025–June 2026.

Airline20.2%
Late aircraft76.8%
National airspace2.6%
Weather0.3%
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.