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

Ontario, CA (ONT) to Salt Lake City, UT (SLC) flight delay odds

90.8% of 1,239 official scheduled ONT-to-SLC flights arrived on time; 5.3% arrived at least 30 minutes late and 0.9% 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
90.8%arrived on time
5.3%30+ min late
0.9%cancelled
1,239scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late3.1%all scheduled flights
120+ minutes late1.7%all scheduled flights
Diverted0.1%did not reach as scheduled
Average arrival-5.9 mincompleted flights

Which departure time was most reliable for ONT to SLC?

Among qualifying ONT-to-SLC departure window results, Late morning had the highest on-time rate: 95.7% of 162 flights. Afternoon was lowest at 87.1% across 512 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning36894.8%2.7%0.5%
Late morning16295.7%3.1%1.2%
Afternoon51287.1%7.4%1.0%
Evening19788.8%6.6%1.0%

Which weekday was most reliable for ONT to SLC?

Among qualifying ONT-to-SLC weekday results, Wednesday had the highest on-time rate: 94.3% of 175 flights. Thursday was lowest at 84.9% across 185 flights.

DayFlightsOn time30+ minCancelled
Monday18588.1%5.9%2.7%
Tuesday18193.4%3.3%0.6%
Wednesday17594.3%4.0%0.0%
Thursday18584.9%9.2%0.5%
Friday18491.8%6.0%0.0%
Saturday14691.1%4.8%2.1%
Sunday18392.3%3.8%0.5%

Which airline was most reliable for ONT to SLC?

Among qualifying ONT-to-SLC airline results, SkyWest Airlines had the highest on-time rate: 91.9% of 307 flights. Frontier Airlines was lowest at 86.7% across 30 flights.

AirlineFlightsOn time30+ minCancelled
Delta Air Lines90290.6%5.8%1.1%
SkyWest Airlines30791.9%3.9%0.3%
Frontier Airlines3086.7%6.7%0.0%

Which month was most reliable for ONT to SLC?

Among qualifying ONT-to-SLC month results, June 2026 had the highest on-time rate: 96.5% of 113 flights. March 2026 was lowest at 84.0% across 94 flights.

MonthFlightsOn time30+ minCancelled
July 202511691.4%5.2%0.0%
August 202511894.1%2.5%0.8%
September 202511090.9%6.4%0.0%
October 202511593.9%6.1%0.0%
November 20258888.6%3.4%3.4%
December 20259085.6%6.7%0.0%
January 20269284.8%9.8%2.2%
February 20268988.8%11.2%0.0%
March 20269484.0%7.4%4.3%
April 20269990.9%5.1%0.0%
May 202611595.7%1.7%0.9%
June 202611396.5%0.9%0.0%

What drove ONT to SLC delay minutes?

Airline was the largest recorded ONT-to-SLC delay category, accounting for 54.7% of 8,422 BTS-attributed delay minutes during July 2025–June 2026.

Airline54.7%
Late aircraft37.6%
National airspace3.5%
Weather4.1%
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.