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

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

88.6% of 1,239 official scheduled SLC-to-ONT flights arrived on time; 6.5% arrived at least 30 minutes late and 1.0% 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
88.6%arrived on time
6.5%30+ min late
1.0%cancelled
1,239scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late3.6%all scheduled flights
120+ minutes late1.3%all scheduled flights
Diverted0.0%did not reach as scheduled
Average arrival-1.8 mincompleted flights

Which departure time was most reliable for SLC to ONT?

Among qualifying SLC-to-ONT departure window results, Early morning had the highest on-time rate: 94.0% of 151 flights. Late morning was lowest at 84.7% across 372 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning15194.0%3.3%1.3%
Late morning37284.7%9.9%1.1%
Afternoon34691.3%4.9%1.2%
Night33287.3%6.0%0.6%

Which weekday was most reliable for SLC to ONT?

Among qualifying SLC-to-ONT weekday results, Friday had the highest on-time rate: 92.4% of 184 flights. Monday was lowest at 85.9% across 185 flights.

DayFlightsOn time30+ minCancelled
Monday18585.9%9.2%1.6%
Tuesday18190.1%5.0%0.6%
Wednesday17590.3%6.3%0.0%
Thursday18587.6%9.2%0.5%
Friday18492.4%3.8%0.0%
Saturday14686.3%6.2%2.1%
Sunday18387.4%5.5%2.2%

Which airline was most reliable for SLC to ONT?

Among qualifying SLC-to-ONT airline results, SkyWest Airlines had the highest on-time rate: 94.1% of 307 flights. Delta Air Lines was lowest at 86.7% across 902 flights.

AirlineFlightsOn time30+ minCancelled
Delta Air Lines90286.7%7.3%1.1%
SkyWest Airlines30794.1%3.9%0.3%
Frontier Airlines3090.0%6.7%3.3%

Which month was most reliable for SLC to ONT?

Among qualifying SLC-to-ONT month results, May 2026 had the highest on-time rate: 93.9% of 115 flights. February 2026 was lowest at 82.0% across 89 flights.

MonthFlightsOn time30+ minCancelled
July 202511689.7%8.6%0.0%
August 202511890.7%4.2%0.8%
September 202511090.9%6.4%0.0%
October 202511591.3%5.2%0.0%
November 20258887.5%5.7%3.4%
December 20259086.7%4.4%0.0%
January 20269283.7%8.7%2.2%
February 20268982.0%10.1%0.0%
March 20269483.0%8.5%5.3%
April 20269987.9%6.1%0.0%
May 202611593.9%4.3%0.9%
June 202611392.0%6.2%0.0%

What drove SLC to ONT delay minutes?

Airline was the largest recorded SLC-to-ONT delay category, accounting for 60.5% of 8,102 BTS-attributed delay minutes during July 2025–June 2026.

Airline60.5%
Late aircraft24.9%
National airspace8.8%
Weather5.8%
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.