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

Ontario, CA (ONT) to Las Vegas, NV (LAS) flight delay odds

76.8% of 2,479 official scheduled ONT-to-LAS flights arrived on time; 14.9% arrived at least 30 minutes late and 0.8% 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
76.8%arrived on time
14.9%30+ min late
0.8%cancelled
2,479scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late7.6%all scheduled flights
120+ minutes late2.6%all scheduled flights
Diverted0.0%did not reach as scheduled
Average arrival+7.8 mincompleted flights

Which departure time was most reliable for ONT to LAS?

Among qualifying ONT-to-LAS departure window results, Early morning had the highest on-time rate: 93.3% of 719 flights. Evening was lowest at 65.0% across 451 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning71993.3%3.2%0.8%
Late morning31480.6%12.1%1.3%
Afternoon71169.2%18.8%0.6%
Evening45165.0%24.4%1.1%
Night28468.7%22.9%0.7%

Which weekday was most reliable for ONT to LAS?

Among qualifying ONT-to-LAS weekday results, Saturday had the highest on-time rate: 85.7% of 272 flights. Friday was lowest at 65.3% across 386 flights.

DayFlightsOn time30+ minCancelled
Monday38873.2%16.8%1.5%
Tuesday33482.0%13.2%0.6%
Wednesday33383.8%7.5%0.3%
Thursday38473.4%19.5%0.5%
Friday38665.3%21.8%0.8%
Saturday27285.7%8.8%0.7%
Sunday38278.5%13.9%1.3%

Which airline was most reliable for ONT to LAS?

Among qualifying ONT-to-LAS airline results, Frontier Airlines had the highest on-time rate: 77.4% of 725 flights. Southwest Airlines was lowest at 76.6% across 1,754 flights.

AirlineFlightsOn time30+ minCancelled
Southwest Airlines1,75476.6%14.4%0.7%
Frontier Airlines72577.4%16.3%1.2%

Which month was most reliable for ONT to LAS?

Among qualifying ONT-to-LAS month results, February 2026 had the highest on-time rate: 88.0% of 192 flights. May 2026 was lowest at 64.3% across 199 flights.

MonthFlightsOn time30+ minCancelled
July 202521674.1%16.2%0.9%
August 202520379.8%10.8%1.0%
September 202520176.6%17.4%0.0%
October 202522878.9%14.0%0.4%
November 202521673.1%15.7%4.2%
December 202520683.5%9.7%1.0%
January 202621384.5%9.9%0.9%
February 202619288.0%8.9%0.5%
March 202619779.2%14.2%0.0%
April 202620271.8%19.3%0.0%
May 202619964.3%23.1%0.0%
June 202620668.0%19.9%1.0%

What drove ONT to LAS delay minutes?

Late aircraft was the largest recorded ONT-to-LAS delay category, accounting for 55.4% of 35,579 BTS-attributed delay minutes during July 2025–June 2026.

Airline16.0%
Late aircraft55.4%
National airspace27.8%
Weather0.7%
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.