Las Vegas (LAS) to Ontario (ONT): On-Time Performance
Data through May 2026
Las Vegas (LAS) to Ontario (ONT) effectively runs on two schedules. In November 2024, 89% of arrivals were on time; in October 2025 that fell to 69% — a 20-point seasonal swing. Across the full period the route averages 79% on-time against a national 78%. Morning departures also hold up better than evening ones (90% vs 69%), which matters most in the rough months.
- On-time
- 79%
- arrived <15 min late
- Avg delay
- 13 min
- completed flights
- Cancelled
- 0.7%
- Flights/day
- 6.8
- last 12 months
- Duration
- 1h 6m
- scheduled
- Distance
- 197 mi
Best airline from LAS to ONT
2 airlines flew this route regularly between 2024-06 and 2026-05.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Frontier Airlinesmost reliable | 82% | 15 min | 1.1% | 1,674 |
| Southwest Airlines | 78% | 12 min | 0.5% | 3,574 |
Monthly on-time trend
Best time to fly from LAS to ONT
Aim for departures around 7 a.m. (96% on-time); avoid 10 p.m. departures (59%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 74% | 19 min |
| Tuesdaybest | 86% | 9 min |
| Wednesday | 83% | 9 min |
| Thursday | 77% | 15 min |
| Friday | 76% | 14 min |
| Saturday | 85% | 8 min |
| Sunday | 76% | 14 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft60%
- Airline operations31%
- National airspace system8%
- Weather1%
Frequently asked questions
- How often are flights from LAS to ONT delayed?
- 21% of LAS–ONT flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-06 and 2026-05. The average arrival delay across completed flights was 13 minutes.
- Which airline is most reliable from LAS to ONT?
- Frontier Airlines has the best on-time record on this route at 82%, based on 1,674 flights. 2 airlines flew LAS–ONT frequently enough to compare in this period.
- What is the best time of day to fly from LAS to ONT?
- Departures around 7 a.m. have the best record (96% on-time), while departures around 10 p.m. have the worst (59%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from LAS to ONT?
- The scheduled LAS–ONT flight time averages 1h 6m over 197 miles. Actual arrival times vary — flights on this route land 15+ minutes late 21% of the time.
- How often are LAS to ONT flights cancelled?
- 0.7% of scheduled flights on this route were cancelled between 2024-06 and 2026-05, at or below the national rate of 1.6%.
- What is the worst month to fly from LAS to ONT?
- October 2025 was the roughest month in this dataset, with only 69% of arrivals on time. The best was November 2024 at 89%. If your dates are flexible, that 20-point gap is worth planning around.
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Based on 5,248 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.