Route profile
LAS→ONT
Flight reliability, delays and best times to fly from Las Vegas to Ontario, 197 miles.
Right now
Aviation weather is not currently a factor.
Aviation weather is not currently a factor.
Route reliability
July 2023 – July 2026
Better than 66% of comparable major US routes (4,598 compared)
Calculated from 8,156 flights. How this is calculated
LAS → ONT arrives on time 78.1% of the time; the return trip, ONT → LAS, arrives on time 77.9% of the time.
LAS → ONT spends 22.2 minutes on the ground on a 197-mile trip: 16.9 minutes from pushback to wheels-up at LAS and 5.3 minutes from touchdown to gate at ONT.
Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – July 2026
What sets this route apart
Where LAS to ONT differs most from similar routes by hour, weekday, month and airline, July 2023 – July 2026.
LAS to ONT struggles most at 10 PM: 57.0% of its flights scheduled then arrive on time, 14 points behind the 71.0% on routes of similar length at the same hour. Against all other routes the gap is 14.7 points.
LAS to ONT is at its best against routes of similar length for flights scheduled at 8 AM: 92.3% arrive on time, 6 points ahead of the 86.3% those routes manage at that hour. Against all other routes the gap is 6.4 points.
January is kinder to LAS to ONT than to routes of similar length: 85.1% on time against 79.3%, 5.8 points better. Against all other routes the gap is 6 points.
In October, LAS to ONT runs 5.2 points below routes of similar length, 76.9% on time to 82.1%. Against all other routes the gap is 6.1 points.
Frontier Airlines does better on LAS to ONT than on its routes of similar length: 81.3% on time here, 72.6% there, 8.7 points apart. Against all other routes the gap is 10.1 points.
LAS to ONT against comparable routes
July 2023 – July 2026| Measure | This route | Compared with | Them | Gap | Flights behind it |
|---|---|---|---|---|---|
| Hour: 10 PM departures | 57.0% | routes of similar length | 71.0% | −14.0 pts | 402 here, 17,820 there |
| Hour: 8 AM departures | 92.3% | routes of similar length | 86.3% | +6.0 pts | 482 here, 36,281 there |
| Month: January | 85.1% | routes of similar length | 79.3% | +5.8 pts | 624 here, 40,447 there |
| Month: October | 76.9% | routes of similar length | 82.1% | −5.2 pts | 758 here, 46,860 there |
| Airline: Frontier Airlines | 81.3% | routes of similar length | 72.6% | +8.7 pts | 2,535 here, 5,423 there |
Each comparison pools the flights of other routes, with this route’s own left out. Similar length means within 15% of this route’s 197 miles, with at least 5 such routes. A bucket is set against the most comparable group that has enough flights: similar length, then the same origin (at least 3 routes), then all other routes. Hours, weekdays and months appear only where both sides have 120 completed flights, and airlines where both have 600. The gap must be at least 2 points and 2 standard errors, and only the largest gap each way is kept per measure. These are differences in the flights counted, not causes.
Why LAS → ONT flights are cancelled
July 2023 – July 2026
LAS → ONT cancelled 58 of 8,156 scheduled flights — about 1 in every 141. The reason filed most often was the airline, 41.4% of the cancellations coded on this route — about 1 in every 340 scheduled flights.
Share of cancellations
Of 58 cancelled departures carrying a reason code.
What each reason means
Crew, maintenance, aircraft cleaning, baggage or fueling: what BTS counts as within the carrier’s own control.
24 cancellations, 41.4% of the total.
Conditions the carrier judged severe enough to stop the flight: a blizzard, a hurricane, a line of thunderstorms.
22 cancellations, 37.9% of the total.
Airport capacity, air traffic control flow programs, heavy traffic and ordinary bad weather. A system decision, not the airline’s.
12 cancellations, 20.7% of the total.
A terminal evacuation, a security breach, screening equipment failure, or screening queues over 29 minutes.
0 cancellations, 0.0% of the total.
Reason codes are the operating airline’s own filing with US DOT, not an independent finding of fault. With only one or two carriers on the route, the split mostly reflects how they file. Ordinary bad weather is filed under air traffic, so weather’s full share is larger than its bar.
58 coded cancellations were recorded on LAS → ONT; the section appears from 50.
When it goes wrong
July 2023 – July 2026
41 min late
against a median of 6 min early
Percentiles over 8,156 operations; cancelled and diverted flights are counted separately.
Will your connection be tight enough?
Layovers at ONT after arriving from LAS.
| Connection time | Chance of missing | Reads as |
|---|---|---|
| 30 min | 37% | Likely to miss |
| 45 min | 21% | High risk |
| 60 min | 13% | Some risk |
| 90 min | 6.0% | Some risk |
| 120 min | 3.2% | Low risk |
This is one leg of a connection. Gate changes and the next flight's own schedule matter too. And a connection can fail before delay is even the question — this route cancels 0.71% of the time and diverts 0.04% of the time, which a late arrival never shows up in.
Chance of missing is the share of 8,095 arrivals on this route that landed later than the connection time less 30 minutes to reach the next gate.
The worst tenth of arrivals on this route land at least 41 minutes late (90th-percentile gate arrival delay), over 8,156 operations.
Any other layover length: connection checker.
Best time to fly
LAS → ONT flights departing 5–9 AM arrived on time 93.7% of the time, against 63.7% for 9 PM–5 AM departures, a gap of 30.0 percentage points.
By departure window
By departure hour
- 12 AM to 5 AM: too few flights to score
- 6 AM: 94.8% on time from 545 flights
- 7 AM: 93.7% on time from 692 flights
- 8 AM: 92.3% on time from 491 flights
- 9 AM: 87.0% on time from 497 flights
- 10 AM: 85.6% on time from 521 flights
- 11 AM: 82.7% on time from 483 flights
- 12 PM: 77.2% on time from 413 flights
- 1 PM: 78.8% on time from 398 flights
- 2 PM: 75.0% on time from 514 flights
- 3 PM: 67.8% on time from 411 flights
- 4 PM: 69.9% on time from 339 flights
- 5 PM: 72.8% on time from 367 flights
- 6 PM: 67.2% on time from 334 flights
- 7 PM: 72.7% on time from 622 flights
- 8 PM: 64.9% on time from 638 flights
- 9 PM: 69.8% on time from 441 flights
- 10 PM: 57.0% on time from 406 flights
- 11 PM: too few flights to score
Why LAS → ONT runs late
July 2023 – July 2026
the inbound aircraft was late, so this flight started late
crew, maintenance, boarding and fueling, all within the carrier’s control
airspace and airport capacity, including weather-driven flow control
weather severe enough to stop this flight specifically
screening or terminal security incidents
Share of the delay minutes US DOT attributed to each cause for LAS → ONT. Only delays of 15 minutes or more are attributed.
Late-arriving aircraft is the largest cause on LAS → ONT, at 59.2%: flights here mostly leave late because the plane came in late, and the day shows it: 5–9 AM departures arrived on time 93.7% of the time and 9 PM–5 AM departures 63.7%.
Airlines on this route
Carriers with at least 200 flights, by the airline that operated each one.
| Carrier | Flights | On time | Cancelled | Median delay | Severe |
|---|---|---|---|---|---|
| Southwest Airlines | 5,595 | 76.6% | 0.57% | -4 min | 5.9% |
| Frontier Airlines | 2,561 | 81.3% | 1.02% | -11 min | 7.0% |
Southwest Airlines flew 68.6% of the 8,156 flights listed.
Frontier Airlines arrived on time 4.7 percentage points more often than Southwest Airlines on this route.
Other ways to fly Las Vegas to Los Angeles
Airport pairs in the same two city markets, as the DOT defines them.
| Route | Flights | On time | Cancelled | Median delay | Score |
|---|---|---|---|---|---|
| LAS→LAX Las Vegas to Los Angeles | 28,239 | 77.6% | 0.68% | -5 min | 69 |
| LAS→BUR Las Vegas to Burbank | 13,373 | 79.4% | 1.44% | -7 min | 69 |
| LAS→SNA Las Vegas to Santa Ana | 12,678 | 81.0% | 0.88% | -7 min | 76 |
| LAS→ONT this route Las Vegas to Ontario | 8,156 | 78.1% | 0.71% | -6 min | 71 |
LAS → SNA is the most reliable pairing for this journey at 81.0% on time, against 77.6% for LAS → LAX.
Weekly and seasonal patterns
By day of week
Tuesday is historically the most reliable day and Sunday the least, a gap of 11.6 percentage points.
By month
- Jan: 85.1%
- Feb: 81.3%
- Mar: 76.2%
- Apr: 80.9%
- May: 75.8%
- Jun: 72.6%
- Jul: 72.4%
- Aug: 76.4%
- Sep: 76.5%
- Oct: 76.9%
- Nov: 82.2%
- Dec: 83.3%
July is historically the weakest month and January the strongest, a spread of 12.7 percentage points.
Reliability over time
July 2023 – July 2026
- July 2023: 73.9% from 219 flights
- August 2023: 70.4% from 246 flights
- September 2023: 76.1% from 248 flights
- October 2023: 74.8% from 266 flights
- November 2023: 83.0% from 230 flights
- December 2023: 87.1% from 217 flights
- January 2024: 86.8% from 197 flights
- February 2024: 84.0% from 182 flights
- March 2024: 71.0% from 224 flights
- April 2024: 76.0% from 225 flights
- May 2024: 71.5% from 236 flights
- June 2024: 77.6% from 237 flights
- July 2024: 70.6% from 247 flights
- August 2024: 78.8% from 232 flights
- September 2024: 76.1% from 240 flights
- October 2024: 86.0% from 264 flights
- November 2024: 89.3% from 242 flights
- December 2024: 86.2% from 224 flights
- January 2025: 85.8% from 222 flights
- February 2025: 81.1% from 191 flights
- March 2025: 82.1% from 219 flights
- April 2025: 84.6% from 222 flights
- May 2025: 79.8% from 224 flights
- June 2025: 73.8% from 211 flights
- July 2025: 72.3% from 215 flights
- August 2025: 80.7% from 203 flights
- September 2025: 77.6% from 201 flights
- October 2025: 68.9% from 228 flights
- November 2025: 72.8% from 216 flights
- December 2025: 76.1% from 207 flights
- January 2026: 82.8% from 212 flights
- February 2026: 79.2% from 192 flights
- March 2026: 75.6% from 197 flights
- April 2026: 82.2% from 202 flights
- May 2026: 76.4% from 200 flights
- June 2026: 65.9% from 206 flights
- July 2026: 73.0% from 212 flights
Over the most recent 12 months (2025-08 to 2026-07), on-time arrivals averaged 75.8% against 81.5% in the 12 months before — declining by 5.7 percentage points.
Data and methodology
Calculated by FlyerIntel from 8,156 LAS → ONT flight records from the US DOT Bureau of Transportation Statistics, covering July 2023 – July 2026. Late means 15 or more minutes past scheduled arrival; cancelled and diverted flights are left out of on-time rates.
Full methodology · Data sources · Report a problem
Related research: How Long a Layover Needs to Be · Two Airlines on One Route · Best Time of Day to Fly From Major US Airports
Analysis last recomputed