Route profile
ONT→LAS
Flight reliability, delays and best times to fly from Ontario to Las Vegas, 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 52% of comparable major US routes (4,598 compared)
Calculated from 8,191 flights. How this is calculated
ONT → LAS arrives on time 77.9% of the time; the return trip, LAS → ONT, arrives on time 78.1% of the time.
ONT → LAS spends 23.1 minutes on the ground on a 197-mile trip: 15.2 minutes from pushback to wheels-up at ONT and 8.0 minutes from touchdown to gate at LAS.
Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – July 2026
What stands out
Which day you fly matters unusually much here, a wider weekday spread than 96% of 4,467 comparable routes.
85.9% on time on a typical Saturday, against 70.2% on a Friday.
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026 · Ranked against every other route with the same kind of figure and at least 4,467 in the comparison.
What sets this route apart
Where ONT to LAS differs most from similar routes by hour, weekday, month and airline, July 2023 – July 2026.
ONT to LAS struggles most at 2 PM: 65.7% of its flights scheduled then arrive on time, 9.9 points behind the 75.6% on routes of similar length at the same hour. Against all other routes the gap is 8.9 points.
ONT to LAS is at its best against routes of similar length for flights scheduled at 6 PM: 75.9% arrive on time, 8.7 points ahead of the 67.2% those routes manage at that hour. Against all other routes the gap is 7.3 points.
ONT to LAS holds up on Saturdays better than routes of similar length do: 85.9% on time to their 80.0%, a 5.9 points lead. Against all other routes the gap is 6.8 points.
December is kinder to ONT to LAS than to routes of similar length: 86.7% on time against 78.5%, 8.2 points better. Against all other routes the gap is 8 points.
In April, ONT to LAS runs 6.1 points below routes of similar length, 73.3% on time to 79.4%. Against all other routes the gap is 6.6 points.
ONT to LAS against comparable routes
July 2023 – July 2026| Measure | This route | Compared with | Them | Gap | Flights behind it |
|---|---|---|---|---|---|
| Hour: 2 PM departures | 65.7% | routes of similar length | 75.6% | −9.9 pts | 364 here, 31,363 there |
| Hour: 6 PM departures | 75.9% | routes of similar length | 67.2% | +8.7 pts | 419 here, 31,663 there |
| Weekday: Saturday | 85.9% | routes of similar length | 80.0% | +5.9 pts | 905 here, 62,498 there |
| Month: December | 86.7% | routes of similar length | 78.5% | +8.2 pts | 648 here, 41,894 there |
| Month: April | 73.3% | routes of similar length | 79.4% | −6.1 pts | 656 here, 44,340 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 ONT → LAS flights are cancelled
July 2023 – July 2026
ONT → LAS cancelled 76 of 8,191 scheduled flights — about 1 in every 108. The reason filed most often was the airline, 47.4% of the cancellations coded on this route — about 1 in every 228 scheduled flights.
Share of cancellations
Of 76 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.
36 cancellations, 47.4% of the total.
Conditions the carrier judged severe enough to stop the flight: a blizzard, a hurricane, a line of thunderstorms.
28 cancellations, 36.8% 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, 15.8% 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.
76 coded cancellations were recorded on ONT → LAS; the section appears from 50.
When it goes wrong
July 2023 – July 2026
44 min late
against a median of 5 min early
Percentiles over 8,191 operations; cancelled and diverted flights are counted separately.
Will your connection be tight enough?
Layovers at LAS after arriving from ONT.
| Connection time | Chance of missing | Reads as |
|---|---|---|
| 30 min | 37% | Likely to miss |
| 45 min | 21% | High risk |
| 60 min | 14% | Some risk |
| 90 min | 6.9% | Some risk |
| 120 min | 3.9% | 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 0.93% 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 8,112 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 44 minutes late (90th-percentile gate arrival delay), over 8,191 operations.
Any other layover length: connection checker.
Best time to fly
ONT → LAS flights departing 5–9 AM arrived on time 94.7% of the time, against 65.8% for 3–6 PM departures, a gap of 28.9 percentage points.
By departure window
By departure hour
- 12 AM to 4 AM: too few flights to score
- 5 AM: 97.9% on time from 583 flights
- 6 AM: 94.3% on time from 603 flights
- 7 AM: 92.2% on time from 195 flights
- 8 AM: 92.8% on time from 615 flights
- 9 AM: 90.4% on time from 355 flights
- 10 AM: 82.0% on time from 366 flights
- 11 AM: 76.4% on time from 351 flights
- 12 PM: 76.5% on time from 470 flights
- 1 PM: 70.2% on time from 543 flights
- 2 PM: 65.7% on time from 369 flights
- 3 PM: 66.9% on time from 719 flights
- 4 PM: 66.4% on time from 381 flights
- 5 PM: 63.5% on time from 430 flights
- 6 PM: 75.9% on time from 426 flights
- 7 PM: 69.6% on time from 402 flights
- 8 PM: 75.1% on time from 516 flights
- 9 PM: 68.5% on time from 511 flights
- 10 PM: 74.8% on time from 294 flights
- 11 PM: too few flights to score
Why ONT → LAS runs late
July 2023 – July 2026
the inbound aircraft was late, so this flight started late
airspace and airport capacity, including weather-driven flow control
crew, maintenance, boarding and fueling, all within the carrier’s 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 ONT → LAS. Only delays of 15 minutes or more are attributed.
Late-arriving aircraft is the largest cause on ONT → LAS, at 50.9%: flights here mostly leave late because the plane came in late, and the day shows it: 5–9 AM departures arrived on time 94.7% of the time and 3–6 PM departures 65.8%.
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 | 5,629 | 78.8% | 0.66% | -5 min | 5.7% |
| Frontier Airlines | 2,562 | 75.9% | 1.52% | -8 min | 10.0% |
Southwest Airlines flew 68.7% of the 8,191 flights listed.
Southwest Airlines arrived on time 2.9 percentage points more often than Frontier Airlines on this route.
Other ways to fly Los Angeles to Las Vegas
Airport pairs in the same two city markets, as the DOT defines them.
| Route | Flights | On time | Cancelled | Median delay | Score |
|---|---|---|---|---|---|
| LAX→LAS Los Angeles to Las Vegas | 28,255 | 76.7% | 0.75% | -5 min | 66 |
| BUR→LAS Burbank to Las Vegas | 13,445 | 80.6% | 1.70% | -7 min | 69 |
| SNA→LAS Santa Ana to Las Vegas | 12,675 | 81.3% | 1.05% | -6 min | 72 |
| ONT→LAS this route Ontario to Las Vegas | 8,191 | 77.9% | 0.93% | -5 min | 67 |
SNA → LAS is the most reliable pairing for this journey at 81.3% on time, against 76.7% for LAX → LAS.
Flying to LAS from the Los Angeles area? Compare ONT, LAX, SNA, BUR for LAS, with the same test for what counts as a real difference.
Flights on this route
Flight numbers with at least 600 operations here and still on the schedule.
| Flight | Scheduled | Operations | On time |
|---|---|---|---|
| F92232 Frontier Airlines | 6:00 AM | 722 | 79.1% |
Weekly and seasonal patterns
By day of week
Saturday is historically the most reliable day and Friday the least, a gap of 15.7 percentage points.
By month
- Jan: 82.4%
- Feb: 85.1%
- Mar: 74.3%
- Apr: 73.3%
- May: 72.0%
- Jun: 72.5%
- Jul: 74.4%
- Aug: 75.6%
- Sep: 77.4%
- Oct: 79.2%
- Nov: 83.7%
- Dec: 86.7%
May is historically the weakest month and December the strongest, a spread of 14.7 percentage points.
Reliability over time
July 2023 – July 2026
- July 2023: 73.7% from 219 flights
- August 2023: 70.4% from 244 flights
- September 2023: 79.8% from 247 flights
- October 2023: 80.3% from 270 flights
- November 2023: 87.9% from 231 flights
- December 2023: 87.6% from 217 flights
- January 2024: 82.7% from 197 flights
- February 2024: 79.3% from 185 flights
- March 2024: 66.1% from 237 flights
- April 2024: 70.7% from 232 flights
- May 2024: 74.1% from 240 flights
- June 2024: 75.8% from 239 flights
- July 2024: 78.7% from 247 flights
- August 2024: 76.4% from 232 flights
- September 2024: 75.5% from 240 flights
- October 2024: 78.0% from 264 flights
- November 2024: 86.0% from 243 flights
- December 2024: 88.1% from 227 flights
- January 2025: 79.4% from 221 flights
- February 2025: 87.3% from 191 flights
- March 2025: 78.8% from 219 flights
- April 2025: 77.5% from 223 flights
- May 2025: 76.6% from 223 flights
- June 2025: 72.6% from 211 flights
- July 2025: 74.8% from 216 flights
- August 2025: 80.6% from 203 flights
- September 2025: 76.6% from 201 flights
- October 2025: 79.3% from 228 flights
- November 2025: 76.3% from 216 flights
- December 2025: 84.3% from 206 flights
- January 2026: 85.3% from 213 flights
- February 2026: 88.5% from 192 flights
- March 2026: 79.2% from 197 flights
- April 2026: 71.8% from 202 flights
- May 2026: 64.3% from 199 flights
- June 2026: 68.6% from 206 flights
- July 2026: 69.9% from 213 flights
Over the most recent 12 months (2025-08 to 2026-07), on-time arrivals averaged 77.0% against 79.2% in the 12 months before — declining by 2.2 percentage points.
Data and methodology
Calculated by FlyerIntel from 8,191 ONT → LAS 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