Route profile
LAS→ORD
Flight reliability, delays and best times to fly from Las Vegas to Chicago, 1,514 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 16,379 flights. How this is calculated
LAS → ORD arrives on time 79.6% of the time; the return trip, ORD → LAS, arrives on time 76.6% of the time, a 3.0-point gap between the two directions of the same city pair.
LAS → ORD spends 34.1 minutes on the ground on a 1,514-mile trip: 18.3 minutes from pushback to wheels-up at LAS and 15.8 minutes from touchdown to gate at ORD.
Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – July 2026
What stands out
The airline matters unusually much on this route, a wider carrier-to-carrier gap than 96% of 2,692 comparable routes.
United Airlines arrived on time 83.0% of the time, against 61.8% for Frontier Airlines, flying the exact same route.
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 2,692 in the comparison.
Why LAS → ORD flights are cancelled
July 2023 – July 2026
LAS → ORD cancelled 188 of 16,379 scheduled flights — about 1 in every 87. The reason filed most often was extreme weather, 53.7% of the cancellations coded on this route — about 1 in every 162 scheduled flights.
Share of cancellations
Of 188 cancelled departures carrying a reason code.
What each reason means
Conditions the carrier judged severe enough to stop the flight: a blizzard, a hurricane, a line of thunderstorms.
101 cancellations, 53.7% of the total.
Crew, maintenance, aircraft cleaning, baggage or fueling: what BTS counts as within the carrier’s own control.
76 cancellations, 40.4% of the total.
Airport capacity, air traffic control flow programs, heavy traffic and ordinary bad weather. A system decision, not the airline’s.
11 cancellations, 5.9% 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. Ordinary bad weather is filed under air traffic, so weather’s full share is larger than its bar.
188 coded cancellations were recorded on LAS → ORD; the section appears from 50.
When it goes wrong
July 2023 – July 2026
42 min late
against a median of 8 min early
Percentiles over 16,379 operations; cancelled and diverted flights are counted separately.
Will your connection be tight enough?
Layovers at ORD after arriving from LAS.
| Connection time | Chance of missing | Reads as |
|---|---|---|
| 30 min | 35% | Likely to miss |
| 45 min | 20% | High risk |
| 60 min | 13% | Some risk |
| 90 min | 7.0% | Some risk |
| 120 min | 4.5% | 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 1.15% of the time and diverts 0.53% of the time, which a late arrival never shows up in.
Chance of missing is the share of 16,105 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 42 minutes late (90th-percentile gate arrival delay), over 16,379 operations.
Any other layover length: connection checker.
Best time to fly
LAS → ORD flights departing 5–9 AM arrived on time 90.0% of the time, against 67.2% for 12–3 PM departures, a gap of 22.8 percentage points.
By day and hour
On-time arrival rate for each weekday and scheduled departure hour, in local time at the departure airport (LAS).
Hour of departure matters more than day of the week: hourly averages sit a typical 8.4 points from the route-wide rate, weekday averages 3.2 points.
| Hour | Monday | Tuesday | Wednesday | Thursday | Friday | Saturday | Sunday |
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On-time rate, % · stronger color, fewer on time
- 50–59
- 60–69
- 70–79
- 80–89
- 90–99
- Fewer than 120 flights, not scored
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026 · On time is arrival within 15 minutes of schedule. Cells round to whole percentages; the table shows one decimal.
No slot is named best or worst: too few reach 500 flights.
View as tableHide table
| Hour | Monday | Tuesday | Wednesday | Thursday | Friday | Saturday | Sunday |
|---|---|---|---|---|---|---|---|
| 12 AM–1 AM | 74.4% on time123 flights | 107 flights, too few to score | 92 flights, too few to score | 89 flights, too few to score | 74.4% on time123 flights | 82.5% on time121 flights | 88.8% on time126 flights |
| 1 AM–2 AM | 5 flights, too few to score | 5 flights, too few to score | 5 flights, too few to score | 5 flights, too few to score | 5 flights, too few to score | 5 flights, too few to score | 7 flights, too few to score |
| 2 AM–3 AM | 0 flights, too few to score | 0 flights, too few to score | 0 flights, too few to score | 0 flights, too few to score | 0 flights, too few to score | 0 flights, too few to score | 0 flights, too few to score |
| 3 AM–4 AM | 0 flights, too few to score | 0 flights, too few to score | 0 flights, too few to score | 0 flights, too few to score | 0 flights, too few to score | 0 flights, too few to score | 0 flights, too few to score |
| 4 AM–5 AM | 0 flights, too few to score | 0 flights, too few to score | 0 flights, too few to score | 0 flights, too few to score | 0 flights, too few to score | 0 flights, too few to score | 0 flights, too few to score |
| 5 AM–6 AM | 34 flights, too few to score | 27 flights, too few to score | 28 flights, too few to score | 33 flights, too few to score | 34 flights, too few to score | 20 flights, too few to score | 26 flights, too few to score |
| 6 AM–7 AM | 103 flights, too few to score | 92 flights, too few to score | 97 flights, too few to score | 112 flights, too few to score | 104 flights, too few to score | 109 flights, too few to score | 88.9% on time126 flights |
| 7 AM–8 AM | 92.0% on time266 flights | 93.0% on time259 flights | 92.0% on time254 flights | 92.0% on time264 flights | 87.2% on time263 flights | 90.5% on time265 flights | 88.8% on time271 flights |
| 8 AM–9 AM | 96 flights, too few to score | 109 flights, too few to score | 92 flights, too few to score | 106 flights, too few to score | 93 flights, too few to score | 89 flights, too few to score | 102 flights, too few to score |
| 9 AM–10 AM | 76.8% on time178 flights | 84.0% on time177 flights | 88.1% on time160 flights | 85.6% on time181 flights | 81.1% on time179 flights | 96 flights, too few to score | 85.3% on time173 flights |
| 10 AM–11 AM | 85.9% on time150 flights | 89.0% on time140 flights | 85.8% on time141 flights | 88.2% on time155 flights | 83.2% on time151 flights | 87.1% on time143 flights | 77.0% on time165 flights |
| 11 AM–12 PM | 77.3% on time173 flights | 82.5% on time209 flights | 81.1% on time222 flights | 75.4% on time179 flights | 81.4% on time178 flights | 82.0% on time143 flights | 78.6% on time185 flights |
| 12 PM–1 PM | 61.3% on time179 flights | 72.6% on time136 flights | 68.1% on time139 flights | 68.5% on time153 flights | 59.1% on time174 flights | 75.0% on time158 flights | 61.3% on time144 flights |
| 1 PM–2 PM | 106 flights, too few to score | 88 flights, too few to score | 84 flights, too few to score | 80 flights, too few to score | 103 flights, too few to score | 99 flights, too few to score | 91 flights, too few to score |
| 2 PM–3 PM | 64.0% on time178 flights | 81.3% on time164 flights | 69.5% on time167 flights | 63.5% on time167 flights | 66.1% on time181 flights | 78.5% on time180 flights | 63.3% on time181 flights |
| 3 PM–4 PM | 118 flights, too few to score | 87 flights, too few to score | 91 flights, too few to score | 103 flights, too few to score | 118 flights, too few to score | 102 flights, too few to score | 110 flights, too few to score |
| 4 PM–5 PM | 96 flights, too few to score | 74 flights, too few to score | 79 flights, too few to score | 101 flights, too few to score | 100 flights, too few to score | 89 flights, too few to score | 116 flights, too few to score |
| 5 PM–6 PM | 71.7% on time181 flights | 84.8% on time151 flights | 86.7% on time159 flights | 67.5% on time172 flights | 65.7% on time183 flights | 79.9% on time164 flights | 70.9% on time181 flights |
| 6 PM–7 PM | 102 flights, too few to score | 71 flights, too few to score | 76 flights, too few to score | 70.5% on time122 flights | 106 flights, too few to score | 59 flights, too few to score | 107 flights, too few to score |
| 7 PM–8 PM | 21 flights, too few to score | 13 flights, too few to score | 13 flights, too few to score | 20 flights, too few to score | 20 flights, too few to score | 11 flights, too few to score | 24 flights, too few to score |
| 8 PM–9 PM | 4 flights, too few to score | 0 flights, too few to score | 0 flights, too few to score | 0 flights, too few to score | 6 flights, too few to score | 0 flights, too few to score | 0 flights, too few to score |
| 9 PM–10 PM | 0 flights, too few to score | 0 flights, too few to score | 0 flights, too few to score | 0 flights, too few to score | 0 flights, too few to score | 1 flight, too few to score | 1 flight, too few to score |
| 10 PM–11 PM | 1 flight, too few to score | 1 flight, too few to score | 0 flights, too few to score | 1 flight, too few to score | 1 flight, too few to score | 1 flight, too few to score | 1 flight, too few to score |
| 11 PM–12 AM | 81.8% on time327 flights | 89.7% on time287 flights | 85.4% on time300 flights | 79.3% on time357 flights | 82.1% on time350 flights | 87.6% on time319 flights | 80.2% on time359 flights |
By departure window
By departure hour
- 12 AM: 79.8% on time from 781 flights
- 1 AM to 4 AM: too few flights to score
- 5 AM: 93.0% on time from 202 flights
- 6 AM: 92.0% on time from 743 flights
- 7 AM: 90.8% on time from 1,842 flights
- 8 AM: 84.7% on time from 687 flights
- 9 AM: 83.6% on time from 1,144 flights
- 10 AM: 85.0% on time from 1,045 flights
- 11 AM: 79.8% on time from 1,289 flights
- 12 PM: 66.3% on time from 1,083 flights
- 1 PM: 64.9% on time from 651 flights
- 2 PM: 69.3% on time from 1,218 flights
- 3 PM: 64.5% on time from 729 flights
- 4 PM: 76.3% on time from 655 flights
- 5 PM: 74.9% on time from 1,191 flights
- 6 PM: 76.9% on time from 643 flights
- 7 PM: 83.5% on time from 122 flights
- 8 PM to 10 PM: too few flights to score
- 11 PM: 83.5% on time from 2,299 flights
Why LAS → ORD 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 → ORD. Only delays of 15 minutes or more are attributed.
Late-arriving aircraft is the largest cause on LAS → ORD, at 42.7%: flights here mostly leave late because the plane came in late, and the day shows it: 5–9 AM departures arrived on time 90.0% of the time and 12–3 PM departures 67.2%.
How this route holds up in bad weather
July 2023 – July 2026
The harder-hit end is ORD, where the flight lands. Its figure counts departures from ORD, so it says more about how that airport copes than about this route. Bad weather cancels 5.5 times the normal rate at ORD against 2.4 times at LAS. Cancelled in bad weather against normal hours: LAS 2.0% against 0.8%, ORD 6.5% against 1.2%. Flights that did leave ORD in bad weather arrived on time 55.7% of the time, against 77.1% in normal hours.
Bad weather and normal hours at the airports
Scheduled departures, July 2023 – July 2026| Departures from | LAS | ORD |
|---|---|---|
| Cancelled in bad weather | 2.0% | 6.5% |
| Cancelled in normal hours | 0.8% | 1.2% |
| Arrived on time, bad weather | 58.5% | 55.7% |
| Arrived on time, normal hours | 78.5% | 77.1% |
| Departures in bad weather | 14,522 | 104,455 |
Of the carriers on this route, United Airlines (1.0% cancelled against 2.0% for the other carriers at LAS) cancelled the fewest departures from LAS in bad weather and Frontier Airlines (4.0% cancelled against 1.8% for the other carriers at LAS) the most.
This route’s airlines in bad weather at LAS
All departures from LAS| Airline | Bad-weather departures | Cancelled | Other carriers |
|---|---|---|---|
| United Airlines | 1,215 | 1.0%below the others | 2.0% |
| American Airlines | 1,081 | 0.9%below the others | 1.9% |
| Southwest Airlines | 6,925 | 2.0%about level | 2.1% |
| Spirit Airlines | 1,398 | 3.8%above the others | 2.3% |
| Frontier Airlines | 943 | 4.0%above the others | 1.8% |
These are airport figures, not route figures: every scheduled departure from LAS and ORD, to any destination, in hours the weather report called bad. The airline rows count each carrier’s departures from LAS on every route.
Weather source and limits. In full: LAS (airlines), ORD, What Weather Costs Each Airport, Who Cancels More When the Weather Turns, Airports That Change Places When Weather Turns.
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 |
|---|---|---|---|---|---|
| United Airlines | 6,807 | 83.0% | 1.03% | -10 min | 5.7% |
| American Airlines | 5,269 | 77.5% | 1.29% | -9 min | 8.8% |
| Southwest Airlines | 1,971 | 76.1% | 0.81% | -5 min | 7.1% |
| Spirit Airlines | 1,875 | 80.7% | 0.85% | -6 min | 5.3% |
| Frontier Airlines | 457 | 61.8% | 3.94% | 4 min | 15.6% |
United Airlines flew 41.6% of the 16,379 flights listed. Frontier Airlines cancelled 3.94% of its flights here against 0.81% for Southwest Airlines.
United Airlines arrived on time 21.2 percentage points more often than Frontier Airlines on this route.
Flights on this route
Flight numbers with at least 600 operations here and still on the schedule.
UA664 (7:00 AM) arrived on time 92.3% of the time, 4.4 points more often than AA2258 (7:00 AM) at 87.9%.
Weekly and seasonal patterns
By day of week
Tuesday is historically the most reliable day and Monday the least, a gap of 7.5 percentage points.
By month
- Jan: 81.6%
- Feb: 85.7%
- Mar: 77.3%
- Apr: 81.7%
- May: 76.3%
- Jun: 76.3%
- Jul: 71.3%
- Aug: 75.5%
- Sep: 82.1%
- Oct: 82.4%
- Nov: 84.7%
- Dec: 84.2%
July is historically the weakest month and February the strongest, a spread of 14.4 percentage points.
Reliability over time
July 2023 – July 2026
- July 2023: 74.5% from 452 flights
- August 2023: 75.8% from 448 flights
- September 2023: 85.5% from 513 flights
- October 2023: 85.9% from 525 flights
- November 2023: 89.4% from 415 flights
- December 2023: 88.4% from 387 flights
- January 2024: 80.8% from 395 flights
- February 2024: 86.8% from 391 flights
- March 2024: 75.5% from 432 flights
- April 2024: 84.8% from 462 flights
- May 2024: 70.4% from 530 flights
- June 2024: 75.9% from 437 flights
- July 2024: 66.5% from 438 flights
- August 2024: 72.8% from 473 flights
- September 2024: 83.1% from 456 flights
- October 2024: 83.0% from 495 flights
- November 2024: 89.7% from 408 flights
- December 2024: 87.4% from 399 flights
- January 2025: 85.1% from 390 flights
- February 2025: 86.0% from 381 flights
- March 2025: 85.2% from 464 flights
- April 2025: 84.9% from 434 flights
- May 2025: 80.1% from 472 flights
- June 2025: 77.6% from 466 flights
- July 2025: 71.0% from 479 flights
- August 2025: 77.8% from 485 flights
- September 2025: 77.6% from 481 flights
- October 2025: 78.0% from 482 flights
- November 2025: 74.1% from 390 flights
- December 2025: 76.1% from 359 flights
- January 2026: 78.7% from 356 flights
- February 2026: 84.3% from 394 flights
- March 2026: 71.1% from 489 flights
- April 2026: 75.9% from 504 flights
- May 2026: 79.0% from 483 flights
- June 2026: 75.3% from 395 flights
- July 2026: 73.0% from 419 flights
Over the most recent 12 months (2025-08 to 2026-07), on-time arrivals averaged 76.7% against 81.9% in the 12 months before — declining by 5.2 percentage points.
Data and methodology
Calculated by FlyerIntel from 16,379 LAS → ORD 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