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Route on-time record

ORD to LAS: most on-time flights and the best time to fly

Chicago (Chicago O'Hare International Airport) to Las Vegas (Harry Reid International Airport). 5,367 nonstop flights in Jun 2025 to May 2026, 74% arrived within 15 minutes and 1.2% were cancelled. The most reliable flight number was United 574 at 7:15 AM.

Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.

ORD → LAS

Chicago to Las Vegas: 5,367 nonstop flights a year

On time (12 months)

74%

Cancelled

1.2%

avg delay 19 min

Best time to leave

Before 9 AM

89% on time vs 58% after 9 PM

Most reliable airline

United

79% chance on time

Check ORD to LAS fares

Lowest nonstop fare seen in the next two months: $107 (Frontier 3647 on 2026-11-12). Fares open on our travel partner (Aviasales). Pick the flight number you chose here.

Most reliable nonstop flights

Ranked by the chance the flight operates and arrives within 15 minutes of schedule, from Jun 2025 to May 2026 records.

  1. #1 · United 574

    7:15 AM → 9:31 AM4h 16m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    96%

    chance on time

    On time (history)
    96%
    Cancelled
    0.0%
    Avg arrival delay
    2 min
    • Arrived on time 96% of the time (273 flights, Jun 2025 to May 2026).
    • Never cancelled in 273 scheduled flights.
    • Leaves in this route's most on-time window (Before 9 AM: 89% on time; After 9 PM: 58%).
    • Departs outside ORD's trouble window (2 PM to 8 PM, when 44% of its 243 ground stops and delay programs started).

    Strong track record · 273 flights

    Find United 574 fares Opens this date on Aviasales

  2. #2 · United 501

    6:00 AM → 8:13 AM4h 13m nonstop

    Local times, typical schedule. Last flown 2026-03-28.

    92%

    chance on time

    On time (history)
    95%
    Cancelled
    0.0%
    Avg arrival delay
    7 min
    • Arrived on time 95% of the time (21 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 89% on time; After 9 PM: 58%).
    • Departs outside ORD's trouble window (2 PM to 8 PM, when 44% of its 243 ground stops and delay programs started).
    • Short track record (21 flights), so its score leans on the airline's record at this hour.

    Limited track record · 21 flights

    Find United 501 fares Opens this date on Aviasales

  3. #3 · Southwest 4646

    6:15 AM → 8:15 AM4h 00m nonstop

    Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Southwest 3786; its record covers all of them.

    89%

    chance on time

    On time (history)
    89%
    Cancelled
    0.0%
    Avg arrival delay
    15 min
    • Arrived on time 89% of the time (85 flights, Jun 2025 to May 2026).
    • Never cancelled in 86 scheduled flights.
    • Leaves in this route's most on-time window (Before 9 AM: 89% on time; After 9 PM: 58%).
    • Departs outside ORD's trouble window (2 PM to 8 PM, when 44% of its 243 ground stops and delay programs started).

    Moderate track record · 85 flights

    Find Southwest 4646 fares Opens this date on Aviasales

  4. #4 · United 1862

    10:12 AM → 12:28 PM4h 16m nonstop

    Local times, typical schedule. Last flown 2026-05-20. Same departure also flew as United 2275; its record covers all of them.

    85%

    chance on time

    On time (history)
    85%
    Cancelled
    0.0%
    Avg arrival delay
    9 min
    • Arrived on time 85% of the time (74 flights, Jun 2025 to May 2026).
    • Never cancelled in 74 scheduled flights.
    • Departs outside ORD's trouble window (2 PM to 8 PM, when 44% of its 243 ground stops and delay programs started).
    • Lands inside LAS's trouble window: 51% of its 104 ground stops and delay programs started between 10 AM and 4 PM.

    Moderate track record · 74 flights

    Find United 1862 fares Opens this date on Aviasales

  5. #5 · United 2440

    1:05 PM → 3:19 PM4h 14m nonstop

    Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as United 214; its record covers all of them.

    84%

    chance on time

    On time (history)
    85%
    Cancelled
    0.0%
    Avg arrival delay
    9 min
    • Arrived on time 85% of the time (256 flights, Jun 2025 to May 2026).
    • Never cancelled in 256 scheduled flights.
    • Departs outside ORD's trouble window (2 PM to 8 PM, when 44% of its 243 ground stops and delay programs started).
    • Lands inside LAS's trouble window: 51% of its 104 ground stops and delay programs started between 10 AM and 4 PM.

    Strong track record · 256 flights

    Find United 2440 fares Opens this date on Aviasales

  6. #6 · United 2684

    9:10 AM → 11:25 AM4h 15m nonstop

    Local times, typical schedule. Last flown 2026-05-20.

    83%

    chance on time

    On time (history)
    81%
    Cancelled
    0.0%
    Avg arrival delay
    13 min
    • Arrived on time 81% of the time (84 flights, Jun 2025 to May 2026).
    • Never cancelled in 84 scheduled flights.
    • Departs outside ORD's trouble window (2 PM to 8 PM, when 44% of its 243 ground stops and delay programs started).
    • Lands inside LAS's trouble window: 51% of its 104 ground stops and delay programs started between 10 AM and 4 PM.

    Moderate track record · 84 flights

    Find United 2684 fares Opens this date on Aviasales

  7. #7 · United 2137

    9:04 AM → 11:08 AM4h 04m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    82%

    chance on time

    On time (history)
    81%
    Cancelled
    0.0%
    Avg arrival delay
    17 min
    • Arrived on time 81% of the time (63 flights, Jun 2025 to May 2026).
    • Never cancelled in 63 scheduled flights.
    • Departs outside ORD's trouble window (2 PM to 8 PM, when 44% of its 243 ground stops and delay programs started).
    • Lands inside LAS's trouble window: 51% of its 104 ground stops and delay programs started between 10 AM and 4 PM.

    Moderate track record · 63 flights

    Find United 2137 fares Opens this date on Aviasales

  8. #8 · United 1933

    9:25 AM → 11:48 AM4h 23m nonstop

    Local times, typical schedule. Last flown 2026-03-28.

    80%

    chance on time

    On time (history)
    80%
    Cancelled
    0.4%
    Avg arrival delay
    11 min
    • Arrived on time 80% of the time (269 flights, Jun 2025 to May 2026).
    • Departs outside ORD's trouble window (2 PM to 8 PM, when 44% of its 243 ground stops and delay programs started).
    • Lands inside LAS's trouble window: 51% of its 104 ground stops and delay programs started between 10 AM and 4 PM.

    Strong track record · 269 flights

    Find United 1933 fares Opens this date on Aviasales

  9. #9 · United 215

    10:39 AM → 12:59 PM4h 20m nonstop

    Local times, typical schedule. Last flown 2026-03-28.

    79%

    chance on time

    On time (history)
    79%
    Cancelled
    0.0%
    Avg arrival delay
    17 min
    • Arrived on time 79% of the time (101 flights, Jun 2025 to May 2026).
    • Never cancelled in 101 scheduled flights.
    • Departs outside ORD's trouble window (2 PM to 8 PM, when 44% of its 243 ground stops and delay programs started).
    • Lands inside LAS's trouble window: 51% of its 104 ground stops and delay programs started between 10 AM and 4 PM.

    Moderate track record · 101 flights

    Find United 215 fares Opens this date on Aviasales

  10. #10 · United 1733

    10:57 AM → 1:02 PM4h 05m nonstop

    Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as United 2031; its record covers all of them.

    78%

    chance on time

    On time (history)
    71%
    Cancelled
    0.0%
    Avg arrival delay
    16 min
    • Arrived on time 71% of the time (42 flights, Jun 2025 to May 2026).
    • Never cancelled in 43 scheduled flights.
    • Departs outside ORD's trouble window (2 PM to 8 PM, when 44% of its 243 ground stops and delay programs started).
    • Lands inside LAS's trouble window: 51% of its 104 ground stops and delay programs started between 10 AM and 4 PM.

    Limited track record · 42 flights

    Find United 1733 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • United Airlines79%

    2,330 flights · 80% on time as flown · 0.4% cancel

  • Spirit Airlines78%

    320 flights · 81% on time as flown · 1.2% cancel

  • Southwest Airlines72%

    723 flights · 72% on time as flown · 0.8% cancel

  • American Airlines67%

    1,820 flights · 68% on time as flown · 1.9% cancel

  • Frontier Airlines60%

    174 flights · 57% on time as flown · 3.6% cancel

On time by departure time

All airlines, scheduled local departure, Jun 2025 to May 2026.

  • Before 9 AM89%

    1,268 flights · avg delay 8 min

  • 9 AM to noon79%

    1,078 flights · avg delay 14 min

  • Noon to 3 PM78%

    839 flights · avg delay 14 min

  • 3 to 6 PM64%

    839 flights · avg delay 27 min

  • 6 to 9 PM59%

    1,025 flights · avg delay 32 min

  • After 9 PM58%

    318 flights · avg delay 37 min

Best day: Saturday (81%). Worst: Friday (73%).

Smarter routing

Nearby airports that run more on time

  • MDW → LAS 76% chance on time

    Chicago Midway International Airport to Harry Reid International Airport · 2,405 flights a year · 15 mi from your airports · yours: 73%

    Rank flightsFares

On time by month

All airlines, Jun 2023 to May 2026. Several years per month, so one stormy season doesn't define a month. Travel-month estimates use this seasonal pattern.

J
77
F
80
M
78
A
75
M
73
J
73
J
66
A
74
S
81
O
82
N
83
D
81

What delays this route

  • Late-arriving aircraft46%
  • Airline (crew, maintenance, boarding)29%
  • Air traffic control and airport volume19%
  • Severe weather5%

Share of delay minutes by the cause airlines report to the US DOT.

Historical odds, not a guarantee. Built from the US DOT Bureau of Transportation Statistics on-time reports (Jun 2025 to May 2026), FAA ground stop and delay program advisories, and 20 years of airport weather observations. Covers US airlines that report to the DOT; schedules are flights operated recently, so confirm times when you book. ATIS Alerts is not affiliated with any airline. Fares are what Aviasales travelers saw in recent searches (USD, one way, 1 adult), not live quotes; the partner site shows the current price. Fare links go to our travel partner and may earn us a commission at no cost to you. Affiliate disclosure

ORD to LAS questions

What time of day is best to fly ORD to LAS?
Before 9 AM: 89% of flights arrived on time, against 58% for departures after 9 PM. Later flights inherit delays from earlier ones, so the first departures of the day usually run best.
Which airline is most on time from ORD to LAS?
United, with a season-adjusted 79% chance of operating and arriving on time over 2,330 flights. The adjustment compares each airline with what the route did in the months it flew, so a carrier that skipped a stormy month gets no free credit.
What is the worst month for delays on ORD to LAS?
July (66% on time); the best was November (83%), averaged over Jun 2023 to May 2026.
Is this a prediction for my flight?
No. These are historical odds from the US DOT on-time reports, FAA advisories and airport weather records. Check your flight status and the FAA delay board on the day you fly.

More routes from ORD

Live status: FAA delays and ground stops