Chicago (ORD) to Las Vegas (LAS): On-Time Performance
Data through July 2026
When you fly ORD to LAS matters as much as anything else about the booking: the route swung from 87% on-time in October 2024 to just 64% in April 2026. Across the full period the route averages 76% on-time against a national 78%. Morning departures also hold up better than evening ones (86% vs 62%), which matters most in the rough months.
- On-time
- 76%
- arrived <15 min late
- Avg delay
- 17 min
- completed flights
- Cancelled
- 1.1%
- Flights/day
- 14
- last 12 months
- Duration
- 4h 5m
- scheduled
- Distance
- 1,514 mi
Best airline from ORD to LAS
5 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| United Airlinesmost reliable | 82% | 13 min | 0.5% | 4,739 |
| Spirit Airlines | 79% | 17 min | 1.0% | 1,036 |
| Southwest Airlines | 77% | 16 min | 0.5% | 1,136 |
| American Airlines | 70% | 21 min | 1.5% | 3,662 |
| Frontier Airlines | 60% | 49 min | 4.8% | 420 |
Monthly on-time trend
Best time to fly from ORD to LAS
Aim for departures around 5 a.m. (93% on-time); avoid 10 p.m. departures (59%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 74% | 21 min |
| Tuesdaybest | 82% | 13 min |
| Wednesday | 79% | 15 min |
| Thursday | 74% | 19 min |
| Friday | 73% | 19 min |
| Saturday | 80% | 16 min |
| Sunday | 74% | 18 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft46%
- Airline operations28%
- National airspace system21%
- Weather5%
Frequently asked questions
- How often are flights from ORD to LAS delayed?
- 24% of ORD–LAS flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 17 minutes.
- Which airline is most reliable from ORD to LAS?
- United Airlines has the best on-time record on this route at 82%, based on 4,739 flights. 5 airlines flew ORD–LAS frequently enough to compare in this period.
- What is the best time of day to fly from ORD to LAS?
- Departures around 5 a.m. have the best record (93% 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 ORD to LAS?
- The scheduled ORD–LAS flight time averages 4h 5m over 1,514 miles. Actual arrival times vary — flights on this route land 15+ minutes late 24% of the time.
- How often are ORD to LAS flights cancelled?
- 1.1% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, at or below the national rate of 1.6%.
- What is the worst month to fly from ORD to LAS?
- April 2026 was the roughest month in this dataset, with only 64% of arrivals on time. The best was October 2024 at 87%. If your dates are flexible, that 22-point gap is worth planning around.
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Based on 10,993 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.