ORD to LAS flight delays & on-time performance
Nonstop flights from Chicago O'Hare International Airport to Harry Reid International Airport · 1,514 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at ORD or LAS right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Chicago (ORD) to Las Vegas (LAS) arrived on time 74% of the time in Aug 2025 – Jul 2026, worse than the 78% national average.
- 1.4% were cancelled, and 10% arrived an hour or more late.
- United Airlines was the most punctual airline here (80% on time); American Airlines was the least (67%).
- Departures scheduled around 6am did best (91% on time); around 10pm did worst (50%).
- Tuesday was the most reliable day to fly (80% on time) and Sunday the least (69%).
- The largest source of delay minutes was late-arriving aircraft (48%).
Which airline is most on time from ORD to LAS?
Ranked by on-time arrival rate. Regional airlines fly under their partner's brand (e.g. SkyWest for Delta Connection or United Express).
| Airline | On time | Cancelled | Avg delay | 1 hr+ late | Flights |
|---|---|---|---|---|---|
| Spirit Airlines | 83% | 1.5% | 13 min | 5.6% | 198 |
| United Airlines | 80% | 0.5% | 14 min | 6.8% | 2,335 |
| Southwest Airlines | 73% | 0.8% | 20 min | 9.8% | 609 |
| American Airlines | 67% | 2.3% | 25 min | 12.4% | 1,893 |
| Frontier Airlines | 59% | 5.3% | 64 min | 20.5% | 206 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 6am91%425 flights
- 7am88%660 flights
- 8am85%92 flights
- 9am82%451 flights
- 10am74%493 flights
- 11am87%157 flights
- 12pm80%239 flights
- 1pm78%408 flights
- 2pm70%169 flights
- 3pm64%238 flights
- 4pm64%402 flights
- 5pm65%229 flights
- 6pm64%212 flights
- 7pm66%361 flights
- 8pm57%382 flights
- 9pm56%145 flights
- 10pm50%175 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday69%1.9% cancelled
- Tuesday80%1.1% cancelled
- Wednesday76%0.4% cancelled
- Thursday76%1.3% cancelled
- Friday71%1.1% cancelled
- Saturday77%1.3% cancelled
- Sunday69%2.4% cancelled
On-time trend by month
Why flights are late
Share of delay minutes by cause, as reported by airlines to the DOT.
- Late-arriving aircraft48%
- Airline (crew, maintenance, cleaning, fueling)27%
- Air traffic control & airport congestion19%
- Extreme weather6%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Extreme weather73%
- Airline (crew, maintenance, cleaning, fueling)16%
- Air traffic control & airport congestion11%
- Security0%
ORD to LAS: common questions
- How often are ORD to LAS flights on time?
- 74% of flights arrived less than 15 minutes late in Aug 2025 – Jul 2026, compared with 78% for all US flights.
- How often are flights from Chicago to Las Vegas cancelled?
- 1.4% of scheduled flights were cancelled (73 of 5,241).
- How long are typical delays?
- Across all flights the average arrival delay was 20 min (early arrivals count as zero). Flights that were late arrived 75 min behind schedule on average, and 9.6% of flights were an hour or more late.
- How long is taxi time at ORD?
- Flights on this route spent 26 min taxiing from the gate to takeoff on average.
Related routes
Return trip: LAS to ORD — 77% on time
More flights from Chicago
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: ORD → LAS, nonstop flights by US airlines that report to the DOT. How we calculate this.