Historical on-time performance
Chicago to Las Vegas
Flights on ORD–LAS arrive on time 73% of the time over the last 12 months.
based on 5,188 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
Too close to call — no single carrier is clearly more on-time here.
- Spirit AirlinesOn-time82%Medianon timep9030 minCancel0.4%Flights285
- United AirlinesOn-time79%Medianon timep9040 minCancel0.4%Flights2,330
- Southwest AirlinesOn-time72%Medianon timep9065 minCancel0.7%Flights723
- American AirlinesOn-time66%Medianon timep9075 minCancel2.0%Flights1,820
- Frontier AirlinesOn-time50%Medianon timep90105 minCancel10.0%Flights30
Why flights run late
Delay causes
- Airline29%
- Weather5%
- Air traffic (NAS)19%
- Late aircraft46%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline7%
- Weather78%
- Air traffic (NAS)15%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 54 cancellations with a reported cause (BTS reports causes from June 2003).
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly ORD → LAS
All airlines · rolling 36 months (2023-06 .. 2026-05).
Best time of day
Mornings are the most reliable time of day to fly this route — 87% on time.
- Mornings87% on time · p90 15 min · 4,919 flights
- Middays79% on time · p90 40 min · 4,060 flights
- Afternoons71% on time · p90 60 min · 2,401 flights
- Evenings63% on time · p90 80 min · 2,368 flights
- Overnights63% on time · p90 70 min · 2,261 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 72% to 80% on time.
- Saturdays80% on time · p90 40 min · 2,167 flights
- Wednesdays80% on time · p90 40 min · 2,128 flights
- Tuesdays79% on time · p90 40 min · 2,117 flights
- Mondays75% on time · p90 55 min · 2,375 flights
- Thursdays74% on time · p90 50 min · 2,377 flights
- Sundays73% on time · p90 55 min · 2,430 flights
- Fridays72% on time · p90 50 min · 2,417 flights
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