Historical on-time performance
Las Vegas to Chicago
Flights on LAS–ORD arrive on time 75% of the time over the last 12 months.
based on 5,191 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-time83%Medianon timep9025 minCancel0.0%Flights289
- United AirlinesOn-time79%Medianon timep9035 minCancel0.4%Flights2,332
- American AirlinesOn-time74%Medianon timep9055 minCancel2.0%Flights1,817
- Southwest AirlinesOn-time66%Medianon timep9055 minCancel0.3%Flights723
- Frontier AirlinesOn-time57%Medianon timep90110 minCancel6.7%Flights30
Why flights run late
Delay causes
- Airline26%
- Weather1%
- Air traffic (NAS)30%
- Late aircraft42%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline14%
- Weather75%
- Air traffic (NAS)12%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 51 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 LAS → ORD
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 — 88% on time.
- Mornings88% on time · p90 15 min · 4,591 flights
- Overnights82% on time · p90 35 min · 2,152 flights
- Early mornings79% on time · p90 35 min · 798 flights
- Evenings75% on time · p90 55 min · 1,967 flights
- Middays73% on time · p90 45 min · 4,051 flights
- Afternoons68% on time · p90 60 min · 2,452 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 75% to 83% on time.
- Saturdays83% on time · p90 30 min · 2,142 flights
- Wednesdays82% on time · p90 30 min · 2,134 flights
- Tuesdays82% on time · p90 30 min · 2,132 flights
- Thursdays76% on time · p90 40 min · 2,361 flights
- Sundays76% on time · p90 45 min · 2,444 flights
- Fridays75% on time · p90 45 min · 2,424 flights
- Mondays75% on time · p90 50 min · 2,374 flights
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