Historical on-time performance
Las Vegas to Chicago
1,521 miData through May 2026Source: US DOT · BTS
Flights on LAS–MDW arrive on time 76% of the time over the last 12 months.
On-time rate76%arrived within 15 min
p90 delay30 min1 in 10 flights is worse (tail risk)
Cancelled0.8%of scheduled flights
based on 2,380 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Southwest AirlinesOn-time76%Medianon timep9030 minCancel0.8%Flights2,380
Why flights run late
Delay causes
- Airline42%
- Weather1%
- Air traffic (NAS)11%
- Late aircraft47%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline25%
- Weather70%
- Air traffic (NAS)5%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 20 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 → MDW
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 — 90% on time.
- Mornings90% on time · p90 10 min · 2,972 flights
- Middays76% on time · p90 35 min · 1,745 flights
- Overnights75% on time · p90 40 min · 657 flights
- Afternoons66% on time · p90 50 min · 1,704 flights
- Evenings62% on time · p90 65 min · 1,519 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 73% to 83% on time.
- Saturdays83% on time · p90 25 min · 864 flights
- Wednesdays81% on time · p90 30 min · 1,210 flights
- Tuesdays79% on time · p90 30 min · 1,214 flights
- Mondays76% on time · p90 35 min · 1,358 flights
- Fridays73% on time · p90 40 min · 1,360 flights
- Thursdays73% on time · p90 40 min · 1,345 flights
- Sundays73% on time · p90 45 min · 1,278 flights
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