Historical on-time performance
Chicago to Los Angeles
1,751 miData through Dec 2025Source: US DOT · BTS
Flights on MDW–LAX arrive on time 76% of the time over the last 12 months.
On-time rate76%arrived within 15 min
p90 delay40 min1 in 10 flights is worse (tail risk)
Cancelled0.7%of scheduled flights
based on 1,360 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 timep9040 minCancel0.7%Flights1,360
Why flights run late
Delay causes
- Airline42%
- Weather2%
- Air traffic (NAS)14%
- Late aircraft41%
- Security1%
Most delay minutes here are attributed to Airline.
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly MDW → LAX
All airlines · rolling 36 months (2023-01 .. 2025-12).
Best time of day
Mornings are the most reliable time of day to fly this route — 84% on time.
- Mornings84% on time · p90 20 min · 1,401 flights
- Middays77% on time · p90 30 min · 593 flights
- Afternoons66% on time · p90 45 min · 503 flights
- Evenings62% on time · p90 60 min · 660 flights
- Overnights59% on time · p90 65 min · 1,017 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 68% to 74% on time.
- Saturdays74% on time · p90 35 min · 462 flights
- Wednesdays74% on time · p90 40 min · 624 flights
- Tuesdays73% on time · p90 45 min · 629 flights
- Mondays71% on time · p90 40 min · 637 flights
- Thursdays70% on time · p90 55 min · 623 flights
- Fridays68% on time · p90 45 min · 633 flights
- Sundays68% on time · p90 55 min · 566 flights
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