Historical on-time performance
Chicago to Ontario
1,706 miData through Dec 2025Source: US DOT · BTS
Flights on MDW–ONT arrive on time 74% of the time over the last 12 months.
On-time rate74%arrived within 15 min
p90 delay40 min1 in 10 flights is worse (tail risk)
Cancelled1.3%of scheduled flights
based on 306 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Southwest AirlinesOn-time74%Medianon timep9040 minCancel1.3%Flights306
Why flights run late
Delay causes
- Airline33%
- Weather5%
- Air traffic (NAS)11%
- Late aircraft51%
- Security0%
Most delay minutes here are attributed to Late aircraft.
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly MDW → ONT
All airlines · rolling 36 months (2023-01 .. 2025-12).
Best time of day
On-time rates are fairly even by time of day on this route — ranging from 54% to 84% on time.
- Mornings84% on time · p90 20 min · 322 flights
- Middays82% on time · p90 20 min · 398 flights
- Evenings78% on time · p90 45 min · 109 flights · limited
- Afternoons67% on time · p90 50 min · 177 flights · limited
- Overnights54% on time · p90 95 min · 78 flights · limited
Best day of week
On-time rates are fairly even by day on this route — ranging from 71% to 84% on time.
- Thursdays84% on time · p90 20 min · 156 flights · limited
- Mondays79% on time · p90 25 min · 158 flights · limited
- Wednesdays79% on time · p90 25 min · 157 flights · limited
- Fridays78% on time · p90 35 min · 156 flights · limited
- Saturdays76% on time · p90 40 min · 138 flights · limited
- Tuesdays76% on time · p90 30 min · 158 flights · limited
- Sundays71% on time · p90 55 min · 161 flights · limited
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