Historical on-time performance
Dallas to Ontario
1,200 miData through Dec 2025Source: US DOT · BTS
Flights on DAL–ONT arrive on time 68% of the time over the last 12 months.
On-time rate68%arrived within 15 min
p90 delay50 min1 in 10 flights is worse (tail risk)
Cancelled0.5%of scheduled flights
based on 376 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Southwest AirlinesOn-time68%Medianon timep9050 minCancel0.5%Flights376
Why flights run late
Delay causes
- Airline25%
- Weather2%
- Air traffic (NAS)5%
- Late aircraft69%
- 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 DAL → 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 44% to 84% on time.
- Middays84% on time · p90 20 min · 196 flights · limited
- Mornings81% on time · p90 20 min · 53 flights · limited
- Afternoons75% on time · p90 40 min · 357 flights
- Evenings69% on time · p90 50 min · 475 flights
- Overnights44% on time · p90 80 min · 70 flights · limited
Best day of week
On-time rates are fairly even by day on this route — ranging from 67% to 81% on time.
- Fridays81% on time · p90 30 min · 158 flights · limited
- Saturdays74% on time · p90 45 min · 160 flights · limited
- Tuesdays74% on time · p90 50 min · 160 flights · limited
- Mondays72% on time · p90 50 min · 160 flights · limited
- Wednesdays70% on time · p90 40 min · 158 flights · limited
- Thursdays69% on time · p90 45 min · 156 flights · limited
- Sundays67% on time · p90 50 min · 199 flights · limited
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