Historical on-time performance
Denver to Ontario
Flights on DEN–ONT arrive on time 74% of the time over the last 12 months.
based on 2,656 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.
- Frontier AirlinesOn-time79%Medianon timep9045 minCancel0.4%Flights520
- United AirlinesOn-time77%Medianon timep9045 minCancel0.2%Flights867
- Southwest AirlinesOn-time69%Medianon timep9050 minCancel0.3%Flights1,269
Why flights run late
Delay causes
- Airline34%
- Weather1%
- Air traffic (NAS)8%
- Late aircraft57%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline75%
- Weather0%
- Air traffic (NAS)25%
- Security0%
Most cancellations here are attributed to Airline. Shares are among 8 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 DEN → ONT
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 — 87% on time.
- Mornings87% on time · p90 15 min · 1,650 flights
- Middays82% on time · p90 30 min · 2,064 flights
- Afternoons72% on time · p90 40 min · 727 flights
- Overnights65% on time · p90 65 min · 2,012 flights
- Evenings65% on time · p90 70 min · 1,951 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 71% to 79% on time.
- Wednesdays79% on time · p90 45 min · 1,153 flights
- Tuesdays78% on time · p90 35 min · 1,152 flights
- Saturdays74% on time · p90 50 min · 1,043 flights
- Fridays73% on time · p90 40 min · 1,282 flights
- Sundays72% on time · p90 50 min · 1,234 flights
- Thursdays72% on time · p90 55 min · 1,272 flights
- Mondays71% on time · p90 50 min · 1,268 flights
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