Historical on-time performance
Denver to Ontario
819 miData through Dec 2025Source: US DOT · BTS
Flights on DEN–ONT arrive on time 72% of the time over the last 12 months.
On-time rate72%arrived within 15 min
p90 delay50 min1 in 10 flights is worse (tail risk)
Cancelled0.6%of scheduled flights
based on 2,772 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- United AirlinesOn-time75%Medianon timep9055 minCancel0.2%Flights907
- Frontier AirlinesbestOn-time79%Medianon timep9040 minCancel0.7%Flights569
- Southwest AirlinesOn-time67%Medianon timep9050 minCancel0.8%Flights1,296
Why flights run late
Delay causes
- Airline31%
- Weather1%
- Air traffic (NAS)9%
- Late aircraft59%
- 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 DEN → ONT
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 — 86% on time.
- Mornings86% on time · p90 20 min · 1,595 flights
- Middays81% on time · p90 30 min · 2,115 flights
- Afternoons73% on time · p90 40 min · 724 flights
- Evenings63% on time · p90 75 min · 2,010 flights
- Overnights62% on time · p90 65 min · 2,015 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 70% to 76% on time.
- Tuesdays76% on time · p90 40 min · 1,181 flights
- Wednesdays76% on time · p90 50 min · 1,182 flights
- Saturdays73% on time · p90 50 min · 1,042 flights
- Fridays72% on time · p90 45 min · 1,278 flights
- Thursdays71% on time · p90 55 min · 1,262 flights
- Sundays71% on time · p90 50 min · 1,232 flights
- Mondays70% on time · p90 50 min · 1,282 flights
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