Historical on-time performance
Ontario to Las Vegas
Flights on ONT–LAS arrive on time 77% of the time over the last 12 months.
based on 2,484 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-time78%Medianon timep9065 minCancel1.1%Flights721
- Southwest AirlinesOn-time77%Medianon timep9040 minCancel0.7%Flights1,763
Why flights run late
Delay causes
- Airline16%
- Weather1%
- Air traffic (NAS)29%
- Late aircraft54%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline52%
- Weather10%
- Air traffic (NAS)38%
- Security0%
Most cancellations here are attributed to Airline. Shares are among 21 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 ONT → LAS
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 — 94% on time.
- Mornings94% on time · p90 5 min · 2,299 flights
- Middays76% on time · p90 45 min · 1,675 flights
- Overnights72% on time · p90 50 min · 1,359 flights
- Evenings69% on time · p90 60 min · 1,264 flights
- Afternoons66% on time · p90 60 min · 1,375 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 70% to 85% on time.
- Saturdays85% on time · p90 20 min · 892 flights
- Wednesdays84% on time · p90 25 min · 1,057 flights
- Tuesdays84% on time · p90 30 min · 1,030 flights
- Sundays76% on time · p90 45 min · 1,190 flights
- Mondays74% on time · p90 50 min · 1,267 flights
- Thursdays73% on time · p90 50 min · 1,258 flights
- Fridays70% on time · p90 55 min · 1,278 flights
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