Historical on-time performance
Portland to Ontario
838 miData through Dec 2025Source: US DOT · BTS
Flights on PDX–ONT arrive on time 83% of the time over the last 12 months.
On-time rate83%arrived within 15 min
p90 delay20 min1 in 10 flights is worse (tail risk)
Cancelled1.6%of scheduled flights
based on 252 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.
- SkyWest AirlinesOn-time86%Medianon timep9015 minCancel2.0%Flights153
- Alaska AirlinesOn-time78%Medianon timep9030 minCancel1.0%Flights99
Why flights run late
Delay causes
- Airline53%
- Weather0%
- Air traffic (NAS)16%
- Late aircraft31%
- Security0%
Most delay minutes here are attributed to Airline.
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly PDX → 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 — 93% on time.
- Mornings93% on time · p90 5 min · 289 flights
- Middays84% on time · p90 20 min · 153 flights · limited
- Overnights82% on time · p90 25 min · 204 flights
- Evenings81% on time · p90 30 min · 415 flights
- Afternoons81% on time · p90 25 min · 580 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 82% to 86% on time.
- Mondays86% on time · p90 20 min · 265 flights
- Saturdays85% on time · p90 20 min · 195 flights · limited
- Tuesdays84% on time · p90 20 min · 183 flights · limited
- Wednesdays84% on time · p90 20 min · 196 flights · limited
- Thursdays83% on time · p90 20 min · 245 flights
- Fridays82% on time · p90 40 min · 265 flights
- Sundays82% on time · p90 30 min · 292 flights
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