Historical on-time performance
Ontario to Portland
838 miData through Dec 2025Source: US DOT · BTS
Flights on ONT–PDX arrive on time 89% of the time over the last 12 months.
On-time rate89%arrived within 15 min
p90 delay10 min1 in 10 flights is worse (tail risk)
Cancelled1.2%of scheduled flights
based on 251 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-time89%Medianon timep9010 minCancel1.3%Flights153
- Alaska AirlinesOn-time89%Medianon timep9020 minCancel1.0%Flights98
Why flights run late
Delay causes
- Airline39%
- Weather11%
- Air traffic (NAS)17%
- Late aircraft32%
- 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 ONT → PDX
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 76% to 92% on time.
- Mornings92% on time · p90 10 min · 449 flights
- Middays91% on time · p90 10 min · 306 flights
- Evenings82% on time · p90 25 min · 595 flights
- Overnights77% on time · p90 25 min · 65 flights · limited
- Afternoons76% on time · p90 40 min · 226 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 83% to 90% on time.
- Saturdays90% on time · p90 15 min · 203 flights
- Wednesdays87% on time · p90 15 min · 187 flights · limited
- Tuesdays86% on time · p90 20 min · 193 flights · limited
- Thursdays84% on time · p90 20 min · 234 flights
- Mondays84% on time · p90 20 min · 275 flights
- Sundays84% on time · p90 25 min · 279 flights
- Fridays83% on time · p90 35 min · 270 flights
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