Historical on-time performance
Chicago to Portland
1,739 miData through Dec 2025Source: US DOT · BTS
Flights on ORD–PDX arrive on time 76% of the time over the last 12 months.
On-time rate76%arrived within 15 min
p90 delay40 min1 in 10 flights is worse (tail risk)
Cancelled0.5%of scheduled flights
based on 2,441 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.
- Alaska AirlinesOn-time74%Medianon timep9035 minCancel0.8%Flights478
- United AirlinesOn-time78%Medianon timep9040 minCancel0.2%Flights1,356
- American AirlinesOn-time72%Medianon timep9055 minCancel1.0%Flights607
Why flights run late
Delay causes
- Airline35%
- Weather3%
- Air traffic (NAS)14%
- Late aircraft48%
- 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 ORD → PDX
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 — 84% on time.
- Mornings84% on time · p90 25 min · 2,049 flights
- Middays80% on time · p90 35 min · 1,384 flights
- Afternoons78% on time · p90 40 min · 1,830 flights
- Evenings65% on time · p90 75 min · 544 flights
- Overnights61% on time · p90 70 min · 919 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 74% to 79% on time.
- Tuesdays79% on time · p90 40 min · 929 flights
- Mondays79% on time · p90 40 min · 1,017 flights
- Saturdays78% on time · p90 40 min · 920 flights
- Thursdays77% on time · p90 40 min · 986 flights
- Wednesdays77% on time · p90 50 min · 937 flights
- Fridays74% on time · p90 50 min · 986 flights
- Sundays74% on time · p90 50 min · 951 flights
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