Historical on-time performance
Houston to Portland
1,825 miData through Dec 2025Source: US DOT · BTS
Flights on IAH–PDX arrive on time 79% of the time over the last 12 months.
On-time rate79%arrived within 15 min
p90 delay40 min1 in 10 flights is worse (tail risk)
Cancelled0.9%of scheduled flights
based on 1,047 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-time80%Medianon timep9040 minCancel1.1%Flights183
- United AirlinesOn-time79%Medianon timep9035 minCancel0.8%Flights864
Why flights run late
Delay causes
- Airline26%
- Weather14%
- Air traffic (NAS)12%
- 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 IAH → 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 71% to 85% on time.
- Middays85% on time · p90 25 min · 92 flights · limited
- Mornings84% on time · p90 25 min · 1,004 flights
- Evenings76% on time · p90 50 min · 470 flights
- Afternoons73% on time · p90 65 min · 380 flights
- Overnights71% on time · p90 50 min · 865 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 75% to 79% on time.
- Tuesdays79% on time · p90 35 min · 396 flights
- Sundays78% on time · p90 45 min · 404 flights
- Saturdays77% on time · p90 45 min · 404 flights
- Wednesdays77% on time · p90 40 min · 401 flights
- Fridays77% on time · p90 40 min · 403 flights
- Mondays76% on time · p90 50 min · 403 flights
- Thursdays75% on time · p90 45 min · 400 flights
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