Historical on-time performance
Houston to Seattle
Flights on IAH–SEA arrive on time 75% of the time over the last 12 months.
based on 2,107 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-time75%Medianon timep9035 minCancel1.2%Flights855
- United AirlinesOn-time75%Medianon timep9050 minCancel0.7%Flights1,252
Why flights run late
Delay causes
- Airline30%
- Weather5%
- Air traffic (NAS)23%
- Late aircraft41%
- Security1%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline53%
- Weather47%
- Air traffic (NAS)0%
- Security0%
Most cancellations here are attributed to Airline. Shares are among 19 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 IAH → SEA
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 — 84% on time.
- Mornings84% on time · p90 20 min · 2,444 flights
- Afternoons80% on time · p90 45 min · 897 flights
- Middays78% on time · p90 45 min · 518 flights
- Evenings67% on time · p90 60 min · 1,963 flights
- Overnights60% on time · p90 70 min · 443 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 73% to 80% on time.
- Tuesdays80% on time · p90 30 min · 877 flights
- Wednesdays78% on time · p90 35 min · 873 flights
- Saturdays77% on time · p90 40 min · 890 flights
- Thursdays76% on time · p90 45 min · 914 flights
- Fridays74% on time · p90 45 min · 918 flights
- Sundays74% on time · p90 50 min · 885 flights
- Mondays73% on time · p90 55 min · 908 flights
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