Historical on-time performance
Houston to Seattle
1,874 miData through Dec 2025Source: US DOT · BTS
Flights on IAH–SEA arrive on time 73% of the time over the last 12 months.
On-time rate73%arrived within 15 min
p90 delay50 min1 in 10 flights is worse (tail risk)
Cancelled1.2%of scheduled flights
based on 2,113 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-time72%Medianon timep9045 minCancel1.9%Flights857
- United AirlinesOn-time73%Medianon timep9050 minCancel0.8%Flights1,256
Why flights run late
Delay causes
- Airline31%
- Weather4%
- Air traffic (NAS)23%
- Late aircraft42%
- 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 → SEA
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 20 min · 2,445 flights
- Afternoons78% on time · p90 50 min · 779 flights
- Middays78% on time · p90 50 min · 491 flights
- Evenings67% on time · p90 60 min · 2,076 flights
- Overnights57% on time · p90 75 min · 467 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 72% to 79% on time.
- Tuesdays79% on time · p90 30 min · 883 flights
- Saturdays77% on time · p90 40 min · 888 flights
- Wednesdays77% on time · p90 35 min · 880 flights
- Thursdays74% on time · p90 50 min · 903 flights
- Fridays73% on time · p90 50 min · 908 flights
- Mondays73% on time · p90 55 min · 912 flights
- Sundays72% on time · p90 50 min · 884 flights
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