IAH (Houston) to SEA (Seattle) flights arrive on time 77% of the time. The most reliable airline on this route is Alaska Airlines at 78%. The average delay is 58 minutes. Delays on this route are most often caused by the incoming plane arriving late.
Source: Bureau of Transportation Statistics. Updated July 2026.IAH → SEA
IAH (Houston) to SEA (Seattle)
IAH → SEA on-time performance by month
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JanFebMarAprMayJunJulAugSepOctNovDec
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This route is on time most of the time. About 77% of flights arrive on schedule.
Delays on this route are most often caused by the incoming plane arriving late.
Accurate?
Airlines are roughly equal on this route — Alaska Airlines leads slightly at 78% vs United Airlines at 78%.
Airline Comparison
Alaska Airlines leads at 78% on time; United Airlines trails at 78%.
Accurate?
Good to know
Departing from IAH
79% on timeExpect ~20 min sitting on the taxiway after your gate pushes back. IAH has long runway queues.
TSA is currently ~10 min. Best time: 4 AM (about 5 min).
Arriving at SEA
80% on timeWhen flights into SEA are late, the average delay is 57 minutes. Build buffer if you have ground plans.
If connecting at SEA: TSA is ~18 min right now. Allow at least 60 minutes for a domestic connection.
Flight cancelled or delayed?
Check what Alaska Airlines owes you — refund rights, action plan, complaint email. Free.
Flying out of IAH? We'll brief you.
Delays, TSA, weather, gates — we'll let you know if something matters.
Know someone flying soon?
Send them the link — delay data, TSA waits, weather, all free.
Data last updated July 2026. Source: Bureau of Transportation Statistics.