How often are IAH to SEA flights on time?

Flights from Houston (IAH) to Seattle (SEA) arrive on time 85% of the time across 11,662 flights of official data.

Which airline is most reliable on the IAH to SEA route?

Alaska Airlines has the best on-time record on this route at 87% across 4,645 flights.

Route reliability

Flights from Houston to Seattle arrive on time 85% of the time across 11,662 flights. Here’s how each airline really performs.

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On-time rate

11,662 flights

Airline	On-time	Flights
Alaska Airlines	87%	4,645
United Airlines	84%	7,017

On-time = arrived within 15 minutes of schedule, per BTS TranStats. Compare the reverse leg SEA → IAH.

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Score real IAH–SEA flights on reliability, weather, and connection safety — not just price.

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