How often are SEA to IAH flights on time?

Flights from Seattle (SEA) to Houston (IAH) arrive on time 87% of the time across 11,444 flights of official data.

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

United Airlines has the best on-time record on this route at 90% across 6,885 flights.

Route reliability

Flights from Seattle to Houston arrive on time 87% of the time across 11,444 flights. Here’s how each airline really performs.

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On-time rate

11,444 flights

Airline	On-time	Flights
United Airlines	90%	6,885
Alaska Airlines	84%	4,559

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

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