IAH to SEA Flight Guide: Direct Routes, Prices, and Travel Tips

First, prepare for significant weather shifts; Houston’s intense humidity often contrasts sharply with Seattle’s cooler, mistier maritime climate, so dressing in layers is essential for a comfortable arrival. Second, to capture the most breathtaking views of Mount Rainier during your final descent, try to secure a window seat on the right side of the aircraft when flying northbound into Sea-Tac. Third, because this is a mid-length domestic flight lasting nearly five hours, consider downloading your favorite movies or podcasts beforehand, as while most carriers offer onboard entertainment, the signal can be intermittent when passing over the high-altitude Rocky Mountains. Finally, if you have extra time at IAH before departure, utilize the Skyway or Subway terminal trains to explore the wide array of dining options in other terminals, ranging from authentic Texas barbecue to high-end seafood, ensuring you are well-fed before your cross-country journey.

Flight prices for the IAH to SEA route fluctuate significantly based on the season. Generally, the summer months of June through August are the most expensive due to Seattle's peak tourist season and reliably sunny weather. Conversely, travelers can often find the cheapest fares during the late autumn and winter months, specifically January and February, when the gray skies and frequent rain in Washington State lead to a decrease in leisure travel demand.