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Book United Airlines cheap flights to 300+ destinations worldwide on our official site. Find our most popular flight deals and earn MileagePlus® miles.

Book cheap flights to Seattle (SEA) with United Airlines. Enjoy all the in-flight perks on your Seattle flight, including speed Wi-Fi.

Check in for your United or United Express-operated flight, depending on where you are in your travel experience.

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Airport information Learn about our airport check-in process, expedited security programs like TSA PreCheck® and our United Clubs.

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Enjoy discounts on over 4,500 flights to 300+ destinations. Some United deals also let you earn extra miles.