The Seattle-Tacoma International Airport reached a passenger volume of 49,849,520 people in 2018 , up 6.2 % from the previous year , according to the ACI . Owned and operated by the Port of Seattle , which has been operating since 1911 , it is located in Seattle , Washington . The 9th busiest airport in both the US and North America , it ranks 30th in the world . With the airport code SEA , it sees 540 flights every day .

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