Airport spokesman Perry Cooper told KCPQ that two airlines decided to land elsewhere Tuesday night and other flights arrived normally.
United Airlines says two of its flights were diverted to nearby Boeing Field in Seattle: Flight 371 from Chicago and Flight 407 from Denver. The airline says it provided ground transportation for passengers to Sea-Tac Airport.
Air Canada Flight 541 from Toronto also diverted to Boeing Field.
United Flight 539 from Houston diverted to San Francisco. The airline says it provided overnight hotel rooms.