Information is based on travel restrictions for travel to Seattle/Tacoma Intl within the United States Most visitors from United States need to provide a negative COVID-19 test result and/or quarantine to enter Seattle/Tacoma Intl. COVID-19 testing requirements Visitors from United States must present a negative RT-PCR (NAAT) or Antigen (quick-test) test taken 24 hours before departing to Seattle/Tacoma Intl. Quarantine requirements Visitors from United States are not required to quarantine after entering Seattle/Tacoma Intl.