are you traveling from outside the US? if so, do you need to change the airports in Seattle?

@Ana B yes I’m traveling from outside the US. a lot of the flights available have layover in Washington.

as long as you’re not leaving the airport, you’ll be fine. you won’t cross the US border if you just stay at the airport and wait for your flight

nope, that’s incorrect @Ana . You need to have a transit visa “C” visa if you by any means are entering usa, even if it is airport

unless of course your home country is exempt from entering usa without visa

@Sep23 I googled it and apparently you’re right! I supposed US is like any other country that doesn’t make you cross the border to change a flight. indeed, @YM needs to apply for a transit visa

do u have i131 travel documents if u don’t don’t risk it

I’m actually from Japan so I think I won’t need a transit visa?

if u have a Japan passport then u good