layover flights

[fiftymiler]

Hello,
so here is my situation. I recently became a permanent resident of the US ( green card) and I want to travel back to my country of citizenship( Vietnam). My flight will have a long layover in Korea for 20 hours on the way back (US to Vietnam). My question is: Is it okay to go out of the airport during the layover? Do I need a visa or something to go outside?

Regards,
fiftymiler

[immihelp]

You need to check the visa requirements of Korea.

This is U.S. immigration forum.

[kotgm]

My wife is Ecuadorian. Can she fly from the Dominican Republic to the Miami airport just to catch the next flight to Ecuador? It's cheaper and she is not trying to enter the U.S.


Thank you!