how long would it take a letter to travel from california to korea?

My husband is on an US military base in S. Korea & sometimes it takes 2-4 weeks to get to him. It just depends on when the plane leaves in regards & when your letter gets there. Mine to him have to go from Arkansas to California to S. Korea. And it doesn't matter if you send it prority, kuz the plane isn't leaving any sooner if you do lol. I think they only go over like 2 or 3x a month, but not sure. Anyway the longest its taken so far was almost 6 wks. Hope that helps, good luck!

It normally takes 7-10 days for me to receive a letter from Los Angeles to Korea by standard air mail.

It took little over a week in my experience.