How long is a 'stopover'?
 

Traveling from ATL to ICH on Korean Air and wish to stopover in Seoul. Does anyone know if any time limit on such stopovers? Like one week, or one month? I'll probably need to pay extra US$100 to make the stop/change tix, but that's OK if i can stay in Seoul a few days.

How long is a piece of string?

A stopover is as long as you want it to be, as long as your return flight is within the limits of the fare -- usually 6 or 12 months, though sometimes less.

(I have no clue what/where "ICH" is, other than a German pronoun. If by chance you mean Incheon, the airport in Incheon is, in fact, the airport for Seoul.)

UA used to offer a free stopover on roundtrip flights. A stopover was a defined as not more than 72 hours. I expect every airline has its own definitions.

Stopover is basically depends upon the Airlines. They decide this as per their benefits. They synchronizes their different routes flights and Adjust stopover timings.

On AA, it is 24 hours for international flights. This could be just for award tickets but I don't think so.

On AA, a connection is anything under 24 hours. Twenty-four hours or more becomes a stopover and prices out differently.

Oh, right you are Don. Of course it's ICN near Seoul, Korea. Anyway, here is what i learned after speaking to Air Korea, in person. Since i bought the lowest priced economy ticket (more than 3 economy style tickets were on offer) i therefore got very fewest possible perks. And, although no mention was made on the buying ticket page, that price expires at the end of April.

I would need to inform the airline office before the last day of April to get that same price ticket after the stopover. And of course, inform them of the date of the new return ticket from ICN. But i could 'stopover' in Seoul until 90 days elapsed, essentially till September, but i only wanted 5 days.

All told, including the $100 stopover fee, extra costs include the new ticket fare, and other fees totaling $300. Since my gf won't know her work schedule till mid-May, i can't see spending that $$ and possibly only seeing Seoul by myself, so i won't be stoping over. I'll just catch my connecting flight at ICN onto CNX. Easy-peasy and overall, quite cheap. Hope the bibimbap is hot.