AA has had fantastic fares out of Korea for a while. Seoul to Austin, for example, purchasing 90 days ahead will be only like $300+tax+fuel surcharges. 60 days ahead and 7 days (S class) ahead prices are available but somewhat higher. Low season (departing ICN dates) is now until 6/20, 9/7-12/10, and 2015/2/1-6/20. Basic fare for business (I) class is like $2000 only, if purchased roughly 60 days ahead. These fares will be kept at least for this month unless AA pulls away (which rarely happens in Korea). Via NRT and gateway stopover should work but AA website may give limited options.

90 days ahead price has 10 days minimum stay and others have 7 days. Maximum stay is mostly 6 months.

DL and UA has similar prices.