Round Trip San Francisco to Seoul for $643

United Airlines and Expedia are offering round trip nonstop airfares from San Francisco to Seoul for $643. This is a price drop from a previous estimate of $819. The fare includes a personal item, carry-on, and one checked bag, but no seat selection or changes. If you prefer, outbound one-way fares start at $349. Travel dates vary and booking can be done via Expedia or United. For travelers seeking flexible options, regional carriers also support one-way travel into Seoul before returning from another destination.

This deal offers a solid discount of about 21% compared to the list price and covers a broad range of travel dates across several months, making it a notable price drop for international flights to Asia from the U.S.