Flight Deals from San Francisco to Seoul from $408

Fly from San Francisco to Seoul in early January and late August for the best prices; expect peak costs in mid-December and late March.

When planning your flights from San Francisco to Seoul, keep in mind that the most expensive times are typically from mid-December to early January and again in late March through early April, with peak prices reaching up to around $1900. On the other hand, you can find the lowest fares from early January until early February and again from late August to mid-September, with prices dipping to around $830. Notably, December shows a sharp price increase right before the holidays, while early January offers a sudden drop, making these periods significant for budget travelers.

Book your flight from San Francisco to Seoul 40 to 66 days before departure for the best prices.

When planning your trip from San Francisco to Seoul, aim to book your flight between 40 to 66 days before departure, as this is when prices are generally lower, around $996. The lowest prices can be found about 50 days prior. If you book earlier, you may encounter prices as high as $1,243, which is significantly more expensive. While prices remain relatively stable during this 40 to 66-day window, they begin to increase as the departure date approaches, reaching around $1,130 shortly before your flight. It's best to avoid waiting until the last minute, as prices are likely to be higher in that scenario.