In general, when looking for the cheapest flight to Seoul, try to choose a flight departing in March for the best deal.
In general, most flyers find the cheapest time to book a flight to Seoul is about 42 days prior.
From most locations, the cheapest flights to Seoul are found on a Tuesday. Booking a Saturday departure is usually the most expensive.
Our data shows that the cheapest Seoul flights are usually those with afternoon departure times. evening flights are often costlier.