At the moment, there are two airlines flying to Seoul. Go through the results to find the right flights for you – you can adjust the filters to see find even more flights to Seoul.
Emirates is the most popular airline that flies from London Gatwick to Seoul. But it's still worth looking at other options, as there are 12 flights to Seoul every week. If you want to broaden your search, look at flights departing from other airports.
Your flight from London Gatwick to Seoul will take at least 17 hrs 15 mins. On average, it takes 17 hrs 45 mins to fly the 8884 km distance. Take a look at flight times to see which one works best for you.
If you want to travel in June, it's best to book your flights early, as this is peak season in Seoul. The cheapest month to fly is normally May – try searching three to four months prior to then to get a bargain. You can also search by month, which will reveal the cheapest time of the week to fly.