We've scanned every flight from Seoul to Beijing to find the best deals. If you want a cheap flight, it's best to be as flexible as you can on dates. At the moment, the cheapest flight is on 22 / May / 2019. If that day's no good for you, try searching by month to see some alternative dates.
You can use the filters on your search to see more flights and find cheaper rates – Beijing has more than one airport. So if you don't need to fly into Beijing Capital Int. Airport, it's worth checking your other options. The 903 km flight usually takes about 10 hrs 45 mins.
There are about 29 flights via Beijing every week, so you have plenty of options.
You can expect accommodation prices to be higher at this time of year too. Last-minute deals do crop up, but it's best to book everything in advance to avoid disappointment.