Go through your results for flights to Mudanjiang in China with Netflights. Although China Eastern Airlines usually has the best prices, it's best to double check what's available for your travel dates.
Flexible on dates? Conducting your search by month allows you to compare prices to Mudanjiang throughout the year. Accommodation prices will also be higher at this time of year.
So, if the flights to Mudanjiang don't work for you, you could always try searching for flights to other airports in China.
For even more options, check what other airports you could fly to Mudanjiang from. You might be able to make a saving by going from a different airport or city.