Hi! Im in Shanghai and plan to go to Changbaishan this Oct holiday.

At present, there is a direct flight from Shanghai to the city. I'm not clear the flights in October but maybe you can transit in Shenyang, Tianjin or Changchun. You can take plane to Vladivostok from Shenyang or Changchun, but both need to transit in Seoul. You can also take a direct flight from Beijing.