Great low fares to China from Sydney or Melbourne, flying China Southern. These are via Guangzhou or Shenzhen, and most have a long stop on the return leg (some have long stops in both directions) - remember that China Southern will provide you with a free hotel room if you have a stop over 8 hours. 2 x 23kg checked bags included. Dates are late February and March 2024. Use Google Flights to search out the cheapest dates, then you can book from there.
Melbourne to Chendgu $550
Melbourne to Dalian $550
Melbourne to Harbin $550
Melbourne to Shenyang $550
Melbourne to Qingdao $550
Melbourne to Xi'An $550
Sydney to Chengdu $573
Sydney to Dalian $573
Sydney to Harbin $573
Sydney to Shenyang $573
Sydney to Qingdao $573
Sydney to Xi'An $573
FYI you have to click through to the final page to see the prices listed (they are slightly higher in the grid view).
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Can you stop over at GuangZhou?(multi stay)