Air tickets have been greatly discounted recently. You can directly search HNA's homepage through Baidu, where there are often discounted air tickets from all over the country. I bought a 230 discount ticket from Xi 'an to Dalian some time ago. If you come to live in Dalian, you can search on Alibaba's word of mouth. There are long-term rentals in short rent at all locations. I suggest you find a place to live, a family hotel next to Dalian Institute of Technology or Maritime Affairs, at around 100 every night. If you eat, you can eat next to the school, and the price is not expensive. The taxi fare in Dalian is 8 express.
In this case, the maximum cost of two days in Dalian is less than 1000, excluding round-trip air tickets.
Have fun.