What are the cheapest offers to fly from Bangkok to China(return).

I have to go to china, whatever city.

Best town is Ningbo, but other town in China will do.

What is the best low budget air company to take???

AIR ASIA for sure, probably the flight to XIAMEN.

they fly to MACAU as well, but is often very expensive and flights full, because of all the Thai gamblers going to there.

During Promo-Periods, flights to XIAMEN can be as low as 699 Baht one-way plus Taxes.

You should be able to make it for about 5.000 Baht RETURN including all surcharges, fees and Taxes.

for SHANGHAI, Air India has usually the lowest fares, about 8.000 Baht plus Taxes.

If HONGKONG is considered CHINA, then u could try ORIENT THAI, they have a Promo at the moment (2.600 RETURN plus Taxes if I remember that right, just check the fly12go.com website)