请问从底特律春节回国的话机票哪里买比较便宜？哪家旅行社比较好？

谢谢了。

You can try to buy thre ticket online. No middle man charge.

which website is good?

http://www.cheapflights.com/
Cheap Airline Tickets – book discount airfares at Cheapflights.com

Expedia Travel -- discount airfare, flights, hotels, cars, vacations, cruises, activities, maps
http://www.expedia.com/daily/home/default.asp?mcecid=ipsplash_ca

Not sure if they are the cheapest but you can do a search online.

http://backchina.travelsuperlink.com/

very useful web site. you can find many travel agents there.