Where can i find cheap plane tickets from DC to MN?

The best place for cheap tickets is Priceline.com. Type in where you want to go and when and then "pick your own price" They normally say that 30% off can be an expected savings; however, I have saved over 50%. Whatever the regular price is, request a price about 1/2 of that. Keep in mind there are extra surcharges that are not reflected in some prices. You won't be able to choose your airline or time of travel but the price might be worth it. Bid LOW! If they don't accept your offer you're not out anything.