$20 off USA3000 roundtrips with promo code

George Hobica, March 10, 2008
Fares from Washington DC, District of Columbia:

    As if USA3000 fares weren't cheap enough already, they're offering $10 off each one-way or $20 off round-trip fares when you use promo code SPRING on their site. Purchase now through March 17, 11.59 PM ET and travel through April 30.