i would like to find a cheap flight for my neice who's in america to come and see me? in london

i would like to find a cheap flight for my neice who's in america to come and see me? in london?
i would like to find cheap flights departing from washington dc to heathrow london. between 17/6/2006 to 28/8/2006. i dont mind what airline it is.
Washington, D.C. - 5 Answers
Random Answers, Critics, Comments, Opinions :
1 :
i like comparing via cheaptickets.com
2 :
I use http://www.kayak.com They don't charge you a booking fee.
3 :
Try lastminute.com flights section.
4 :
http://www.expedia.com http://www.cheaptickets.com http://www.travelocity.com http://www.orbitz.com
5 :
http://www.rhoda.joystar.com click on flights