On February 17, 2010, Ilgauskas, along with a 2010 first round pick and the rights to Emir Preldžič, was traded from the Cavaliers to the Washington Wizards as part of a three-team, six-player trade that sent Antawn Jamison from Washington to Cleveland, Al Thornton from the Los Angeles Clippers to Washington, Drew Gooden from Washington to Los Angeles, and Sebastian Telfair from Los Angeles to Cleveland. On February 25, 2010, the Wizards bought out his contract, making him a free agent. Ilgauskas did not play in any games for the Wizards. It was possible for Ilgauskas to return to the Cavaliers, but only after a 30-day waiting period policy required for players traded from their former teams after being bought out of their contract by their new team. He was still free to sign with any other team.