Details of the agreements were not available, but hornist Gregory Drone said in a statement that orchestra's new contract "provides improvements in wages and benefits."
The agreement "continues to demonstrate the opera's commitment to maintaining and improving the quality of the orchestra," he added.
WNO president Michael R. Sonnenreich said, "Washington National Opera's relationship with the musicians' unions is very positive. The contracts are very realistic and represent the understanding of both the musicians' needs and the needs of the performing-arts industry, as well as the challenges that the arts are facing in these difficult economic times."