Nonchalant was built by Boeing boats for William Boeing. Launched in 1930 from Boeing's boatyard on Coal Creek in Vancouver.

Nonchalant was subsequently owned by Henry Hoffar – the boatyard manager. In 1933 Ernest Mallory purchased the yacht for $7500 US. In 1939, she was sold to a businessman in Everett, Washington, who planned to use her for cruising Puget Sound. However, fearful that his prized new boat would be seized for wartime service, he concealed her under a commercial dock for the duration of the war. 

In 1955, Dr. Burke purchased Nonchalant and renamed her COGO. Vern Kisner purchased her in 1969 and moored her in Northern California. In1981 Ernest Brown bought Cogo and owned her for 10 years. In 1992, George Homenko purchased Cogo and changed her name back to the original Nonchalant. George Homenko moved her to San Rafael and owned her until 1998. Homenko was a very active member of the Northern California CYA Fleet (and is now a Heritage member.) 

In 1998, Nonchalant returned to Seattle and was owned by Katherine Bellows and James Mitchell. They lived aboard for 5 years. In 2007, Lorrie Snyder purchased Nonchalant and owned her until 2014. During this period, the yacht fell into disrepair and was finally seized by the marina owner – Mike Wollaston. He made repairs and eventually donated the boat to The Center for Wooden Boats in 2020. 

Nonchalant was purchased by current owner Charlie Syburg in 2023.