The house flag of the United Baltic Corporation Ltd, London. A white rectangular flag with a red foul anchor placed aslant. The red letters 'UBC' placed in the lower left hand corner. The flag is made of a wool and synthetic fibre bunting. It has a cotton hoist and is machine sewn. A rope and two Inglefield clips is attached. The house flag was based on that of the East Asiatic Company of which the company was originally a subsidiary.

The United Baltic Corporation was founded in 1919 as a partnership between the East Asiatic Company, Copenhagen and Andrew Weir and Company, London. Each company owned a 50% share of the United Baltic Corporation. The corporation was established to run passenger and cargo ships between the Baltic and London. Emigrants from Eastern Europe would often use the United Baltic Corporation’s ships as the first leg in their journey to America. The company also began a service to Newcastle in the 1930s.

During World War II the United Baltic Corporation’s services from London to the Baltic were suspended, however the company continued to help manage the East Asiatic Company’s ships, 11 of which were eventually lost in the war. After the war, services to Poland continued as well as new services to Finland. Services to other regions of the Baltic, however, could not resume due to Russian control of those ports. The company then began operating their Poland-London service in conjunction with the company Polish Ocean Liners. United Baltic eventually began focusing more on cargo service and less on passenger service, and sold its last passenger ship in 1947. In 1982, Andrew Weir and Company purchased the East Asiatic Company’s 50% of United Baltic. The company still operates today as a subsidiary of Andrew Weir and Company, which operates passenger cruises and ship management services.