She made one voyage as an "extra ship" for the British East India Company (EIC).

Sarah Christiana reached the Cape of Good Hope on 14 January 1799, and arrived at Madras on 9 May.

Homeward bound, she reached St Helena on 18 July, was at Galway Bay on 8 September, and arrived at The Downs on 29 October.

The Register of Shipping for 1801 showed Sarah Christiana's master as R. Ayton, her owner as Keighly, and her trade as London–Jamaica.

She was part of a convoy under escort by HMS Seahorse that also included General Stuart, Northampton, Manship, Comet, Sovereign, Caledonia, Ann, Princess Mary, Varuna, Carron, Elizabeth, Monarch, and Friendship.

Homeward bound, she was at Kedgeree on 31 March, reached St Helena on 7 July, and arrived at The Downs on 4 September.

They would carry supplies and troops to the Cape, and then continue on their voyages, in Sarah Christiana's case, Madras and Bengal.

[2] After the Dutch Governor Jansens signed a capitulation on 18 January 1806, and the British established control of the Cape Colony, HMS Belliqueux escorted the East Indiamen William Pitt, Jane, Duchess of Gordon, Sir William Pulteney, Comet to Madras.

The convoy included the Northampton, Streatham, Europe, Union, Glory, and Sarah Christiana.

The advertisement gave the name of her master as David Briggs and stated that she was fully equipped for her next voyage.

[11] A second advertisement in the same publication, dated 17 June, described her as fully repaired for a voyage, and lying at a dockyard in Limehouse.