It is Asia's second confirmed case of the disease. Hong Kong officials ordered a weeklong quarantine on Friday for hundreds of hotel guests and workers after a tourist from Mexico tested positive for swine flu. The 25-year-old man was isolated at a hospital and was in stable condition.
The South Korean woman has been listed as a probable case since Tuesday. Health officials said she has recovered enough to consider being discharged from a hospital where she remains quarantined.
Authorities are testing another woman - who lived with the now-confirmed patient and drove her home from the airport Sunday - for swine flu.
Yonhap news agency said the two women are nuns living in a convent near Seoul, but officials refused to confirm the report, citing privacy.
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