Beijing imposed a boycott from March 15 on Chinese tour groups visiting the South in a spat over the US Terminal High Altitude Area Defense (THAAD) system.
Washington and Seoul say it is purely to defend against threats from nuclear-armed North Korea, but Beijing fears it could undermine its own nuclear deterrent and has reacted with fury, imposing a series of measures seen as economic retaliation.
April was the first full month of the ban, and saw a total of 227,811 Chinese tourists visiting South Korea, down 66.6 percent on the 682,318 a year earlier, according to the state-run Korea Tourism Organization (KTO).
The tumbling figures have taken a heavy toll on duty-free shops in South Korea.
Sales to Chinese visitors were down 40 percent at Lotte Duty Free, a Lotte spokesman said previously, adding that they usually make up 70 per cent of the company's overall sales.
The South Korean retail giant has been trying to make up for the loss but has been unsuccessful so far, he said, adding: "I'm not hopeful of a recovery anytime soon."
Its accumulated losses as a result are reportedly expected to hit $1 billion in the first half of this year alone.
South Korea has been struggling to fill the gap with promotional campaigns to attract more visitors from other countries, mainly from Japan and those in Southeast Asia.
But Japanese travellers have also been put off by "negative media reports" about rising regional tensions over the North, KTO said, with their numbers falling 5.4 percent year-on-year in April.
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