The Pyeongchang Winter Games will be held from February 9-25 only 80 kilometres from the heavily guarded border with the nuclear-armed North.
French and Austrian officials last week raised the prospect of not sending athletes as US and North Korean leaders intensified their war of words.
Seoul's foreign ministry played down the security fears, saying it is working through diplomatic channels to reassure the participants.
"The South Korean government is doing its utmost to ensure that the 2018 Pyeongchang Winter Olympics and Paralympics will be safe," said ministry spokesman Noh Kyu- Duk.
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Tensions have soared following Pyongyang's sixth and most powerful nuclear test on September 3, which triggered a heated volley of threats and personal insults between US President Donald Trump and North Korean leader Kim Jong-Un.
Trump has threatened to "totally destroy" North Korea, while Kim hit back with a personal attack on Trump -- branding him "mentally deranged" and warning he would pay dearly for his threats.
In the latest episode of the saga, the North's foreign minister claimed on Monday that Trump's latest comments amounted to a declaration of war.
The South has successfully staged several international sporting events including the 2002 football World Cup despite decades of military tensions on the peninsula.
The 1988 Seoul summer Olympics took place only months after a bomb planted by North Korean agents killed all 115 people on board a South Korean plane, in an apparent attempt to scare off foreign spectators and contestants.
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