The Prince of Wales will join global leaders at the event being held in the southern city of Krakow on Sunday.
Charles and the Duchess of Cornwall were "shocked and deeply upset" at the deaths of Mr and Mrs Kaczynski, whom they met recently, Clarence House said.
The prince and and his wife visited Poland four weeks ago and stayed as guests of the Polish president and his wife.
The duchess is unable to join Charles because of a broken left leg.
However, she will visit the Polish community's cultural centre in Hammersmith, west London, to sign a book of condolence on Friday.
Read more: http://news.bbc.co.uk/2/hi/uk_news/8621015.stm
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