World leaders are in Sydney for the APEC Talk fest.
Mr Howard later described Americans as being "bad spellers".
A White House press briefing last Thursday about US President George Bush's visit to Australia said he would arrive in "Sidney" on Tuesday evening.
Mr Bush was looking forward to "the hospitality of Sidneysiders", the statement said.
Mr Howard jokingly admonished Mr Bush's "bad White House".
"It's a predictable error for an American to make because they're bad spellers," he said.
no speedos for worl leaders