Earlier, the official, Jacek Sasin, had said a delay might be possible because of a huge ash cloud from an Icelandic volcano that has forced the closure of airports across northern Europe, including all but two of Poland's airports, Reuters reported.
"A scenario to delay, that kind of scenario does not exist. It's not being discussed... This would be the last resort. For now we're monitoring the situation," Sasin told reporters, adding a meeting on the issue was planned later Friday. U.S. President Barack Obama and dozens of other world leaders are due to attend the funeral at Krakow's Wawel cathedral in southern Poland. Krakow airport was still open on Friday morning.
Kaczynski, his wife and scores of senior Polish officials were killed in a plane crash last Saturday, plunging Poland into deep mourning.