Prime Minister John Key says it was a difficult decision to make but he will not be attending the funerals of the two soldiers killed in Afghanistan.
Instead, he will go ahead with his plans to travel to the United States to watch his son, Max, play baseball for New Zealand in a major tournament.
Mr Key said he had spoken to the families of Lance Corporals Pralli Durrer and Rory Malone to explain.
"In the end it's a very, very difficult decision. I've got to let somebody down, but my son makes huge sacrifices for me and my job and, in the final analysis, I've just decided it's probably the right thing to do - to go and support him."
Max Key is in the New Zealand under-17s All Stars baseball team, the first side from New Zealand to qualify for a world series. The Senior League World Series starts tomorrow in Bangor, Maine.