Emma Sears scored a hat trick, Catarina Macario added two, and Rose Lavelle fired in a long-range hit to turn on the style.
The USWNT plays Portugal on Sunday, a few days after the United States lost the first friendly between the two teams.
Olivia Moultrie scored two goals and Sam Coffey added the third on a day when the U.S. honored the retirement of longtime star goalkeeper Alyssa Naeher.