The mad scramble was no surprise, as every event during the pontiff's September 22-27 visit to the United States has generated frenzied excitement among US Catholics.
The day before, it took all of two minutes for the 10,000 tickets to see Pope Francis' outdoor speech at Philadelphia's Independence Mall to be snatched up.
The mass will be the day after that event and will take place outdoors on Benjamin Franklin Parkway, outside the Philadelphia Museum of Art, as part of the World Meeting of Families conference.
Tickets to both events were free and available online.
The pope will arrive in Washington on September 22, meeting with President Barack Obama and addressing a joint session of Congress over the next several days.
He will then move on to New York where he will address the UN General Assembly and say mass in Madison Square Garden.
The pope's last stop will be Philadelphia, from September 26 to 27.