You might want to consider what day of the week to search for cruises, says CruiseWatch.com, a search engine for cruise price drop. According to an elaborate study that took into consideration more than 600,000 data points, cruise prices drop lowest in the middle of the week with Thursday seeing most discounts.

“Cruise prices fluctuate with demand and supply,” says Britta Bernhard, a cruise enthusiast and cofounder of CruiseWatch.com. “Most people do not realize that they can save massive amounts of money by booking at the right time.”

The search engine analyzed more than 600,000 cruise price reductions during the last year. According to the data, there were more than twice as much price drops on Thursdays than on the slowest day, Sunday. According to the study Wednesday seems to be the day of price hikes. It is by far the single day with the most price increases for cruises. Thirty-four percent more price hikes happen on a Wednesday than any other day of the week. Weekends, on the other hand, are generally quiet. There are significantly less price drops or price hikes happening on Saturdays and Sundays, with Sunday being the quietest day.

The search engine CruiseWatch.com also offers a price drop monitoring tool.