What is the cheapest time to book a cruise? Prospective cruisers can usually find "a lot of good deals at the beginning of the year" during wave season, Goldberg-Glazer said. That period typically lasts from January until March.

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Cruise lines often discount their prices a month or two before sailing to fill vacant cabins. However, it's worth noting that a last-minute cruise doesn't always offer the most savings to travelers. Those who plan far ahead may be able to save even more.