Cruises are often one of the best values in travel. Your accommodation, transportation between destinations, meals, entertainment, and onboard amenities are usually bundled into one fare.

But when a cruise line advertises a heavily discounted sailing, the lowest price doesn't always tell the full story.

Many sale fares are the most basic option available. Travelers may give up cabin selection, dining flexibility, or perks that are included with higher fare tiers.

Some cruise lines bundle extras such as:

• Wi-Fi

• Drink packages

• Specialty dining

• Gratuities

• Onboard credit

A higher-priced fare can sometimes offer better value if those are services you'd purchase anyway.

Another common surprise is automatic gratuities. While daily service charges may seem small, they can add hundreds of dollars to a week-long cruise for two people.

Shore excursions can also significantly impact the final bill. Many cruise ports are located far from the destinations listed on the itinerary. For example, cruises visiting Rome typically dock in Civitavecchia, while Florence-bound ships often arrive in Livorno or La Spezia.

Other costs travelers should consider include:

• Alcohol and specialty drinks

• Premium coffee and bottled water

• Internet packages

• Spa treatments and specialty restaurants

• Pre-cruise hotels and transportation

• Flights and airport transfers

A cheap cruise fare isn't necessarily a bad deal. In many cases, it can still offer excellent value. The key is understanding the total cost before booking rather than focusing only on the headline price.

The Takeaway: A cruise sale can save money, but the lowest fare isn't always the best value. Compare what's included, estimate your onboard spending, and factor in transportation and excursions before deciding whether a deal is truly a bargain.