Brittany Chang/Insider
- Cruise lines are seemingly adopting the budget airline model: Charge a base fare and pile on extras.
- Newer cruise ships have "more opportunities to upsell" with restaurant and entertainment options.
- Cruise companies have been raising the cost of packages like specialty dining, beverages, and WiFi.
Going on a cruise can be one of your cheapest travel options — as long as you don't sign up for too many of the optional packages and extra amenities.