6. Fuel Supplements

If the price of fuel jumps, you just might be the one to pay for it. Some lines, including Royal Caribbean and Cunard, reserve the right to charge you up to $10 per person per day without prior notice — but only if the price of fuel rises above $65 per barrel. That’s regardless of whether yours is an existing booking or a new one.

The Solution: Some lines, including Carnival Cruise Line and Norwegian Cruise Line, have eliminated fuel surcharges.