The number you see on the search results page is a promise with footnotes. Book a hotel room or a flight and the price often grows between the first click and the final one, sometimes by a little, sometimes enough to change which option was actually the cheaper choice. Federal regulators have been tinkering with the rules on when businesses have to show you the real total, and the rules for hotels and the rules for airlines have recently moved in opposite directions. Knowing which fees must be disclosed, and when, can save you from an unpleasant surprise at checkout.

Close view of a traveler's hands beside a laptop checkout screen, reviewing a booking total against the nightly rate before paying.
A traveler reviews a checkout screen on a laptop, comparing a nightly rate against a final total that includes added fees.

The Federal Trade Commission has flagged this pattern directly, warning in a consumer alert that hidden fees can add real cost to holiday travel bookings [1]. The gap between a base rate and a total price is not new, but the rules governing how that gap must be disclosed have shifted meaningfully for lodging, and loosened for airlines.

For short-term lodging, the shift favors travelers. The FTC's Rule on Unfair or Deceptive Fees took effect May 12, 2025, and it covers hotels, motels, inns, and short-term or vacation rentals [4]. Under that rule, a business advertising short-term lodging has to clearly show the total price upfront, meaning the full amount you must pay plus any mandatory add-on, such as a cleaning fee. A booking that comes to $1,030 might break down as an $880 nightly rate plus a $150 cleaning fee, but the rule requires that the $1,030 figure be the one that stands out, not buried under a breakdown that competes for attention [4].

That said, the lodging rule is a disclosure rule, not a price cap. It does not stop a property from charging a steep cleaning fee or a resort fee. It simply requires that fee be folded into the number shown before you commit, rather than appearing as a surprise line item once you have already typed in your card number.

What can still sit outside the total

Some charges are allowed to live outside that headline total, including taxes and other government charges, shipping fees, and the cost of any optional good or service you choose to add. The rule still requires businesses to spell out the nature, purpose and amount of those charges before you agree to pay [4]. An optional fee is not automatically a hidden one, it is simply a choice you make, which means the real work for travelers is reading the add-on screens rather than assuming the first total is the final total.

Airline disclosure rules moved the other direction

Airlines are a different story. A federal rule from 2024 would have required carriers to show exact costs for checked bags, carry-on luggage and change fees right alongside the fare in search results. The Fifth Circuit Court of Appeals struck that rule down in February, and a revised regulation took effect July 2, 2026 [6]. Under the current rules, a flight listing can simply note that additional baggage or service fees may apply, pointing travelers to a separate page rather than listing the dollar amount up front.

Airlines are still required to disclose those ancillary charges before you complete a purchase, so the fee information has not vanished entirely [6]. It has simply moved later in the process, and some of the obligations that applied to online travel agencies and metasearch sites under the 2024 rule, like passing along detailed fee data or showing fees after a click-through, were removed as well. That means the fee picture you get on a third-party booking site may look noticeably different from what you would see booking directly through an airline.

A short list of questions worth asking before you pay

Before entering payment information on any travel booking, a few questions can clarify what you are actually agreeing to pay. Does the total include mandatory charges like a cleaning fee? What are the nature, purpose and amount of anything listed separately from the total? And for flights, which optional services, such as a checked bag, a seat assignment or an itinerary change, are missing from the fare shown on screen?

  • Compare the full total shown before checkout, not just the nightly rate or base fare, across the sites you are considering.
  • Check add-on screens for checked bags, seat selection and change fees before assuming the first number is final.

Red flags worth slowing down for

A nightly rate advertised cleanly, with a cleaning fee that only appears once you reach checkout, is one sign worth noticing. So is a booking flow where fee detail stays vague until very late in the process, whether that is a lodging site or an airline's own page. Neither pattern necessarily means something improper is happening, but both are moments to pause, scroll back through the listing, and confirm what you are actually agreeing to.

None of this amounts to a guarantee that any given booking will be free of surprises, and the rules described here cover federal disclosure requirements rather than state law or the practices of every individual booking platform. For questions about a specific charge or a dispute over a fee you believe was not properly disclosed, the FTC's consumer resources are a reasonable place to start before assuming the worst or simply paying and moving on.

Please seek a professional. This article is general information, not financial, tax or insurance advice. Please seek a licensed financial, tax or insurance professional about your own situation.