Airline Ancillary Fees: Disclosure, Refunds, and Family Seating

Federal rules require airlines to show you the full price of a flight before you buy, disclose the most common airline ancillary fees at the point you first see fares, and automatically refund what you paid when a flight is cancelled, significantly changed, or a service you paid for is never delivered. The refund goes back to your original form of payment, not to a voucher, and it has to arrive within a set number of days.

What Ancillary Fees Cover

Ancillary fees are charges for anything not included in the base fare. Over the past two decades, airlines unbundled services that used to be standard and started selling them individually, which is why an advertised fare can climb quickly once you add what you actually need.

The common categories:

Checked baggage, where first-bag fees on major domestic carriers now typically run $35 to $50 and second bags $45 to $60, with overweight or oversized surcharges that can reach $150 or more per bag.
Carry-on bags, free on most legacy carriers but charged by several low-cost carriers for anything beyond a small personal item.
Seat selection, including extra legroom and preferred locations, priced differently by carrier and route length.
Change and cancellation fees, largely eliminated on standard economy tickets at many carriers but still applied to basic economy and deeply discounted fares.
On-board services like meals, snacks, alcohol, and Wi-Fi, usually sold separately on domestic flights.
Agent-assisted booking by phone or ticket counter, which often adds $25 or more.

How Airlines Must Disclose Fees Before You Buy

The Advertised Price Must Be the Real Price

Any advertised airfare has to include the full amount you’ll actually pay, with all mandatory taxes and carrier-imposed surcharges baked in. A carrier can’t quote a low base fare and then add required charges deeper in the booking flow. The advertised price on a given channel has to be a price you can actually buy the ticket for on that channel.¹ The rule reaches airlines, ticket agents, and anyone else selling air transportation.

Critical Fees Have to Appear With the Fare

A separate DOT rule effective July 1, 2024 requires airlines and ticket agents to display fees for what the DOT calls “critical ancillary services” at the very first screen where fare and schedule information appears after you search. Those services are a first checked bag, a second checked bag, a carry-on bag, ticket changes, and ticket cancellations.² The disclosure has to appear whether you’re logged in or searching anonymously. The idea is that you can compare the real cost of flying two different carriers before you commit to one.

The 24-Hour Window After Booking

Every airline has to either hold your reservation at the quoted fare without payment, or let you cancel without penalty, for at least 24 hours after booking, provided you book at least seven days before departure.³ The airline must tell you on the last page of the booking process which of the two approaches it uses.

This is one of the most underused protections in air travel. It covers all fare types, including basic economy tickets that are otherwise nonrefundable. Where people get tripped up is booking less than a week before departure, which falls outside the rule.

When a Refund Is Automatic

The DOT’s automatic refund rule took effect June 25, 2024. Before it, passengers had to request refunds and wait while carriers slow-walked responses. Now the refund has to happen on its own once a trigger is met.⁴

Cancelled or Significantly Changed Flights

If the airline cancels your flight or significantly changes it and you decide not to travel on the alternative offered, you’re owed a full refund of the ticket and every ancillary fee attached to it. You don’t have to submit a request. If the airline offers rebooking or a travel credit and you reject it, or you simply don’t respond within the airline’s stated deadline, the refund obligation kicks in on its own.⁴

A “significant change” means any of the following:⁵

On a domestic flight, departure moves 3 or more hours earlier, or arrival is delayed 3 or more hours past the original schedule.
On an international flight, the same shift measured at 6 or more hours.
Your departure or arrival airport is changed.
The number of connections increases.
You’re moved to a lower class of service than you paid for.
Connections shift to different airports, or the flight uses aircraft that are less accessible for a passenger with a disability.

Services You Paid For and Didn’t Get

Airlines also have to automatically refund fees for any ancillary service you paid for but didn’t receive, so long as the failure wasn’t your fault. That covers Wi-Fi that didn’t work, a seat assignment the airline changed, lounge access that was unavailable, and any other prepaid service the carrier failed to provide.⁶ If the service fails for everyone on the flight, such as a system-wide Wi-Fi outage, the refund obligation starts as soon as the airline knows. If only certain passengers are affected, it starts once you notify the airline and the failure is confirmed.

Delayed Checked Bags

Checked baggage has its own refund trigger. File a mishandled baggage report at the airport, and if your bag isn’t delivered within a set window after the plane reaches the gate, the checked bag fee has to be refunded. The threshold is 12 hours for domestic flights and either 15 or 30 hours for international flights, depending on length.⁵ Filing that mishandled baggage report is the step people miss. Without it, the clock doesn’t start.

How Fast the Refund Has to Arrive

Airlines have seven business days to issue refunds on credit card purchases and 20 calendar days for all other payment methods, including cash, check, and debit card.⁷ The refund has to go back to the original form of payment. The airline can’t push you into a voucher or travel credit when you’re legally owed cash, and it can’t deduct a processing fee from a refund it was required to issue.

That last piece matters because it’s where carriers historically got creative. Before the automatic refund rule, vouchers and credits were offered in place of cash on the assumption most passengers wouldn’t push back. Under the current rules, if you’re owed a refund, you get your money the way you paid. The only exception is if you voluntarily agree to a different form of payment, and that alternative has to be cash-equivalent.⁷

Family Seating Without Extra Fees

Parents traveling with young children run into a specific version of the fee problem: paying extra to sit next to your child. The DOT has proposed but not finalized a rule that would require airlines to seat children aged 13 and under adjacent to at least one accompanying adult at no additional charge.⁸ While the rule is pending, the DOT maintains a public dashboard tracking which airlines have committed voluntarily. As of the latest update, Alaska Airlines, American Airlines, Frontier Airlines, Hawaiian Airlines, and JetBlue Airways guarantee adjacent seats for children 13 and under with an accompanying adult at no extra cost across all fare types, subject to availability and other limited conditions.⁹ Delta, Southwest, Spirit, and United have not made that commitment.

If you’re flying a carrier that hasn’t committed, book early and select seats at purchase. Waiting until check-in is how families get separated or pressured into a seat-selection fee they shouldn’t have to pay.

What to Do if the Airline Won’t Pay

Give the airline the first shot at fixing the problem. Carriers are required to acknowledge consumer complaints within 30 days and send a written response within 60 days.¹⁰ If that doesn’t resolve it, file with the DOT’s Office of Aviation Consumer Protection online or by mail. Include your contact information, trip details, and a clear description of what went wrong and how the airline responded.

The DOT will forward the complaint to the airline or ticket agent and require a direct response to you, with a copy to the DOT. Individual complaints are reviewed, and patterns across many complaints drive the enforcement actions and consent orders that reshape how carriers handle fees. The mailing address is Office of Aviation Consumer Protection, U.S. Department of Transportation, 1200 New Jersey Avenue SE, Washington, DC 20590.¹⁰

1
eCFR. 14 CFR 399.84 – Price Advertising and Opt-Out Provisions
2
Federal Register. Enhancing Transparency of Airline Ancillary Service Fees
3
eCFR. 14 CFR 259.5 – Customer Service Plan
4
Federal Register. Refunds and Other Consumer Protections
5
U.S. Department of Transportation. What Airline Passengers Need to Know About DOT’s Automatic Refund Rule
6
eCFR. 14 CFR 260.4 – Refunds for Ancillary Services
7
eCFR. 14 CFR Part 259 – Enhanced Protections for Airline Passengers
8
Federal Register. Family Seating in Air Transportation
9
U.S. Department of Transportation. Airline Family Seating Dashboard
10
U.S. Department of Transportation. File a Consumer Complaint