Unaccompanied Minor: Airline Rules, Ages and Fees

What is an unaccompanied minor?

It is a child flying without a parent or guardian — and on most airlines it is not a choice. Between the ages of 5 and 14 on American, Delta and United, the service is mandatory. The airline will not board a child in that range without it.

What you are paying for is a documented chain of custody. A parent checks the child in at the counter, receives a gate pass to walk them to the gate, and waits until the flight is in the air. At the far end, the child is released only to the specific adult you named at booking, who must show photo ID to take custody.

Fees and ages by airline

Airline	Fee each way	Ages accepted	Key restriction
Delta	$150	5–14 mandatory, 15–17 optional	Ages 5–7 nonstop only. Fee covers up to 4 children.
American	$150	5–14 mandatory, 15–17 optional	Covers siblings on the same booking.
United	$150	5–14 mandatory, 15–17 optional	Nonstop flights only, on United or United Express.
Southwest	$100	5–11 only	No connections. No international. Refundable.
Hawaiian	$35 inter-island / $100 to mainland	Varies	Per flight segment, up to 2 children.
Frontier	No service	—	Under-15s must travel with a ticketed adult.
Sun Country	No service	—	Does not offer the service.

The fee is per direction, not per trip. A child flying to a grandparent and home again costs $300 in service fees on the big three, on top of the airfare. It is charged even if the child holds elite status.

Southwest works differently, and the age cut-off catches people out

Southwest's unaccompanied minor programme runs from age 5 to age 11 — and stops there. A 12-year-old is not an unaccompanied minor on Southwest; they are a Young Traveler, which is a separate policy with no escort service. On American, Delta and United, that same 12-year-old would still be inside the mandatory unaccompanied minor band.

That gap is where families get caught. A child who needs supervision on one airline is expected to manage alone on another.

Southwest also has the tightest routing rules of any carrier here. Unaccompanied minors are accepted only on nonstop flights or same-plane service — a flight that stops but does not change aircraft or flight number. No connections, at any age. No international routes. No Getaways vacation bookings.

Two things in Southwest's favour, though. The $100 fee is refundable if you cancel, if the flight is cancelled and you choose not to rebook, or if the child ends up accompanied by someone aged 12 or over. And unlike Delta and American, you can book a Southwest unaccompanied minor online rather than by phone.

One thing to know honestly: Southwest states plainly that a flight attendant will check on the child periodically as duties allow, but will not monitor them continuously during the flight. That is a fair description of what most airlines actually do, but Southwest is the one that says it out loud.

The routing rules matter more than the fee

This is where bookings get rejected, usually after the family has already chosen the flight.

• Ages 5 to 7 are generally restricted to nonstop flights on the major carriers.
• Ages 8 and up may take connections on Delta and American — but only through permitted hub airports, and never more than one connection.
• United accepts nonstop flights only, at any age.
• Southwest accepts nonstop or same-plane only, at any age.
• The last flight of the day is usually blocked. If it is cancelled or the connection is missed, the child would be stranded overnight, so airlines refuse to accept unaccompanied minors on it.

Check the routing rules before you pick the flight, not after. A cheap connecting itinerary that would be fine for an adult may be flatly unbookable for a child.

You usually cannot book this online

Delta requires you to call reservations, because an agent has to verify the itinerary against the routing restrictions. American requires the same. Southwest is the exception and allows online booking.

Wherever you book, the child cannot check in online or at a kiosk. You go to the counter, every time.

What happens on the day

1. Check in at the counter with the child. Bring proof of the child's age — Southwest requires a birth certificate or other valid ID at the counter. You complete the unaccompanied minor form, which stays with the child.
2. Get a gate pass. This lets you through security to the gate. You need a physical, valid photo ID that meets TSA requirements — Delta specifies that a digital ID is not accepted for a gate pass.
3. Get to the gate early. Southwest requires the escorting adult to have the child at the gate no less than 45 minutes before departure.
4. Wait until the aircraft is off the ground. You are not free to leave when they board. If the flight returns to the gate, the airline needs you there.
5. Stay reachable by phone for the whole journey.
6. At the other end, the collecting adult needs their own gate pass and photo ID. The child is released to that named person and no one else.

The mistake that costs the most

Booking the flight before checking the airline's rules. Parents pick a convenient connection, pay for it, and then discover that a 6-year-old cannot fly it — or that their 12-year-old, who needed an escort last month on Delta, will get none on Southwest.

Airline first. Then age band. Then routing. Then flight.