What Is the US Airlines Policy for Unaccompanied Children on International Flights?

Every major US airline treats unaccompanied minors differently once you cross an international border — the age cutoffs, fees, and especially the connection rules all shift, and a couple of carriers block certain international routes for unaccompanied minors entirely. Here’s how the policy actually breaks down, airline by airline, specifically for international itineraries.

The One Rule Every Airline Agrees On

No US airline will fly a child under 5 years old without an accompanying adult, domestic or international, no exceptions. Above that age, every carrier’s rules diverge — sometimes sharply.

Airline-by-Airline Breakdown

United Airlines

• Mandatory unaccompanied minor (UM) service: ages 5–14.
• Optional UM service: ages 15–17, available on request.
• Fee: $150 each way, covering up to two children traveling together on the same reservation.
• Connections: children 5–7 must fly nonstop. Ages 8–14 can connect, but only through specific major hub airports (Charlotte, Washington Dulles/National, Dallas-Fort Worth, New York JFK/LaGuardia, Los Angeles, Miami, Chicago O’Hare, Philadelphia, Phoenix). The optional 15–17 service is nonstop only.
• International specifics: a valid passport is required, and United recommends booking by phone at least 72 hours ahead for international UM itineraries rather than booking online.

Delta Air Lines

• Mandatory UM service: ages 5–14.
• Optional UM service: ages 15–17.
• Fee: $150 each way, covering up to four children from the same family on one booking.
• Connections: ages 5–7 must fly nonstop, including on international codeshare partners like Air France, KLM, and Aeroméxico. Ages 8 and up can connect through Delta hub airports.
• What’s included: an employee escort between gates, a barcoded wristband scanned at each checkpoint, and access to Delta’s dedicated unaccompanied-minor waiting areas where available.

American Airlines

• Mandatory UM service: ages 5–14.
• Not required (“young adults”): ages 15–17.
• Fee: $150 each way plus applicable local taxes, charged once even if multiple UMs from the same family are traveling together.
• Connections: younger children are generally limited to nonstop flights; children roughly 8 and up can connect, but only through American’s designated hub airports (Charlotte, Washington National, Dallas-Fort Worth, New York JFK/LaGuardia, Los Angeles, Miami, Chicago O’Hare, Philadelphia, Phoenix), each of which has a dedicated UM waiting lounge.
• International specifics: American states that exact rules vary by age and destination for international itineraries, so it’s worth confirming route-specific requirements directly before booking. The accompanying parent or guardian needs government-issued ID and must complete both the UM form and any required customs/immigration paperwork at drop-off.

Alaska Airlines (“Junior Jetsetters”)

• Mandatory UM service: ages 5–12.
• Optional UM service: ages 13–17.
• Fee: $50 each way for nonstop flights, $75 each way for connecting itineraries — among the lowest UM fees of any major US carrier, and waived entirely for MVP, MVP Gold, and MVP Gold 75K elites.
• Connections: ages 5–7 must fly nonstop; ages 8 and up can connect.
• International specifics: Alaska’s own international network is narrower than the other full-service carriers — mostly Mexico and a handful of Central American/Caribbean points, plus partner codeshares for longer routes. International UM travel requires a signed Letter of Consent, a copy of the parent or guardian’s ID, and any destination-specific documentation (some countries require a health certificate or similar paperwork).

Southwest Airlines

Southwest’s UM program is domestic only. Even though Southwest flies to international destinations like Mexico, the Caribbean, and Central America, unaccompanied minors aren’t accepted on those routes at all — it’s not a matter of different international rules, international UM travel on Southwest simply isn’t offered. For eligible domestic routes: ages 5–11 require the paid service ($100 each way on the mainland, $35 for inter-island Hawaii routes), while 12 and up can fly as “Young Travelers” with no fee or formal service.

JetBlue

• Mandatory UM service: ages 5–13.
• Not required (“Young Adults”): 14 and up.
• Fee: $150 each way, for both domestic and international itineraries.
• Connections: JetBlue is the strictest of the major carriers here — unaccompanied minors are permitted only on nonstop, JetBlue-operated flights, with no connections allowed at any age. Up to 3 UMs are allowed per flight, seated near the back of the cabin for crew monitoring.
• International specifics: unaccompanied minors are not permitted at all on JetBlue flights to or from the UK or continental Europe — a standing restriction, not a new one. Caribbean and Latin America routes remain eligible under the standard nonstop-only rule.

Quick Comparison

Documents: What the Airline Needs vs. What the Destination Needs

This is the part that trips up a lot of parents: the airline’s own unaccompanied minor paperwork and the destination country’s immigration requirements are two separate things. Meeting the airline’s UM form and ID requirements doesn’t automatically mean you’ve met what the destination country expects at the border.

• For the airline: government-issued photo ID from the adult dropping the child off, a completed UM authorization form with emergency and pickup-contact information, and for international flights, the child’s valid passport (plus any visa the destination requires).
• For the destination country: many countries expect a notarized parental or guardian consent letter for a minor traveling without both parents present, even though the airline itself may not require one. This isn’t universal, but it’s common enough — some countries in Latin America and parts of Africa have specifically enforced this at immigration. Check directly with the destination country’s embassy or consulate before travel, since requirements vary by country and do change.

Practical Tips Before You Book

• Book international UM itineraries by phone, not online, for most carriers — international UM bookings often aren’t fully self-service, and calling ahead (United specifically recommends 72+ hours in advance) avoids last-minute surprises at the airport.
• Confirm connection eligibility before you buy, not after. A nonstop itinerary that becomes a connection due to a schedule change can leave a younger child suddenly ineligible to travel as booked.
• Check the destination country’s consent-letter requirements separately from the airline’s own paperwork — do this early, since notarization takes time.
• If you’re flying Alaska, remember the UM fee is waived for MVP-tier elites, which can make a real difference on a family’s overall cost if a parent already holds status.
• Double-check age cutoffs against the fare rules, not just the UM policy page — an 8-year-old eligible to connect under UM rules may still face additional restrictions tied to the specific fare or route.

The Bottom Line

Every major US carrier requires UM service starting at age 5 and treats it as optional somewhere in the mid-teens, but the similarities mostly end there. Alaska is the cheapest by a wide margin; JetBlue is the strictest on connections and blocks UK/Europe routes outright; Southwest skips international UM travel entirely despite flying international routes; and United, Delta, and American cluster around the same $150 fee but differ in which hub airports allow a connecting child to change planes. Confirm the specific route’s rules directly with the airline before booking — and separately confirm what the destination country expects at immigration, since that’s not the airline’s job to tell you.

Frequently Asked Questions