International Flight Child Travel Consent: Airline & Destination Guide

This is a summary of the current published rule. Confirm it on the airline’s own page before you travel.

This overview is for families flying internationally with a child, including one-parent trips, children traveling alone, and travel with grandparents, stepparents, or another adult.

It compares American Airlines, Delta Air Lines, United Airlines, Southwest Airlines, Alaska Airlines, JetBlue, Frontier Airlines, Hawaiian Airlines, Allegiant, Sun Country Airlines, and Air Canada. Four of those carriers have their own pages: American Airlines, Delta, Frontier Canada, and Air Canada.

An airline rule is what that carrier publishes about boarding, documents, or Unaccompanied Minor service. Most of the 11 airlines do not publish a universal parental travel-consent form.

American Airlines says travelers under 18 flying internationally without both parents may be required to carry relationship evidence and a Letter of Consent. Delta surfaces country-specific child-travel regulations rather than one Delta consent form. United directs travelers to itinerary-specific documents through its Travel-Ready Center.

A destination government rule is what a country requires for entry, exit, or transit. Destination rules often control even when the airline has no branded consent form. Compare current destination layers in Child Travel Consent Requirements by Country.

Southwest Airlines says some countries require additional documentation for children and recommends verifying with the relevant government, consulate, or embassy. Alaska Airlines requires international travelers to satisfy destination-specific travel-document requirements and still carry the physical documents. Air Canada tells parents to verify child entry and exit requirements with the relevant destination authorities.

Parental travel consent is permission for the child to take the trip. It is not a passport, a visa, or an airline Unaccompanied Minor form.

Frontier Airlines publishes detailed Canada-specific child-document guidance, including one-parent authorization letters. Those Canada rules are not a universal Frontier requirement for every destination. See Frontier Airlines Child Travel Documents for Canada.

An airline Unaccompanied Minor form usually manages the airline's custody, handoff, pickup, and supervision process. A parental travel-consent letter shows permission for the child to travel and may be requested by a carrier, border official, destination government, or other recipient. One does not automatically replace the other. See Airline Unaccompanied Minor Form vs Parental Travel Consent.

Southwest's Unaccompanied Minor and Young Traveler rules, including the current international-travel restriction, are carrier service rules. Allegiant's companion-age rule and Sun Country's Rule 50 international-accompaniment restriction are also carrier acceptance rules, not parental-consent letters.

Who must sign depends on the actual document: the airline form, the destination consent letter, a custody order, or a government exit process. Do not assume every international one-parent flight uses the same signer.

One-parent flying is covered in Flying Internationally With a Child With One Parent. Travel with grandparents, stepparents, or another adult is covered in Flying With Grandparents, Stepparents or Another Adult.

Notarization is not a universal airline child-travel rule. American's Letter of Consent language is conditional. Delta's country pages and 12–17 proof-of-permission concept are not a rule that every Delta international minor must have a notarized letter. Frontier's Canada authorization letters do not currently state a blanket notarization requirement.

Remote online notarization is not applicable until the actual required document calls for notarization, the signer is eligible, and the recipient will accept that format. Airline Unaccompanied Minor service does not automatically create a notary CTA.

Passport, visa, and many destination exit processes still require original or government-issued documents. An airline app check does not replace carrying the physical travel documents Alaska and Hawaiian currently tell international travelers to bring.

This table summarizes the airline positions below. It is not a substitute for the official airline page or the destination’s own rule.

Citizenship, dual nationality, and residency can change which destination entry or exit rule applies. An airline boarding rule does not replace those government rules.

Already at the airport, leaving today, or holding a form the airline just handed you? Identify the exact missing document first. Use the Airport Emergency Child Travel Consent Guide.

Check the official page again before you travel.