Youngest Age to Fly Alone: Every Airline's Minimum
Compare the minimum age requirements for unaccompanied minors across all major airlines. Find which airlines accept the youngest solo travelers in 2026.
Overview
The youngest age a child can fly alone varies by airline, ranging from 4 years old (Air France) to 14 years old (Virgin Atlantic). Most major US airlines — including Delta, United, American, and Southwest — accept unaccompanied minors from age 5. However, “flying alone” requires enrolling in the airline's Unaccompanied Minor (UM) program, which provides supervised escort service from check-in through arrival.
Children below the minimum age cannot fly without an adult (18+) on the same flight. The UM program is mandatory up to a certain age (typically 14), after which teens can fly completely solo without the service. Below is a complete comparison of minimum age requirements across 10 major airlines, sorted from youngest to oldest.
Key finding: Air France accepts the youngest solo travelers at age 4, while Virgin Atlantic requires children to be at least 14. Among US carriers, Southwest has the lowest “solo age” threshold at 12, meaning teens can fly without UM service from age 12 onward.
Airline Minimum Age Requirements (Youngest to Oldest)
| # | Airline | Min Age | Mandatory Range | Solo Age |
|---|---|---|---|---|
| 1 | Air France | 4 | 4–14 | 15+ |
| 2 | Delta Air Lines | 5 | 5–14 | 15+ |
| 3 | American Airlines | 5 | 5–14 | 15+ |
| 4 | United Airlines | 5 | 5–14 | 15+ |
| 5 | Southwest Airlines | 5 | 5–11 | 12+ |
| 6 | Aeromexico | 5 | 5–14 | 15+ |
| 7 | Lufthansa | 5 | 5–11 | 12+ |
| 8 | KLM Royal Dutch Airlines | 5 | 5–14 | 15+ |
| 9 | Turkish Airlines | 7 | 7–12 | 13+ |
| 10 | Virgin Atlantic | 14 | 14–0 | 14+ |
Frequently Asked Questions
Which airline has the cheapest unaccompanied minor fee?
Air France offers the lowest UM fees starting at €30 ($50) each way. Among US carriers, Southwest charges $100 each way. Delta and United both charge $150 each way.
Do all airlines allow unaccompanied minors on connecting flights?
No. Some airlines restrict UMs to nonstop flights only, especially for younger children (ages 5–7). Delta, United, and American allow connections for children 8+, but budget carriers often restrict UMs to direct flights.
What’s the difference between UM service on domestic vs international flights?
International UM service typically has a higher minimum age (usually 8–12 vs 5 for domestic), costs more, and requires additional documentation including passport copies and immigration forms.
At what age can a child fly completely alone without UM service?
This varies by airline: Southwest allows solo travel from age 12, while most other US carriers (Delta, United, American) require UM service until age 15. Virgin Atlantic only accepts unaccompanied travelers from age 14.