| Airline | Age | Fee per child (each way) | Notes |
| Air Canada | Eight to 11 years old – must purchase UM service 12-17 years old – UM service optional | $100 CAD/USD | The Unaccompanied Minor (UM) service is available for non-stop flights only. |
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| AirTran Airways | Five to seven years old – nonstop or direct flights only Eight to 11 years old – may travel unaccompanied, even on connecting flights | $49 for nonstop $98 for connecting | Unaccompanied children cannot fly on the last flight of the day. |
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| American Airlines | Five to seven years old – nonstop or direct flights only Eight to 14 years old – unless travelling with another passenger at least 15 years old, the unaccompanied minors service must be used | $100 (only one fee applies for two+ siblings flying same itinerary) | Flights for unaccompanied minors cannot be booked online. |
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| British Airways | Five years old – single sector, direct, nonstop flights only Six to 14 years old – can travel alone on connecting flights as long as layover is less than six hours | $50 for flights within UK $75 for long-haul | Flights for unaccompanied minors cannot be booked online, and children must be registered with the Skyflyer Solo service 48 hours before departure. |
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| Delta Air Lines | Five to seven years old – nonstop or direct flights only Eight to 14 years old – nonstop and connecting flights | $100 | Unaccompanied minors are not permitted on Red Eye flights (between 9 pm and 5 am), with the exception of flights departing from Alaska or Hawaii and connections to / from international flights. |
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| Frontier Airlines | Five to 14 years old – nonstop or direct flights only connecting flights permitted | $50 per non-stop or direct flights $100 for connecting flights | Unaccompanied minors pay a full adult fare. |
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| Porter Airlines | Five to 11 years old | $100 CAD/USD | Book via the Porter Call Centre (1-888-619-8622). Parents must wait at the airport until the flight has been airborne for 20 minutes. |
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| United Airlines | Five to 7 years old – nonstop flights only Eight to 11 years old – all United flights permitted, but not the last connecting flight of the day | $99 (only one fee applies for up to three siblings flying same itinerary) | |
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| US Airways | Five to 14 years old – nonstop only 15 to 17 years old – nonstop flights only when assistance is required, otherwise connecting flights are permitted if no assistance is needed | $100 | Five to 14 years old – first and second checked bag fees waived when “unaccompanied minors” service is purchased |
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| WestJet | Twelve years and older | No fee | Children 11 and younger cannot travel unaccompanied. The airline is set to release new guidelines in May 2012. |