How to Travel with a Booster Seat | Flying And Driving Rules

Traveling with a booster seat requires knowing two separate rule sets: how to transport it by air, and when it can be used safely in a car at your destination.

The most common mistake parents make is assuming a booster seat can be used on the airplane itself. The FAA is clear: boosters and backless child restraint systems are not approved for in-flight use during taxi, takeoff, or landing. They can be checked, gate-checked, or carried aboard if they fit the airline’s size rules — but they stay in the bag or bin until you reach the car. For the road portion, the rule is simpler: a lap-and-shoulder belt, tight across the lap and crossing the shoulder, with the child properly positioned. The table below lays out the different ways to handle the trip.

Can You Use A Booster Seat On A Plane?

No. The FAA does not allow belt-positioning booster seats or backless child restraint systems to be used on board an aircraft at any point during ground movement, takeoff, or landing. These seats are designed for vehicle seats with a lap-and-shoulder belt, not for aircraft seats. For children under 2, the FAA strongly recommends using an approved child restraint system (CRS) in the child’s own seat rather than traveling with a lap child. For older children who have outgrown a CRS, a booster cannot legally substitute on the plane.

What you can do is bring the booster as baggage. Pack it in a protective travel bag, label it with your contact info, and either check it at the counter, gate-check it at the departure gate, or carry it aboard if it fits the airline’s carry-on or personal-item size limits. If carried aboard, it counts against your allowance. When you gate-check, confirm where the seat will be returned at your destination — usually at the aircraft door upon landing.

Using The Booster Seat In A Car At Your Destination

Once you land, the booster is for the rental car, taxi, rideshare, or friend’s vehicle — but only if that vehicle has a proper lap-and-shoulder belt in the seat where the child will sit. The shoulder belt must cross the child’s shoulder and chest, not the neck or face. The lap belt must sit low and tight across the upper thighs, not the belly. Many vehicles lack a shoulder belt in the rear middle seat, so always check before buckling.

Before the trip, practice operating the booster’s shoulder-belt guide. Verify the headrest positioning in the destination vehicle — it should at least clear the child’s ears — and adjust it after the child is buckled. National safety guidance says children should ride in a booster until the vehicle’s seat belt fits properly on its own, which is typically around 4 feet 9 inches tall and often between ages 8 and 12. Children under 13 should remain in the back seat. For rideshares and taxis, the same lap-and-shoulder-belt rule applies; if the vehicle lacks it, the booster cannot be used in that seat.

Packing And Transporting The Booster For Air Travel

Before you book, measure the booster and check the airline’s carry-on and checked-baggage size and weight limits, which vary by carrier. A booster that fits the overhead bin or personal-item space can travel in the cabin; otherwise, check it. A padded travel bag reduces damage and makes the seat much easier to carry through terminals and in and out of rental cars. Label the bag clearly with your phone number — boosters left behind in overhead bins, shuttle vans, or baggage claim can ruin a trip.

For family boarding policies, check with the airline ahead of time. Some allow parents of young children to board early to get settled, which also gives you time to stow the booster in the overhead bin before the seat fill up.