The number of things that can go sideways on a family trip is roughly equal to the number of people multiplied by the number of days. But most of them are preventable with the right preparation, and once you understand how airlines actually treat kids on flights, the whole thing gets simpler.
Age-specific rules
| Age band | Rules |
|---|---|
| Under 2 (lap infant) | Free on many airlines domestically; 10% of fare internationally. Requires own passport if international. |
| 2-4 (own seat) | Full fare in most cases, own seat required. Car seat allowed at no extra charge in the cabin. |
| 5-11 | Full fare, often discounted family fare available; may travel alone as an unaccompanied minor. |
| 12-14 | Adult fare; can travel alone but airlines vary on whether UM service is required. |
| 15-17 | Adult fare; UM service usually optional. |
Booking a family trip
- Book directly with the airline, not through an OTA. Family seat assignments are harder to coordinate through third parties.
- Select seats at booking. Airlines increasingly separate families on Basic Economy - you may end up seated apart.
- Consider daytime flights over redeyes. The savings are rarely worth a jet-lagged 5-year-old.
- For international trips, buy seats for children over 2 even if some carriers allow up to older ages on discounted fares.
- Add each child's passport info at booking, especially for international.
At the airport
Family lanes exist at TSA and at many international checkpoints. Look for the sign specifically - the family lane usually allows keeping shoes on for children under 12 and permits fluids for babies without the 100 ml limit.
At boarding, families with children under 2 (some carriers under 4) get pre-boarding. Take advantage - it lets you set up before the aisle fills.
Onboard survival
- Feed the baby or offer a bottle/pacifier during takeoff and descent. The swallowing equalises ear pressure.
- Change diapers before boarding whenever possible. Aircraft changing tables are cramped.
- Bring twice the snacks you think you need. Delayed meals ruin everything.
- Have a favourite toy in the personal item that is only used on the flight - new toys hold attention longer.
- Download shows and games offline before departure. Onboard wifi is unreliable.
- Bring a change of clothes for the child in the carry-on, and for you (in case of a spill).
Documents and consent letters
For international travel with a child:
- Every child has their own passport, no matter how young.
- Birth certificate is helpful, sometimes required (South Africa requires the unabridged version).
- If traveling with only one parent, most countries recommend a notarised consent letter from the non-traveling parent. Some (South Africa, Mexico crossing, Middle East) require it.
- For divorced/separated parents, bring the custody documentation.
- For a child traveling without either parent (grandparent, adult sibling, family friend), notarised consent from both parents is essential.
See also: family trip checklist, travel documents checklist, first-time flyers guide.
Frequently asked
Are strollers charged as baggage?+
No on nearly all carriers. Strollers and car seats are gate-checked free of charge and don't count against baggage allowance.
Is there an onboard bassinet?+
On many long-haul aircraft yes, but limited. Request at booking; usually free but not confirmed until check-in.
Does my toddler need to wear a mask?+
As of early 2026, no airline mandates masks. Individual airports may still have their own signage.
Priya Menon
Travel documentation writer at AirHelpService
Writes about air travel operations, passenger rights and airport procedures. Reader questions and corrections welcome via our contact page.
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