Seat fees for a family of 6 can reach $600–$900 round trip. A combination of federal rule changes and smart booking order can often eliminate that cost entirely — but you need to know the rules and apply them in the right sequence.
The 2024 DOT Family Seating Rule
The Department of Transportation finalized guidance in 2024 directing U.S. airlines to seat children aged 13 and under adjacent to an accompanying adult passenger at no additional charge, provided adjacent seats are available on the aircraft. "Adjacent" means directly next to — not one row ahead, not across the aisle. Airlines that cannot guarantee adjacent seating without a fee must disclose this prominently at the time of booking. This applies to all U.S. domestic routes and international flights operated by U.S. carriers.
Booking Order Tactics
The rule only helps if adjacent free seats still exist when you book. Most airlines release a block of free seats at the back of the aircraft; premium and exit-row seats remain fee-based. Book as early as possible on a standard economy fare (not basic economy, which withholds seat assignment until check-in on most carriers). When six free seats in two rows of three do not exist side by side, book two rows of three — a 3-seat row directly behind another 3-seat row — which keeps all children within one row of a parent.
What to Do When the Airline Scatters You
If the system assigns scattered seats, do not pay. Instead: call the airline directly before check-in, cite the DOT family seating guidance, and ask a supervisor to manually reassign adjacent seats. Alternatively, at the gate, ask the gate agent to move your party before boarding begins — they have seat-map override authority that online check-in does not.
