If your child is under two on the outbound flight but turns two before the return, do not assume the original infant arrangement covers both flights. Korean Air’s traveling-with-children guide says a child who reaches 24 months during the trip must have a separate seat at the child fare. It directs this case to the Service Center because it cannot be booked through the website. Resolve the return leg before you rely on the displayed itinerary.
Check the age on every flight date
Write down the child’s date of birth and each flight’s local departure date. Compare the age on the first flight with the age on the later flight; the booking problem may appear only on the return. Then look at the issued passenger type and seat assignment for each leg, not merely the headline price or the adult’s confirmation number.
Tell Korean Air or the ticket issuer: “My child is under 24 months on the outbound flight and 24 months or older on the return. What passenger type, seat and ticket change are needed on each flight?” Give the reservation number and both flight dates. Ask for the amount and any issue or change conditions before authorizing payment. Afterward, reopen the itinerary and check that the child has a valid ticket and seat on the affected leg. A support request is not the same as a completed reissue.
If the booking was made through a travel agency or includes another operating airline, ask the issuer and operating carrier which party can correct the ticket. Do not wait until check-in to discover that the infant record and the return seat disagree.
One adult traveling with two infants is another seat check
Korean Air’s guide says that when one adult travels with two infants, one infant must hold a child-fare ticket and occupy a separate seat. Identify which child will have that seat when requesting the booking. Confirm the arrangement on every flight, especially if the children or operating airlines differ by leg. Do not count on two lap-infant entries appearing in a search result as proof that the party is ticketed correctly.
A bassinet request is a different decision. The airline describes advance bassinet requests for eligible infants and notes aircraft or seat-configuration limits. It does not replace a seat required by the child’s age or by the one-adult/two-infant arrangement. Ask about a bassinet only after the passenger types and required seats are clear, and verify the request result separately.
Last checked: September 29, 2026 KST. Confirm the issued ticket and seat with Korean Air and any other operating airline for the actual flight dates.