I want to book flights to Dammam from Aberdeen but am travelling with twins (2 infants) with just 1 adult, how much will the infants cost? It is a standard policy for all airlines that one adult can take only one infant with him/her. If there are more than one infants travelling with you (1 adult), then airline shall charge a fare that of a child and a seat will be provided for the 2nd infant (who is booked as a child). Frequently Asked Question »