Contact the reservation desk for each airline and ask about reduced airfare for children over two. Some airlines offer a lower rate for children between the age of three and 18 traveling with parents.
Inquire about special reduced airfare rates for yourself and your children, with various airlines, if your family must travel by air because of a death in the family or other family emergency.
Call a travel agent and get quotes for airfare to your destination. Explain how many children are flying with you and ask for the lowest rates possible.
Check airfare rates and airfare/hotel combo rates at websites such as Orbitz, Hotwire and Hotel.com. When traveling with children, it is sometimes less expensive to purchase a package deal.