Pay attention that the domestic terminal opens until 5:30am, and the subway starts from 5:30am (the same time). There’s no need to take a taxi to hurry, the counters are late too (JAL starts from 6:00
The price of most souvenir items are almost the same throughout japan. Except that it's tax free at the international airport. But there's not much to buy in this airport.
福岡空港の国内線ターミナル。2019年現在、大規模改築工事中。福岡市営地下鉄空港線の福岡空港駅に直結しており、アクセスは大変便利です。Domestic Terminal of Fukuoka Airport. Now under rebuilding work. Directory access to Subway Fukuoka Airport Station.