Searching for a lounge at Iki Airport (IKI) turns up nothing, and that is the honest answer: this small island airport off Nagasaki Prefecture has no Priority Pass room, airline club, or day-pass lounge, and its size makes that unsurprising rather than an oversight. Iki serves short-hop regional flights rather than the kind of scheduled long-haul traffic that lounges are built around.
The island-hopping reality of flying to Iki shapes everything about the airport. Flights here run on small regional aircraft, typically connecting to Fukuoka and Nagasaki, short island-service routes rather than a hub network, and the terminal itself is sized to match: compact, functional, and built for quick turnarounds rather than a lounge-worthy dwell time between flights. Most travelers pass through in minutes, not the hour-plus wait that makes a lounge worthwhile in the first place. Iki itself is better known for squid fishing in the surrounding Genkai Sea and for day-trippers headed over from Fukuoka than for any airport amenity, which fits an airfield built around brief regional hops rather than a destination in its own right.
Fukuoka Airport is the realistic place to look for an actual lounge if your itinerary includes an Iki flight as one leg of a longer trip. As one of Kyushu's major airports, Fukuoka supports established airline lounges and broader card-network access in a way that a small island field like Iki simply is not built to match. Routing your lounge expectations to Fukuoka, rather than Iki itself, is the practical approach for this kind of island-hop itinerary.
If you are flying into Iki purely for the island itself, treat the airport as a short, functional gateway rather than a lounge destination, and plan any lounge time into the Fukuoka or Nagasaki leg of your journey instead, confirming current access directly with the airport or your airline before you travel.