Japan Fares are discounted fares available to all foreign travelers who fly to Japan. They can purchase domestic flights for only 10,800 yen (including consumption tax) per section.
For example, after spending time sightseeing in Tokyo, you can fly to Hakodate for only 10,800 yen. It’s a 1 hour 20-minute flight from Haneda Airport.
Check the airlines websites for conditions, restrictions, purchasing and others.