関連ワード:  is it expensive to fly to japan    is it expensive to fly to japan in december    is it expensive to fly to japan in april    is it expensive to fly to japan in november    is it expensive to fly to japan in march    is it expensive to fly to japan in october    is it expensive to fly to japan in june    is it expensive to fly to japan in may    is it expensive to fly to japan in august    is it expensive to travel to japan