Pulmicort Flexhaler Coupons and Discounts. Pulmicort Flexhaler is a prescription asthma inhaler maintenance treatment for adults and children 6 years of age or older. The average price for Pulmicort Flexhaler 180mcg is around $250. If you are prescribed this asthma medication but cannot afford a high insurance copay or are uninsured, a coupon for Pulmicort Flexhaler that can save you up to 75% is available on our site.