The average cost of one was $175. Something as small as the petals for the flower girl could cost as much as $35. ... Average wedding flower costs. Common floral items for weddingsLow-pricedHigh-priced Bridal bouquet$60$965 Bridesmaids' bouquets (each)$60$65 Flower girl crowns$35$40 Groom's boutonniere$15$35 4 more rows Aug 11, 2021