Most brides aim to spend about 8-10% of their total wedding budget on flowersThe average cost of wedding flowers in 2011 was in the ballpark of $2,000The average range of wedding flower costs is anywhere from $150 to upwards of $8,000.ere is a list of typical flower budget line items and their average costs: 1  Bridal Bouquet: $75-$250. 2  Bridesmaid Bouquets: $30-$75 each. 3  Boutonnieres: $10-$20 each. 4  Corsages: $15-$40 each. 5  Ceremony Decor: $375-$950.