Formal Dresses Under $400 Australia – Designer Prom Gowns

Searching for formal dresses under $400 in Australia? One Honey Boutique brings together an extensive edit of prom dresses, school formal gowns and eveningwear currently priced below $400, making it easier to discover your perfect dress within budget.

Shop for Year 10 and Year 12 formal, prom, graduation, balls, weddings, galas and special occasions across fitted, A-line, mermaid, corset and statement gown silhouettes.

Within a $400 budget, discover even more of the One Honey designer range, including satin gowns, sparkling styles, structured bodices, lace details, embellishments and trend-led formalwear across an evolving selection of colours and sizes.

Shopping within a lower price range? Explore our formal dresses under $300 for styles within the previous budget tier.

Want to unlock an even wider designer selection? Continue to our formal dresses under $500 collection for more prom, school formal and evening gown options.

Looking specifically for discounted gowns? Browse our formal dress sale for reduced prom, school formal and evening dresses across multiple price points.

For our complete formalwear edit, explore formal dresses Australia, shop prom dresses or discover our evening dresses.

Prices, sizes and availability can change as products sell through, new gowns arrive or pricing changes. Always check the individual product page for the current price, size options and availability.

Shopping for your school formal? Australia's Largest Dress Register helps protect the exclusivity of eligible registered One Honey gowns for participating school formals and events.

Proudly Australian owned since 2011 with over 1,000+ 5-star reviews, One Honey Boutique is a trusted destination for designer prom, school formal and occasion wear.

Need help with sizing, ordering or planning around your event date? Visit our Help Centre for shopping support.

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Discover formal dresses under $400 at One Honey Boutique — designer prom, school formal and evening gowns for an unforgettable look within your budget.