Best Mattress Discount King Sales: Where to Find Top Deals in 2025
King-size mattresses are a significant investment, and finding the right one at a discounted price requires careful planning. Discount events occur throughout the year, with some of the best deals available during major shopping holidays like Presidents’ Day, Memorial Day, Labor Day, and Black Friday. Retailers also host clearance sales to make room for new inventory, providing additional opportunities for savings.
When shopping for a king mattress during a sale, it’s essential to research brands, compare prices, and read customer reviews.

Below is a detailed breakdown of the best times to buy, top retailers, and a comparison table to simplify your shopping experience.
Best Times to Buy a King Mattress
Timing is crucial when looking for a mattress discount king sale. Major holidays and seasonal changes often trigger significant price drops. Here are the top periods to watch for deals:
- Presidents’ Day (February): Many retailers offer mattress sales during this holiday, with discounts ranging from 20% to 50%.
- Memorial Day (May): A popular time for mattress promotions, with clearance sales on older models.
- Labor Day (September): Another excellent opportunity to save, with retailers competing to offer the best deals.
- Black Friday and Cyber Monday (November): Some of the year’s deepest discounts, often bundled with free accessories like pillows or sheets.
- New Year’s Sales (January): Retailers clear out inventory, making it a great time to find leftover holiday deals.
Top Retailers for King Mattress Discounts
Several reputable retailers consistently offer competitive prices during mattress sales. Here are some of the best places to shop:
- Mattress Firm: Known for frequent sales and a wide selection of brands.
- Amazon: Offers year-round discounts and Prime-exclusive deals.
- Wayfair: Specializes in online mattress sales with free shipping.
- Costco: Provides bulk discounts and exclusive member pricing.
- Sleep Number: High-end mattresses with occasional financing options.
Comparison Table: Top King Mattress Discounts in 2025
| Retailer | Discount Range | Sale Period | Additional Perks |
|---|---|---|---|
| Mattress Firm | 30%-50% | Presidents’ Day, Labor Day | Free delivery, mattress removal |
| Amazon | 20%-40% | Cyber Monday, Prime Day | Free returns, fast shipping |
| Wayfair | 25%-45% | Memorial Day, New Year’s | Free bedding bundles |
| Costco | 15%-35% | Black Friday, July 4th | Member-only discounts |
| Sleep Number | 10%-30% | Labor Day, Holiday Sales | Flexible financing |
Factors to Consider Before Buying
While discounts are appealing, it’s important to evaluate other factors to ensure you get the best value:
- Mattress Type: Choose between memory foam, hybrid, or innerspring based on comfort and support needs.
- Warranty and Return Policy: Check the warranty length and return options in case the mattress doesn’t meet expectations.
- Delivery and Setup: Some retailers offer free delivery and setup, while others charge extra.
- Customer Reviews: Read verified reviews to gauge satisfaction and potential issues.
By keeping these factors in mind, you can make a well-informed purchase during a mattress discount king sale. For more information, visit trusted sources like Mattress Firm , Amazon , or Wayfair .