Winix Replacement Filter S 2‑Pack Just $59.99 at Costco

Updated August 28, 2026

If you own a Winix C545 air purifier, the Winix Genuine Replacement Filter S 2‑Pack is now $59.99 at Costco. This price gives you a fresh supply of filters without paying the typical retail markup.

Why this air purifier filter deal stands out

• Designed specifically for the Winix C545 model, ensuring a perfect fit.
• Each filter captures particles as small as 0.3 µm, improving indoor air quality.
• Buying a 2‑pack reduces the need for frequent re‑orders.
• Costco’s price is lower than most online retailers, which often list the pack at $80 or more.

How to grab the deal at Costco

1. Select the “Winix Genuine Replacement Filter S, 2‑pack for C545 Air Purifier” product.
2. Click the SHOP HERE button above to add the item to your cart.
3. Proceed to checkout and complete your purchase.

Savings tips & price context

If you already have a Costco membership, there’s no extra cost to claim this deal.

FAQ

Do I need a Costco membership to buy this filter?

Yes, Costco requires a membership for online purchases. If you’re not a member, you can still shop in‑store, but the online price may not be available.

How often should I replace the Winix filter?

Winix recommends changing the filter every 6‑12 months, depending on usage and air quality. The 2‑pack gives you coverage for up to a year.

Is this filter compatible with other Winix models?

The S‑type filter is specific to the C545 series. Other Winix models use different filter sizes, so be sure to verify compatibility before purchasing. Ready to keep your indoor air clean without breaking the bank? Grab the Winix replacement filter Costco deal today and enjoy fresher air at home. For more household savings, check out our household essentials page.

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