Function 18 Promo Codes & Coupons February 2026

Your Function 18 discount code might not work due to expiration, UK-only shipping restrictions, or exclusion from sale items—common error messages include "Invalid code" or "Code not applicable to this order."

Function 18 codes like 2375TEE (10% off sitewide) often fail if your cart has clearance items already discounted up to 50%, or if shipping isn't to the UK. Users report codes auto-applying on select items but erroring on full carts with loyalty points redemptions.

1. Log in at function18.com/checkout
2. Clear cart of sale items
3. Enter code in the "Promo Code" field below subtotal
4. Hit "Apply"
5. Switch to UK delivery if needed

Codes are single-use per customer and can't stack with newsletter 20% offers; many last 1-3 months.

Pro tip: Test codes on small carts first—users save most by signing up for the 20% email code before big sales.

No, Function 18 allows only one promo code per order, as stated in terms for codes like LEO10 or 75TEE, which explicitly note "not combinable with other discounts."

This policy prevents stacking, with checkout errors like "Only one code allowed" common when trying newsletter 20% + sitewide 10%. Loyalty points (e.g., £5 off for 250 points) also can't combine and expire in 10 months.

1. Pick the highest value code (e.g., 20% newsletter over 10% sitewide)
2. Apply at checkout's promo field
3. Use points on a separate order

Restrictions: One-time use per customer; valid on UK orders only until codes expire.

Pro tip: Earn 1 point per £1 spent and redeem on future orders—shoppers double savings this way without code conflicts.

Function 18 promo codes are typically not valid on sale or clearance items, which are already discounted up to 50-70%, triggering errors like "Code not applicable to sale items."

User experiences show codes like "Extra 10% Off Sale Items" rarely work on clearance, as terms specify "cannot be used in conjunction with any other offer." Up to 55% off sale deals stand alone.

1. Add non-sale items to cart
2. Apply code at checkout
3. If it fails on mixed carts, remove sale pieces

Limitations: One per person, subject to availability; unverified codes sometimes auto-apply to discounted items but get rejected.

Pro tip: Browse "Sale" separately for up to 50% off without codes—combine with free UK shipping for max value.

Function 18 doesn't offer a standard student discount with a verification code; instead, general promo codes apply sitewide, entered in the checkout "Promo Code" field—no separate student portal noted in current offers.

Users seeking student deals often confuse it with newsletter sign-ups (20% code emailed); no UNiDAYS/Student Beans integration reported, leading to "Code invalid" errors.

1. Verify eligibility via email signup at function18.com
2. Receive code
3. Paste into checkout promo box below basket summary before payment

Restrictions: UK-only, single-use; no explicit student program, but sitewide 10% codes like NIKE10 work for all.

Pro tip: Sign up for emails first—gets you 20% off instantly, better than unverified student hunts.

Function 18 promo codes generally do not work on limited edition or designer collections like select Nike items, as they're often excluded like sale stock, showing "Not applicable" errors.

Codes such as NIKE10 or NIKE20 are footwear-specific but skip limited drops; user reports confirm sitewide 10% fails on designer collabs due to "exclusions apply."

1. Add designer item to cart alone
2. Enter code (e.g., 2375TEE) at checkout
3. If rejected, try unverified "Up to 20% Off Select Items"

Limitations: UK shipping only, one code per order; patterns show exclusions during high-demand releases.

Pro tip: Watch for brand-specific codes like NIKE20 on promo trackers—apply early as they're used thousands of times and expire fast.

Function 18 occasionally issues discount codes to shoppers. In the past month, they have launched 1 new promo coupon. While the availability of these codes may vary, customers should regularly check Function 18 website or sign up for their email newsletter to stay informed about new discounts.

On average, Function 18 provides 1.5 discount coupons each month. Based on historical data, the average time between Function 18 coupon releases is approximately 20 days. However, this is subject to change and may depend on various factors such as seasonal promotions, product launches, or other marketing initiatives. To stay informed about upcoming discounts and promotions, we recommend checking Function 18 website regularly, subscribing to their email newsletter, and following them on social media.

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On average, Function 18 offers 1.5 coupon codes per month. As of today, Function 18 has 1 active coupons and offers.

As of Feb 14, 2026, it does not appear that Function 18 has discounts for Black Friday or Cyber Monday. We regularly check for Function 18's Black Friday and Cyber Monday discounts, so be sure to check back on this page to find the latest cyber week deals.