FREE
DealFree standard shipping on orders over $50
Standard shipping is free when the order total is over $50.
Min. spend $50Shipping
Verified· 6d ago
K18 Hair promo codes for October 2026
We confirm every code and deal on this page on K18 Hair's own pages and in posts about it, and each says when. 6 of 6 still work — the rest are listed below with the date they stopped.
Last checked 1 day ago
1 working code
Best today: 15% off
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Working K18 Hair codes today
- 15%Deal
Save up to 15% on K18 subscriptions
Choose K18 products and how often to replenish; subscriptions also include a free deluxe trial-size oil on the third order.
SubscriptionsVerified· 6d agoSee terms & exclusions
Subscriptions renew automatically until canceled. You may cancel anytime; Afterpay is not available for subscription orders.
- DEALDeal
Save around 30% with HSA/FSA payments
Use an HSA or FSA card through Flex at checkout for eligible items; savings come from paying with pre-tax funds.
PaymentsVerified· 6d agoSee terms & exclusions
Flex is available for eligible customers; HSA/FSA savings vary based on individual circumstances and eligibility.
- DEALDeal
Earn K18 coins toward cart discounts
Earn coins through challenges, reviews, and referrals. Maximum discounts are $25 for tier 1, $41 for tier 2, and $57 for tier 3.
RewardsVerified· 6d agoSee terms & exclusions
At least $67 must be in the cart to apply coins, and at least $11 must remain after coin discounts.
- 10%Deal
10% off your first K18 order
The store advertises this discount for a first order after subscribing to its email list.
First orderVerified· 6d ago - 10%Code
10% off storewide
SitewideVerified· 1d agoBR•••KE
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K18 Hair prices worth acting on
Prices read 21 Oct 2026 from K18 Hair's deals page
Hair masks
K18 Molecular Repair Hair Mask
$75
A bestselling leave-in mask that repairs hair damage quickly.
See it on K18 Hair
Dry shampoo
K18 AirWash
$48
A bestselling dry shampoo that refreshes hair and scalp after workouts.
See it on K18 Hair
Hair serums
K18 FutureIQ
$120
A new serum aimed at reducing shedding, graying and scalp aging.
See it on K18 Hair
Toning shampoo
K18 TripleBright
$39
Highly rated shampoo that keeps blonde hair brighter for longer.
See it on K18 HairWhen K18 Hair actually discounts
Our estimate of when K18 Hair's biggest discounts of the year happen, month by month. November is the month to wait for.
68%of K18 Hair's biggest discounts happen in November
Share of biggest discounts by month (%)
How to apply a code at K18 Hair
- 1
Copy the code above
Start with the one verified most recently, not the biggest number.
- 2
Go to the checkout page
Open the cart page and select the option to proceed to checkout. The promo code field is on the checkout page, not in the cart.
- 3
Enter and apply your code
Type your code into the promo code field on the checkout page. Then select the apply button to apply it.
- 4
Check the total dropped
If K18 Hair shows "Enter a valid discount code or gift card", the code did not work — tell us, and a code shoppers report as failing moves to the bottom of the list.
Everything else worth knowing before you buy
- Best month to buy
- November — about 68% of K18 Hair's biggest discounts of the year fall in it, by our estimate.
- Payment
- K18 partners with Flex to allow checkout with HSA/FSA cards. Customers can also pay with a credit or debit card, and subscriptions are paid with a standard payment method at checkout.
- Customer service
- Customer service can be reached via email at [email protected] or by call/text at +1 844-564-0382. Business hours are Monday through Friday from 9am to 5pm PT.
- Newsletter
- K18 may provide discounts or promotions when you agree to receive marketing and promotional communications from them.
K18 Hair sale calendar
Our estimate of when K18 Hair's biggest discounts of the year happenIn 5 weeks
Black Friday Sale
The day-after-Thanksgiving kickoff sale, the biggest discount event of the year.
62% of its biggest discounts
In 6 weeks
Cyber Monday Sale
The online-focused sale on the Monday after Thanksgiving weekend.
5% of its biggest discounts
In 6 weeks
Holiday Sale
A December gift-season sale running through Christmas.
6% of its biggest discounts
In 2 months
New Year Sale
A January sale to start the new year.
1% of its biggest discounts
K18 Hair coupon questions
Six questions people actually ask us.
Does K18 Hair limit how many of one product I can order?
K18 reserves the right to limit the order quantity on any product and to refuse service to any customer.
What is the K18 Hair return policy?
K18's return and refund policy is published on its help centre and is incorporated into its Terms of Service in its entirety.
Does the K18 Hair warranty apply to purchases outside the United States?
The Limited Warranty applies only to products sold to direct consumers in the United States, unless otherwise prohibited by applicable law.
Can I use my HSA or FSA for a K18 Hair subscription?
Yes. Pay with a standard payment method, then select Flex from the Thank You page so the HSA/FSA details can be gathered.
Can I use an HSA or FSA card at K18 Hair?
Yes, through Flex. Select Pay another way or check out as a guest, choose the Flex HSA/FSA option, and enter your card details. If you don't see Flex, you may be in Shop Pay, so check out as a guest.
How do I contact K18 Hair about a product problem or warranty claim?
Call 844-564-0382 or write to Customer Service, K18, Inc., 621 Sansome Street, San Francisco, California 94111.
Keep looking
K18 Hair and the K18 Hair logo are trademarks of their owner, shown here solely to identify the store and its offers. Couponly is an independent service and is not affiliated with, endorsed by, or sponsored by K18 Hair. We may earn a commission when you shop through our links. See our Terms.