Best Mattress Online offer
10% off
Extra 10% Off For NHS Staff At Mattress Online
A Mattress Online voucher code lands on top of prices that are already keen, so run through the codes below first. Free next-day delivery reaches most of mainland Britain, every mattress carries the 100-night comfort trial, Klarna splits the bill at 0% if you want to pay in stages, and NHS staff and Blue Light Card holders have a discount route of their own. One thing to watch: a single excluded item in the basket will bounce the whole code, so check that before you reach the payment page.
Codes come from the retailers’ affiliate networks and our sync checks them regularly; the date on each card is when that code was last checked.
All Mattress Online deals
Standing offers at Mattress Online
- Free next day delivery to most of the UKGet deal
- 100-night comfort trial (mattress protector required)Get deal
- 0% finance available with Klarna (subject to eligibility)Get deal
- Minimum 12-month guarantee on all itemsGet deal
Spin the wheel for your Mattress Online discount
Give the wheel a spin to reveal one of today's Mattress Online deals. Spin as many times as you like!
How to use a Mattress Online deal
Pick a deal
Start with the best offer at the top of this page, or spin the wheel.
Go to Mattress Online
"Get deal" opens the Mattress Online website. No code is needed.
Check the basket
Before you pay, check the offer shows in the basket total.
Is there a Mattress Online sale on right now?
Yes. We list 3 Mattress Online offers you can use today, with savings of up to 10% off, last checked today. Codes that stop working are moved to the expired list.
Ways to save at Mattress Online
- NHS or Blue Light Card? Start there. Mattress Online runs its own discount for NHS staff and Blue Light Card holders. NHS staff verify with a work email address, card holders come through the link inside their Blue Light account, and it will not sit alongside another voucher, so work out which single saving is worth more before you commit.
- Put the protector in the same order. The 100-night comfort trial only stands if you bought a Mattress Online protector at the same time and slept on it from the first night. Buy it with the mattress and the trial is yours; buy it a fortnight later and it is not.
- Spend it on Millbrook or the house labels. Luna and Bodyshape are Mattress Online's own brands and the spec inside them is good for the money. Millbrook is my middle ground: heritage build, sensible price. Either is a sound place to put a code.
- Total it both ways in a sale. There is a site-wide sale against RRP running most of the time here, so there is usually a reduction before any code goes near your basket. Price it with the sale alone and then with the code added, and pay the lower figure.
- Book the old-mattress collection with the order. Mattress Online will take one old mattress away, same size or smaller, but only on delivery day and only if you add the service when you order. It will not take a bed frame, and nothing can be arranged once the van has gone.
- Buy the pillows at the same time. Adding pillows or a protector lifts the basket over a code's minimum spend, and it saves a second delivery slot later.
About Mattress Online
Mattress Online is an independent online mattress retailer from Rotherham, online since 2003, stocking a wide range from brands like Silentnight, Sealy, and Sleepeezee.
It now writes its name as MattressOnline and runs four Yorkshire stores alongside the website. The National Bed Federation named it Online Bed Retailer of the Year for 2026.
What we like
- Free next-day delivery across most of mainland Britain
- NBF Online Bed Retailer of the Year 2026
- 100-night comfort trial on standalone mattresses
- Four Yorkshire stores, and any bed can be sent to one
Delivery, returns and codes at Mattress Online
Delivery
Free Next-Day Delivery from MattressOnline
Order early enough in the day and most of mainland Britain has the mattress the next weekday, at no charge.
- Free next-day delivery on most products, to most of mainland Britain
- Cut-off is 4pm on a weekday, or 2pm on Saturday for a Sunday or Monday arrival
- Standard delivery reaches the main entrance of the building; Room of Your Choice is a paid upgrade
- A delivery date can be booked up to 60 days ahead
- Northern Ireland and some Scottish and Welsh postcodes have set days or a surcharge, and MattressOnline says it takes no profit on that surcharge
- One old mattress, the same size or smaller, taken away on delivery day for a charge; old bed frames are not collected
Returns
The MattressOnline 100-Night Comfort Trial
Every standalone mattress carries the comfort trial, and it works as an exchange rather than a refund.
- 100 nights to decide, with at least 30 of them slept on before a swap
- A MattressOnline protector, bought with the bed and used from night one, is what qualifies you
- One exchange per mattress, same size, a flat fee, and any price difference to settle
- Swap down to a cheaper mattress and you get site credit for the gap, never a refund
- Folding-bed and sofa-bed mattresses sit outside the trial, as do mattresses taken out of the UK
- Still sealed and unused? Say so in writing inside 14 days, then send it back within another 14
- Exchanged mattresses never go back on sale on the website
Using codes
Where the Mattress Online voucher box sits
Mattress Online keeps its voucher field in the basket, before you reach payment, and the total redraws the moment the code lands. Codes arrive as a percentage, as cash off the basket, or as a free accessory with the order, and each one carries an end date, so read that before you spend an afternoon choosing a bed.
- Percentage codes
- Flat amount off the basket
- Free accessory with an order
- The NHS and Blue Light Card route
Does a Mattress Online code beat the sale price?
It usually adds to it, which is the best answer you can get on a voucher page. Prices here start keen, next-day delivery costs nothing to most of the mainland, and the National Bed Federation named Mattress Online its Online Bed Retailer of the Year for 2026, so the deal is strong before a code touches it. The code goes furthest on a mid-priced pocket-sprung bed, with a Mattress Online protector alongside it so the comfort trial holds. If the NHS or Blue Light discount is open to you, take that one instead, because the two do not run together.
Four beds worth putting it on
- Hypnos Marlow Ortho Deluxe: natural fillings, a proper Hypnos build, and you can turn it, which is rarer than it should be. Ignore the word Ortho. It is firm, so it suits back and front sleepers.
- Millbrook Wool Luxury 1000 Pocket: wool over pocket springs from a maker I keep coming back to. A few owners find it a touch firmer than a standard medium. A few more mention turning it over regularly.
- Relyon Rufford Memory 1500 Pocket: memory foam over Relyon pocket springs, for anyone who wants a softer surface without losing the support underneath. A few owners call it nicely firm, and one liked it enough to buy it a second time.
- Luna Memory 1000 Pocket Hybrid: the house budget label, and a good spec for the price. It is memory foam on top, so expect it to sleep warmer than the wool beds above. Several owners single out the value for money.
Corrections
When we get something wrong, we fix it and say so here. All corrections
- 9 October 2026
- We said Mattress Online offers a free 60-night trial with returns. It's a 100-night trial, exchange only, £49 fee, and you must buy their mattress protector.
- 9 October 2026
- We said Mattress Online's comfort trial was 60 nights on selected brands. It's 100 nights on all mattresses, exchange only, with a £49 fee.
Mattress Online discount code questions
In the basket on mattressonline.co.uk, before the payment step. Drop the code into the voucher field, press Apply, and the order total redraws. If nothing happens, check the code for a minimum spend or a brand it leaves out.
Yes, to most of mainland Britain, provided you order before the cut-off shown on the product page. Standard delivery goes to the main entrance of the building, and room of your choice is a paid upgrade. Northern Ireland and some Scottish and Welsh postcodes have set delivery days or a surcharge.
Yes. Mattress Online runs an ongoing NHS discount, and NHS staff verify with a valid NHS email address. It cannot be used with another voucher code, so set it beside the codes above and claim whichever is worth more.
A 100-night comfort trial on every standalone mattress, as long as you bought a Mattress Online protector at the same time and used it from night one. Sleep on the bed for at least 30 nights, then get in touch before the trial runs out and swap it for another mattress. It is an exchange with a flat fee, not a refund, and if the replacement is cheaper the difference comes back as site credit rather than cash.
Yes. There are four Yorkshire stores, and any product from the website can be sent to one of them to try at no extra cost.
Yes. Sign in to your Blue Light Card account, follow the Mattress Online link from there, and the discount code is added for you at the checkout. The code only appears if you arrive through that link.
Work on one code per order. The NHS discount will not run with another voucher, and a basket holding an excluded item rejects a code outright, so add it last and keep an eye on the total.
Nearly always. A site-wide banner runs against RRP and the listings show reduced prices with it, so you are often starting from a reduced price before any code lands. Check the total with and without the code and keep the better one.
Yes. Pay in 3 splits the bill into three interest-free instalments, and the 0% Finance plan runs over six, ten or twelve months. Both involve a credit check.
For a charge, and only on delivery day. The service covers one mattress the same size or smaller than the one arriving, it has to be booked with the order, and old bed frames are not taken.
Similar stores with discount codes
