King Size Mattresses - Low Prices on Top Brands - MattressOnline

Excellent

72,291reviews on

The Sleep Journal

Menu

Trade Stores Wishlist

About Us Delivery Help Centre Our Experts Advice The Sleep Journal Contact Us

View all Mattresses

Need some help?

What Mattress Firmness Is Right for Me?The Best Mattress for Each Sleeping Position

Superking Mattresses6' x 6'6" / 180cm x 200cm King Size Mattresses5' x 6'6" / 150cm x 200cm Double Mattresses4'6" x 6'3" / 135cm x 190cm Small Double Mattresses4' x 6'3" / 120cm x 190cm Single Mattresses3' x 6'3" / 90cm x 190cm Small Single Mattresses2'6" x 6'3" / 75cm x 190cm European Size Mattresses All Mattresses

Pocket Sprung MattressesIndividual, responsive springs Standard Sprung MattressesOpen coil and Miracoil springs Memory Foam MattressesMoulds to your body shape Hybrid MattressesSprung support with foam comfort Latex MattressesNatural support & pressure relief Gel MattressesDesigned for a cooler sleep Natural & Organic MattressesBreathable and premium comfort Orthopaedic Mattresses Hypoallergenic & Anti-Allergy Mattresses Eco Mattresses Kids Mattresses Pillow Top Mattresses Zip & Link Superking Mattresses Rolled Mattresses Next Day Delivery Mattresses All Mattresses

Extra Firm Mattresses Firm Mattresses Medium Firm Mattresses Medium Mattresses Soft to Medium Mattresses All Mattresses

Need some help?

Bed & Mattress Size Guide Bed Buying Guide

Superking Beds6' x 6'6" / 180cm x 200cm King Size Beds5' x 6'6" / 150cm x 200cm Double Beds4'6" x 6'3" / 135cm x 190cm Small Double Beds4' x 6'3" / 120cm x 190cm Single Beds3' x 6'3" / 90cm x 190cm All Beds

Bed Frames Divan Beds Storage Beds Ottoman Beds Sofa Beds TV Beds Kids Beds Next Day Delivery Beds Guest Beds Headboards All Beds

Silentnight Elle Decoration Novo Jay-Be Birlea Vogue LPD Flintshire Furniture Friendship Mill All Beds

Wooden Bed Frames Upholstered Bed Frames Metal Bed Frames All Beds

View all Bedding

Need some help?

Pillow Buying Guide Duvet Buying Guide All About Mattress Toppers

Memory Foam Pillows Latex Pillows Natural Pillows Hollowfibre Pillows Gel Pillows Cooling Pillows Hypoallergenic & Anti-Allergy Pillows View all Pillows

4.5 Tog Duvets 7.5 Tog Duvets 10.5 Tog Duvets 13.5 Tog Duvets 15 Tog Duvets View all Duvets

Waterproof Mattress ProtectorsProtection against spills and accidents Hypoallergenic & Anti-Allergy Mattress ProtectorsProtects against allergens and dust mites Quilted Mattress ProtectorsA stylish and comforting finish Cooling Mattress ProtectorsProtection and cooling in one View all Mattress Protectors

Memory Foam Mattress ToppersComfort tailored to your body shape Gel Mattress ToppersExtra pressure relief and cooling comfort Natural Mattress ToppersNaturally breathable with plush fillings Hypoallergenic Mattress ToppersExtra comfort and allergy protection View all Mattress Toppers

Weighted BlanketsSoothing weight to promote relaxation Electric BlanketsKeep warm and cosy in the colder months View all Blankets

Save up to 55% off RRP*

Discounted end-of-range-products

View all Brands

Need some help?

What Mattress Firmness is Right for Me?Bed Buying Guide Pillow Buying Guide

Silentnight Sleepeezee Sealy Hypnos Harrison Spinks Millbrook Beds Emma TEMPUR Simba Relyon SleepSoul Wentworth Mercer Rest Assured Luna Panda Novo All Brands

Superking Mattresses6' x 6'6" / 180cm x 200cm King Size Mattresses5' x 6'6" / 150cm x 200cm Double Mattresses4'6" x 6'3" / 135cm x 190cm Small Double Mattresses4' x 6'3" / 120cm x 190cm Single Mattresses3' x 6'3" / 90cm x 190cm Small Single Mattresses2'6" x 6'3" / 75cm x 190cm European Size Mattresses

Pocket Sprung MattressesIndividual, responsive springs Standard Sprung MattressesOpen coil and Miracoil springs Memory Foam MattressesMoulds to your body shape Hybrid MattressesSprung support with foam comfort Latex MattressesNatural support & pressure relief Gel MattressesDesigned for a cooler sleep Natural & Organic MattressesBreathable and premium comfort

Orthopaedic Mattresses Hypoallergenic & Anti-Allergy Mattresses Eco Mattresses Kids Mattresses Pillow Top Mattresses Zip & Link Superking Mattresses Rolled Mattresses Next Day Delivery Mattresses

Shop by Firmness

Extra Firm Mattresses Firm Mattresses Medium Firm Mattresses Medium Mattresses Soft to Medium Mattresses

Need help?|What Mattress Firmness Is Right for Me?The Best Mattress for Each Sleeping Position

Superking Beds6' x 6'6" / 180cm x 200cm King Size Beds5' x 6'6" / 150cm x 200cm Double Beds4'6" x 6'3" / 135cm x 190cm Small Double Beds4' x 6'3" / 120cm x 190cm Single Beds3' x 6'3" / 90cm x 190cm

Bed Frames Divan Beds Storage Beds Ottoman Beds Sofa Beds TV Beds Kids Beds Next Day Delivery Beds Guest Beds Headboards

Silentnight Elle Decoration Novo Jay-Be Birlea Vogue LPD Flintshire Furniture Friendship Mill

Shop by Material

Wooden Bed Frames Upholstered Bed Frames Metal Bed Frames

Need help?|Bed & Mattress Size Guide Bed Buying Guide

Memory Foam Pillows Latex Pillows Natural Pillows Hollowfibre Pillows Gel Pillows Cooling Pillows Hypoallergenic & Anti-Allergy Pillows

4.5 Tog Duvets 7.5 Tog Duvets 10.5 Tog Duvets 13.5 Tog Duvets 15 Tog Duvets

Mattress Protectors

Waterproof Mattress ProtectorsProtection against spills and accidents Hypoallergenic & Anti-Allergy Mattress ProtectorsProtects against allergens and dust mites Quilted Mattress ProtectorsA stylish and comforting finish Cooling Mattress ProtectorsProtection and cooling in one

Mattress Toppers

Memory Foam Mattress ToppersComfort tailored to your body shape Gel Mattress ToppersExtra pressure relief and cooling comfort Natural Mattress ToppersNaturally breathable with plush fillings Hypoallergenic Mattress ToppersExtra comfort and allergy protection

Weighted BlanketsSoothing weight to promote relaxation Electric BlanketsKeep warm and cosy in the colder months

Need help?|Pillow Buying Guide Duvet Buying Guide All About Mattress Toppers

Save up to 55% off RRP*

Discounted end-of-range-products

Need help?|What Mattress Firmness is Right for Me?Bed Buying Guide Pillow Buying Guide

Your Basket

Your basket is empty :(

Why not browse our product ranges?

Mattresses Beds Pillows Duvets Mattress Protectors Mattress Toppers

Free delivery to most locations

100-night mattress trial

Old mattress removal service

Save up to 55% off RRP*

Home
Mattresses
King Size Mattresses

97-120 of 231 products

Relevance
Biggest Saving
Highest Price
Lowest Price

97-120 of 231 products

Filters

1

King Size

Size (1)King Size

Superking

(232)

6' x 6'6" | 180cm x 200cm

King Size

(231)

5' x 6'6" | 150cm x 200cm

Double

(239)

4'6" x 6'3" | 135cm x 190cm

Small Double

(174)

4' x 6'3" | 120cm x 190cm

Single

(257)

3' x 6'3" | 90cm x 190cm

Small Single

(16)

2'6" x 6'3" | 75cm x 190cm

Emperor

(24)

6'6" x 6'6" | 200cm x 200cm

Superking Zip and Link

(21)

6' x 6'6" | 180cm x 200cm

European King Size

(19)

5'3" x 6'6" | 160cm x 200cm

European Double

(15)

4'7" x 6'6" | 140cm x 200cm

Adjustable Single

(3)

3' x 6'6" | 90cm x 200cm

Adjustable Small Single

(2)

2'6" x 6'6" | 75cm x 200cm

Single Short

(1)

3' x 5'9" | 90cm x 175cm

Small Single Short

(1)

2'6" x 5'9" | 75cm x 175cm

Cot Bed

(1)

2'4" x 4'7" | 70cm x 140cm

Continental Cot

(2)

2' x 4' | 60cm x 120cm

3-Seater Sofa Bed Mattress

(1)

2-Seater Sofa Bed Mattress

(1)

Mattress Firmness

Extra Firm

(15)

Firm

(45)

Medium to Firm

(58)

Medium

(84)

Soft to Medium

(29)

Support System

Pocket Sprung

(184)

Standard Sprung

(28)

Foam Core

(16)

Miracoil

(4)

Posturepedic

(14)

Comfort Layer

Memory Foams

(64)

Natural Fibres

(75)

Gel Foams

(27)

Latex

(15)

Soft White Fibres

(39)

Standard Foam

(14)

Mattress Type

Orthopaedic

(33)

Medical Grade Foam

(4)

Rolled Up

(66)

Single-Sided Mattress

(181)

Double-Sided Mattress

(48)

Hypoallergenic

(68)

Pillow Top

(38)

Contract Mattress

(5)

Luxury Mattress

(66)

Eco Friendly

(36)

Brand

Silentnight

(12)

Sleepeezee

(25)

Sealy

(21)

Hypnos

(17)

Harrison Spinks

(13)

Millbrook Beds

(14)

Emma

(9)

TEMPUR

(3)

Simba

(9)

Relyon

(11)

SleepSoul

(8)

Wentworth Mercer

(10)

Rest Assured

(4)

Luna

(6)

MattressOnline

(9)

Panda

(2)

Mlily

(4)

Horizon

(5)

Uno

(1)

Salus

(3)

Jay-Be

(3)

Romantica

(3)

Bodyshape

(13)

Dunlopillo

(5)

Komfi

(6)

Kaymed

(5)

Aspire

(7)

Copper Fresh

(1)

Alpha

(2)

Price

£0 - £500

(64)

£500 - £1000

(91)

£1000 - £1500

(42)

£1500 - £2000

(20)

£2000 - £2500

(10)

£2500 - £3000

(3)

£3000 - £3500

(1)

Mattress Depth

16cm - 20cm

(13)

21cm - 25cm

(76)

26cm - 30cm

(93)

31cm+

(49)

97-120 of 231 products

Relevance
Biggest Saving
Highest Price
Lowest Price

Millbrook Wool Luxury 1500 Pocket Pillow Top Mattress

100-night comfort trial

RRP £1,327

Sealy Eaglesfield Memory Ortho Plus Mattress

PostureTech Core Support Springs

100-night comfort trial

RRP £719

Copper Fresh Envy Supreme Mattress

We're Collecting Reviews

We're gathering feedback on this product. Only 1 in 20 customers leave a review, so check back soon to see what others think! Rest assured, all products are quality tested to meet our standards.

100-night comfort trial

RRP £1,099

Dunlopillo Meya 1050 Pocket Latex Mattress

100-night comfort trial

King Size£1,149

RRP £1,574

Aspire Pocket+ 1000 Tufted Mattress

Soft White Fibres

100-night comfort trial

RRP £379

Komfi GelMed Comfort Mattress

TrueGel Technology

100-night comfort trial

RRP £1,245

Panda Hybrid Bamboo Mattress Pro

100-night comfort trial

King Size£1,285

RRP £1,390

KomfiMed Ortho Firm Mattress

TrueGel Technology

100-night comfort trial

RRP £1,120

Wentworth Mercer Natural Pocket 1500 Mattress

100-night comfort trial

RRP £816

Sleepeezee Luxury 1400 Pocket Mattress

100-night comfort trial

RRP £849

Sealy Hampton Geltex Enhance 1000 Pocket Mattress

100-night comfort trial

RRP £1,199

Kaymed Smart Phase 1600 Pocket Hybrid Mattress

100-night comfort trial

King Size£1,029

RRP £1,470

Millbrook Wool Luxury Latex 4000 Pocket Mattress

100-night comfort trial

King Size£1,259

RRP £2,177

Harrison Spinks Luxury Essential 750 Pocket Mattress

100-night comfort trial

RRP £859

TEMPUR Ease 20 Mattress

100-night comfort trial

King Size£1,125

RRP £1,199

Rock Hard Super Firm Foam Mattress

100-night comfort trial

RRP £560

SleepSoul Space 4000 Pocket Orthopaedic Gel Mattress

100-night comfort trial

RRP £975

Sleepeezee Classic Ortho 800 Pocket Mattress

Soft White Fibres

100-night comfort trial

RRP £499

Sleepeezee Deluxe 1000 Pocket Mattress

Soft White Fibres

100-night comfort trial

RRP £649

Aspire Natural Cashmere and Silk 3000 Pocket Mattress

100-night comfort trial

RRP £659

Sealy Winslow Geltex Enhance 2400 Pocket Pillow Top Mattress

100-night comfort trial

King Size£1,069

RRP £1,679

Uno Eco-Brease Nova 1000 Pocket Hybrid Mattress

100-night comfort trial

RRP £414

Horizon Juno 5000 Pocket Memory Mattress

100-night comfort trial

RRP £1,250

Relyon Leano 1000 Pocket Mattress

100-night comfort trial

RRP £673

97-120 of 231 products

1

2

3

4

5

6

7

8

9

Sales Enquiries

Mon-Sat: 9:30am - 5:30pm

Sunday: 10am - 4pm

Customer Service

Mon-Sat: 09:30am - 17:30pm

Sunday: Closed

customerservice@mattressonline.co.uk

Good Retail Sustainability Awards 2022

Proudly Supporting the Sleep Charity

Proudly Supporting Zarach

Visa Payments

Mastercard Payments

PayPal Payments

Apple Pay Payments

Google Pay Payments

Klarna Payments

Useful Links

Advice
Contact Us
Delivery
100-Night Mattress Comfort Trial
Mattress Recycling
Our Independent Reviews
Our Awards
Our Experts
The Sleep Journal
About Us
Careers
Press Enquiries
Trade
Visit Our Stores
Help Centre

Popular Categories

Sale
All Mattresses
Double Mattresses
King Size Mattresses
Single Mattresses
Pocket Sprung Mattresses
Memory Foam Mattresses
Orthopaedic Mattresses
Silentnight
Next Day Mattresses

© 2026 MattressOnline.co.uk Ltd|VAT Reg: 838851683|Terms & Conditions|Privacy Policy|Sitemap

MattressOnline.co.uk Ltd is authorised and regulated by the Financial Conduct Authority (FCA FRN 923012) and acts as a credit intermediary and not a lender, offering credit products provided exclusively by Klarna Bank AB (publ). Finance is only available to permanent UK residents aged 18+, subject to status, terms and conditions apply.