Is caffeine free Diet Coke included in the same offers?

Sometimes. Multibuy offers on 2 litre bottles often include several eligible versions, but not always. Check that the retailer lists the caffeine free bottle as eligible before you add it to your basket.

What is the most cost-effective way to buy Diet Coke?

On most checks, two eligible 2 litre bottles on a multibuy offer cost least per litre. If you prefer cans, larger multipacks usually cost less per can than small packs. Compare using the price per litre shown in the comparison.

How do I check a Diet Coke deal is still live?

Follow the retailer link on the deal and check the price, stock and delivery options on the retailer's own page. DealRobin updates offers regularly, but the retailer's checkout always shows the final price.

Brand deals

Diet Coke voucher codes, coupons & deals

Compare Diet Coke prices on bottles and cans at Tesco, Sainsbury’s, Asda, Morrisons, Waitrose, Ocado and Amazon, with today’s Diet Coke deals below.

View Diet Coke price comparison and buying guide

Diet Coke price comparison

Every price is also shown per litre, with bottles and cans in separate tables. For regular and Zero Sugar Coke see the Coca-Cola price comparison.

All prices checked on 6–7 Nov 2026 at each retailer’s own product page. Loyalty-card prices (such as Clubcard, Nectar or More Card) need that card, and multibuy prices need the full number of items. Prices and stock can change after checking, so confirm the price at the retailer before buying.

Lowest price per litre found in this check

Bottles: Diet Coke 2L bottle at Tesco, £1.50 each (any 2 for £3 with Clubcard), which is £0.75 per litre.
Cans: Diet Coke 24 × 330ml cans at Amazon, £8.00, which is £1.01 per litre.

These are the lowest prices among the products we checked, not every pack sold in the UK.

Bottles

Retailer	Product	Price	Offer	Per litre, best price	Checked	Buy
Tesco	Diet Coke 2L bottle	£2.05	Any 2 for £3 with Clubcard, ends 23 Feb 2027	£0.75	6 Nov 2026	View at Tesco
Asda	Diet Coke 2L bottle	£2.08	Any 2 for £3	£0.75	7 Nov 2026	View at Asda
Sainsbury’s	Diet Coke 2L bottle	£2.45	Any 2 for £3 with Nectar, ends 24 Nov 2026	£0.75	7 Nov 2026	View at Sainsbury’s
Morrisons	Diet Coke 2L bottle	£2.15	Buy 2 for £3, ends 10 Nov 2026	£0.75	7 Nov 2026	View at Morrisons
Ocado	Diet Coke 2L bottle	£2.15	Any 2 for £3, ends 1 Dec 2026	£0.75	7 Nov 2026	View at Ocado
Tesco	Diet Coke Caffeine Free 2L bottle	£2.25	Any 2 for £3 with Clubcard, ends 23 Feb 2027	£0.75	7 Nov 2026	View at Tesco
Tesco	Diet Coke Cherry 2L bottle	£2.09	Any 2 for £3 with Clubcard, ends 23 Feb 2027	£0.75	7 Nov 2026	View at Tesco
Tesco	Diet Coke 1.25L bottle	£1.65	Any 3 for £3 with Clubcard, ends 26 Jan 2027	£0.80	6 Nov 2026	View at Tesco
Waitrose	Diet Coke 2L bottle	£2.55	Any 2 for £3.50 (mix and match)	£0.88	7 Nov 2026	View at Waitrose

Cans

Retailer	Product	Price	Offer	Per litre, best price	Checked	Buy
Amazon	Diet Coke 24 × 330ml cans	£8.00	—	£1.01	6 Nov 2026	View at Amazon
Morrisons	Diet Coke 24 × 330ml cans	£8.00	—	£1.01	7 Nov 2026	View at Morrisons
Tesco	Diet Coke 8 × 330ml cans	£4.25	£3.50 Clubcard, ends 8 Dec 2026	£1.33	6 Nov 2026	View at Tesco
Tesco	Diet Coke 24 × 330ml cans	£12.00	—	£1.52	6 Nov 2026	View at Tesco
Asda	Diet Coke 24 × 330ml cans	£12.00	—	£1.52	7 Nov 2026	View at Asda
Sainsbury’s	Diet Coke 24 × 330ml cans	£12.00	—	£1.52	7 Nov 2026	View at Sainsbury’s
Waitrose	Diet Coke 24 × 330ml cans	£12.00	—	£1.52	7 Nov 2026	View at Waitrose
Ocado	Diet Coke 24 × 330ml cans	£12.50	—	£1.58	7 Nov 2026	View at Ocado
Tesco	Diet Coke 15 × 330ml cans	£7.90	—	£1.60	6 Nov 2026	View at Tesco
Tesco	Diet Coke mini cans 12 × 150ml	£6.40	—	£3.56	7 Nov 2026	View at Tesco

How we compare: the unit price uses the lowest price shown for that pack, including loyalty and multibuy prices, which are always labelled. Where an Amazon item is sold by another seller, we say so. Prices are re-checked every month; if a retailer stops showing a price, we show the last price we found and its date.