Diet Coke Deals

DealRobin compares currently verifiable Diet Coke deals in the UK. The tables below compare matching pack sizes using the effective promotional price, price per litre and price per can.

Current best verified Diet Coke bottle price: Tesco — 75p per litre
Buy two 2-litre bottles for £3 with Clubcard. Checked 10 September 2026.

Diet Coke bottle prices

Retailer	Product	Normal	Offer	Effective price	Per litre	Ends	Checked
Tesco	2L bottle	£2.05	Any 2 for £3 Clubcard	£1.50 each	£0.75/L	23 Feb 2027	10 Sep 2026
Tesco	1.25L bottle	£1.65	Any 3 for £3 Clubcard	£1.00 each	£0.80/L	21 Sep 2026	10 Sep 2026
Tesco	Caffeine Free 2L bottle	£2.09	Any 2 for £3 Clubcard	£1.50 each	£0.75/L	23 Feb 2027	10 Sep 2026

Diet Coke can multipack prices

Retailer	Product	Normal	Offer	Per can	Per litre	Ends	Checked
Sainsbury’s	24 × 330ml	£12.00	£8.50 Nectar	35.42p	£1.07/L	Not published	10 Sep 2026
Tesco	15 × 330ml	£7.90	Any 2 for £11 Clubcard	36.67p	£1.11/L	21 Sep 2026	10 Sep 2026
Tesco	8 × 330ml	£4.25	£3.50 Clubcard	43.75p	£1.33/L	13 Oct 2026	10 Sep 2026
Tesco	Caffeine Free 8 × 330ml	£4.25	£3.50 Clubcard	43.75p	£1.33/L	13 Oct 2026	10 Sep 2026
Tesco	24 × 330ml	£12.00	—	50.00p	£1.52/L	—	10 Sep 2026
Sainsbury’s	18 × 330ml	£9.50	—	52.78p	£1.60/L	—	10 Sep 2026
Tesco	6 × 200ml mini cans	£3.50	—	58.33p	£2.92/L	—	10 Sep 2026
Tesco	12 × 150ml mini cans	£6.40	£4.50 Clubcard	37.50p	£2.50/L	7 Oct 2026	10 Sep 2026

How to compare Diet Coke offers

Use the effective promotional price when the required quantity and loyalty terms suit you. Price per litre is the fairest comparison across bottles and cans; price per can is useful when choosing multipacks. Every retained row was checked on 10 September 2026.

Price notice: Prices, availability and loyalty offers can change. Confirm the retailer price before buying. Some links may be affiliate links.