Aldi has been recognized as the most budget-friendly supermarket in 2025 by consumer advocates at Which?. Which? regularly monitors grocery prices and identifies the most economical stores each month. Aldi secured the top spot as the cheapest supermarket in the UK for the fifth consecutive year by being the most cost-effective in ten out of 12 months in 2025.
In December, Aldi proved to be the most affordable option for a selection of 68 items, with an average monthly cost of £123.60. Following closely behind, Lidl ranked second with an average cost of £123.70 for both Lidl Plus members and non-members in December, only 10p more than Aldi.
Throughout the year, Lidl claimed the title of the cheapest supermarket twice, in July and October, with just a 77p average monthly price difference compared to Aldi. In contrast, Asda shoppers paid an average of £134.89 for the same 68 items in December, while Tesco Clubcard members spent £135.84, or £139.12 without a Clubcard.
Sainsbury’s Nectar cardholders spent £141.45 in December, or £143.74 without the card, while Waitrose emerged as the priciest option for the 68-item list, amounting to £170.46 in December. Research from Which? indicated that Waitrose cost 35% more on average than Aldi throughout 2025. In a comparison of a larger weekly shopping list of 180 items, Asda was the most economical choice in December with an average bill of £450.82.
Tesco Clubcard holders spent an average of £462 in December for the same items, while non-Clubcard holders paid £493.53. Morrisons customers faced a bill of £466.04 with a loyalty discount or £467.46 without, while Sainsbury’s Nectar holders paid £468.61, and non-members paid £501.89.
Waitrose retained its position as the priciest option for the larger shopping list, with an average bill of £529.17 in December. The analysis by Which? considered special offers and loyalty prices but excluded multibuy deals.
Reena Sewraz, Which? Retail Editor, commented on Aldi’s consistent cost-effectiveness, highlighting its dominance as the UK’s cheapest supermarket. She also noted Lidl’s competitive pricing and Asda’s appeal for shoppers seeking a wider range of branded goods at lower prices. Sewraz emphasized the importance of comparing prices among supermarkets to potentially save hundreds of pounds annually on food expenses.