Aldi has been declared the most affordable supermarket in 2025 by consumer advocates at Which?. Which? monitors grocery prices daily and unveils the least expensive stores monthly. In 2025, Aldi clinched the top spot as the UK’s cheapest supermarket for the fifth consecutive year, being the most economical supermarket in ten out of 12 months.
For a set of 68 items in December, Aldi was the most budget-friendly at an average cost of £123.60. Lidl followed closely behind, costing just 10p more in December with an average of £123.70 for both Lidl Plus members and non-members. Lidl held the title of the cheapest supermarket twice in 2025, specifically in July and October, with a mere 77p average monthly price difference compared to Aldi.
In contrast, Asda’s average cost for the same 68 items in December was £134.89, while Tesco Clubcard members would have paid £135.84, or £139.12 without a Clubcard. Sainsbury’s Nectar cardholders spent £141.45, or £143.74 without a Nectar card, while Waitrose emerged as the priciest supermarket for the list of 68 items, totaling £170.46 in December.
Which? research disclosed that Waitrose was on average 35% more expensive than Aldi throughout 2025. Furthermore, a comparison for a larger weekly shopping list of 180 items excluded Aldi and Lidl due to their smaller product range. Asda was the most economical in December for the extended list, reaching an average bill of £450.82.
For the same list of items in December, Tesco Clubcard holders’ average expenditure was £462, while non-Clubcard Tesco shoppers paid £493.53. Morrisons customers faced a bill of £466.04 with a loyalty discount or £467.46 without. Sainsbury’s Nectar cardholders would have paid £468.61, while non-Nectar cardholders would have paid £501.89.
At £529.17, Waitrose remained the costliest option for the larger shopping list. The Which? analysis considered special offers and loyalty prices where applicable but excluded multibuys.
Reena Sewraz, Which? Retail Editor, emphasized Aldi’s consistent affordability and position as the UK’s cheapest supermarket. She highlighted Aldi’s dominance over Lidl in offering the lowest prices overall, advising shoppers to consider the significant savings possible by choosing supermarkets wisely.