Aldi has been recognized as the most affordable supermarket in 2025 by consumer advocacy group Which?. Which? conducts a daily monitoring of grocery prices and discloses the most budget-friendly stores on a monthly basis. Aldi claimed the top spot as the cheapest supermarket for ten out of the 12 months in 2025, solidifying its position as the UK’s most cost-effective supermarket for the fifth consecutive year.
In December, Aldi emerged as the most economical option for a selection of 68 items, with an average monthly cost of £123.60. Lidl followed closely behind, costing just 10p more at £123.70 for both Lidl Plus members and non-members during the same month. Lidl briefly held the title of the cheapest supermarket twice in 2025, in July and October, with only a 77p average monthly price difference compared to Aldi throughout the year.
Comparatively, for the same 68 items, Asda’s average cost in December was £134.89, while Tesco Clubcard members paid £135.84 or £139.12 without a Clubcard.
Sainsbury’s Nectar card holders spent £141.45, or £143.74 without a Nectar card, whereas Waitrose topped the list as the priciest supermarket for the 68-item selection, totaling £170.46 in December. Which? research indicated that Waitrose’s prices were on average 35% higher than Aldi’s throughout 2025. The study also included an analysis of the cost for a larger weekly shopping list of 180 items.
Aldi and Lidl were excluded from the larger shopping comparison due to their smaller product range. Asda took the lead in December for the 180-item list, with an average bill of £450.82. Tesco Clubcard holders paid an average of £462 for the same items in December, while non-Clubcard holders paid £493.53.
Morrisons customers saw a bill of £466.04 with a loyalty discount or £467.46 without. Sainsbury’s Nectar card holders paid £468.61, while non-members paid £501.89. Waitrose remained the most expensive option for the larger shopping list, with an average bill of £529.17. The analysis factored in special offers and loyalty prices where applicable, excluding multi-buy deals.
Commenting on the findings, Reena Sewraz, Which? Retail Editor, highlighted Aldi’s consistent affordability as the reason behind its fifth consecutive win as the UK’s cheapest supermarket. Sewraz also noted that while Lidl remains a strong competitor in the discount market, Aldi consistently offered lower prices overall.
Sewraz advised shoppers to consider Asda for a broader range of branded goods at lower prices. With food costs remaining a significant concern for many households, choosing a supermarket wisely could lead to substantial savings over the course of a year.
