Aldi has been recognized as the most affordable supermarket in 2025 according to consumer advocates at Which?. The organization tracks grocery prices daily and discloses the least expensive stores each month. Aldi claimed the top spot as the cheapest supermarket in the UK for the fifth consecutive year by being the most economical store in ten out of the 12 months in 2025.

In December, Aldi was the most budget-friendly supermarket for a selection of 68 items, with an average monthly cost of £123.60. Lidl followed closely in second place, only 10p pricier than Aldi with an average cost of £123.70, applicable for both Lidl Plus members and non-members in December.

Lidl held the title of the most inexpensive supermarket twice in 2025, specifically in July and October, with just a 77p average monthly price difference compared to Aldi throughout the year.

For the same basket of 68 items at Asda, the average expenditure in December was £134.89, while Tesco Clubcard members paid £135.84 or £139.12 without a Clubcard.

Sainsbury’s Nectar cardholders paid £141.45, or £143.74 without the card. Waitrose emerged as the priciest supermarket for the 68-item list, costing £170.46 in December, which was 35% more expensive on average compared to Aldi in 2025, as per Which? research. Additionally, the comparison extended to a larger weekly shopping list of 180 items.

Aldi and Lidl were excluded from the larger shopping list comparison due to their limited product ranges. Asda was the most economical in December for the 180-item list, with an average bill of £450.82. Tesco Clubcard holders spent £462 on average, while Tesco non-Clubcard shoppers spent £493.53 in December for the same items.

Morrisons customers had a bill of £466.04 with a loyalty discount or £467.46 without, whereas Sainsbury’s Nectar cardholders spent £468.61, and non-members paid £501.89.

Waitrose maintained its position as the priciest supermarket for the larger shopping list, with an average bill of £529.17. The analysis by Which? considered special offers and loyalty prices but excluded multi-buy deals.

Reena Sewraz, Which? Retail Editor, commented on Aldi’s consistent performance, highlighting its fifth consecutive win as the UK’s most affordable supermarket. She also emphasized Asda’s attractiveness for shoppers seeking a broader range of branded goods at competitive prices.

With food expenses remaining a significant concern for many households, the advice is to compare prices diligently as opting for one supermarket over another could lead to substantial savings over a year.