Cheapest supermarket for May 2025 named out of Tesco, Asda, Lidl and Aldi

Which? has shared its latest supermarket price comparison, where it looks at the cost of everyday groceries at Tesco, Asda, Morrisons, Sainsbury’s, Lidl, Aldi, Ocado and Waitrose

Woman with shopping basket picking up a product from display rack in retail store.

Which? has revealed its cheapest supermarket for May 2025(Image: Getty)

The UK’s cheapest supermarket for May 2025 has been revealed – and once again Aldi has taken the crown, continuing the discount supermarket chain’s winning streak in Which?’s monthly price comparison.

Which? compared the price of 82 items in April, and the total cost at Aldi sat at an average of £135.48 across the month. Fellow discounter Lidl was close costing only 31p more with the supermarket’s loyalty scheme Lidl Plus and 34p more without at £135.79 and £135.82 respectively.

Waitrose onc again took the crown for the UK’s “most expensive” last month with an average price of £184.03 – which is a whopping £48.55 more expensive than Aldi.

Tesco Clubcard members would have paid £150.26 on average, which is £14.78 more than at Aldi, while without a Clubcard, the Tesco shop sat at £152.35.

For those using a Sainsbury’s Nectar card, May’s shopping list of items averaged £151.82, which is £16.34 more than at Aldi. Without a Nectar card, the same items at Sainsbury’s cost £155.59.

The consumer champion’s monthly analysis compares the average price of a shop of popular groceries at eight of the UK’s biggest supermarkets. The analysis includes both branded and own-brand items, such as Birds Eye Peas, Hovis bread, milk and butter, as well as special offer prices and loyalty prices where applicable, but not multibuys.

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Each month the consumer group compares how much supermarkets charge for a selection of groceries across the eight major UK chains. Alongside the smaller shop, they also cover a larger one too with 198 items.

Aldi and Lidl are not included in this comparison as they have a smaller range of branded products than the other supermarkets.

This month’s winner was Asda, which beat Tesco (with a Clubcard) by £10 and retained its place as one of the UK’s cheapest supermarkets.

Asda’s monthly average sat at £485.79, with Tesco’s Clubcard shop sitting at £496.59. Waitrose was the most expensive on average, with the bigger shop costing £559.02 – a difference of £73.23 compared to Asda.

Reena Sewraz, Which? Retail Editor, said: “Aldi continues to be the UK’s cheapest supermarket in our monthly price analysis for May while Lidl has narrowed the gap to just 31p. For a bigger list of groceries, Asda continues to be the cheapest supermarket, beating shopping at Tesco with a Clubcard by more than £10.

“Food prices are still high and are likely to rise again so many people will be looking to cut costs where they can. Our analysis shows that by switching supermarkets, shoppers could pay up to 36% more, highlighting the advantages of shopping around where possible.”