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Cheapest Onions in the UK

Prices updated 13 October 2026 · 116 products across 7 supermarkets

The best-value onions in the UK right now is JUST ESSENTIALS by ASDA Just Essentials Red Onions 1kg at Asda — £0.65/kg (£0.65).
116Products Compared
7Supermarkets
£0.65Lowest /Kg

We compare onions across all 7 major UK supermarkets — Tesco, Sainsbury's, Asda, Morrisons, Waitrose, Aldi and M&S — and rank by price per unit so you can see where onions is genuinely cheapest. Prices update daily.

1JUST ESSENTIALS by ASDA Just Essentials Red Onions 1kgJUST ESSENTIALS by ASDA Just Essentials Red Onions 1kgAsdaBest value£0.65/kg£0.652Morrisons British Loose Onion 0.1kg - 0.22kgMorrisons British Loose Onion 0.1kg - 0.22kgMorrisons£0.68/kg£0.153NATURE'S PICK Brown Onions 1 KGNATURE'S PICK Brown Onions 1 KGAldi£0.69/kg£0.694EVERYDAY ESSENTIALS British Wonky Brown Onions 1 KGEVERYDAY ESSENTIALS British Wonky Brown Onions 1 KGAldi£0.80/kg£0.805JUST ESSENTIALS by ASDA Onions 1kgJUST ESSENTIALS by ASDA Onions 1kgAsda£0.80/kg£0.806Stamford Street Co. OnionsStamford Street Co. OnionsSainsbury's£0.85/kg£0.857Tesco Brown Onions LooseTesco Brown Onions LooseTesco£0.95/kg£0.118Tesco Brown Onions 1KgTesco Brown Onions 1KgTesco£0.95/kg£0.959Tesco Red Onions Pack 1KgTesco Red Onions Pack 1KgTesco£0.95/kg£0.9510Tesco Red Onions LooseTesco Red Onions LooseTesco£0.95/kg£0.2011Tesco Pink Onions 1KgTesco Pink Onions 1KgTesco£0.95/kg£0.9512NATURE'S PICK Red Onions 1 KGNATURE'S PICK Red Onions 1 KGAldi£0.95/kg£0.9513Sainsbury's Onions LooseSainsbury's Onions LooseSainsbury's£0.95/kg£0.9514Sainsbury's Red Onions LooseSainsbury's Red Onions LooseSainsbury's£0.95/kg£0.9515Sainsbury's Onions 1kgSainsbury's Onions 1kgSainsbury'sNectar £0.80£0.95/kg£0.9516Sainsbury's Red Onions 1kgSainsbury's Red Onions 1kgSainsbury's£0.95/kg£0.9517ASDA Sweet & Crunchy Red Onions 1kgASDA Sweet & Crunchy Red Onions 1kgAsda£0.95/kg£0.9518Morrisons British Brown Onions 1kgMorrisons British Brown Onions 1kgMorrisons£0.95/kg£0.9519Morrisons British Red Onions 1kgMorrisons British Red Onions 1kgMorrisons£0.95/kg£0.9520M&S Brown Cooking Onions 1kgM&S Brown Cooking Onions 1kgM&S£0.95/kg£0.9521M&S Red Cooking Onions 1kgM&S Red Cooking Onions 1kgM&S£0.95/kg£0.9522NATURE'S PICK Brown Onions 1 kgNATURE'S PICK Brown Onions 1 kgAldi£0.95/kg£0.9523ASDA Brown Onions 1kgASDA Brown Onions 1kgAsda£0.98/kg£0.9824Waitrose Red OnionsWaitrose Red OnionsWaitrose£1.00/kg£0.17
See The Live Onions Comparison →

Cheapest Onions: FAQ

Where is the cheapest onions in the UK?

Right now the best value onions is JUST ESSENTIALS by ASDA Just Essentials Red Onions 1kg at Asda, £0.65 (£0.65/kg). SmartShelf ranks onions by price per unit across 7 supermarkets, updated daily.

Which supermarket is cheapest for onions?

We compare onions across Tesco, Sainsbury's, Asda, Morrisons, Waitrose, Aldi and M&S. Today Asda has the cheapest option, but the ranking updates every day as prices change.

How does SmartShelf compare onions prices?

We list each product's price per unit (£/kg, £/litre or per item) so you compare like for like, and we show loyalty prices such as Clubcard and Nectar where available — free, with no sign-up.