Prices updated daily — 23 October 2026
Product type overview
yellow onions sits within Potatoes & Onions, part of Vegetables & Fruit. On this page you compare 48 products from 9 UK supermarkets: Aldi, ASDA, Co-op, Iceland, Morrisons, Ocado, Sainsbury's, Tesco and Waitrose. The lowest unit price for yellow onions is £0.15/kg at Waitrose. In total, 5 variants of yellow onions are compared (different pack sizes and compositions). All prices are normalised to the same unit (per kilogram, per litre or per piece) so that packs of different sizes can be compared fairly — a larger pack is not automatically the best value. The ranking below shows, per variant, which supermarket currently has the sharpest price, including own-label products alongside national brands. Prices refresh daily from the retailers' own public price lists, so you never see stale offers when planning your weekly shop. Allsupers uses no affiliate links or paid placement; the ranking is purely price-based and updated from public data.
Cheapest yellow onions
Compare 26 products priced per kilo across 9 supermarkets (48 in total)
yellow onions — compare prices across 9 supermarkets
Waitrose Ltd
Waitrose Onions
1 kg
£0.15/kg
at 1 supermarket
NATURE'S PICK
Brown Onions
1 kg
£0.47/kg
at 1 supermarket
Sainsbury's
Sainsbury's Onions 1kg
1 kg
£0.47/kg
at 1 supermarket
ASDA
ASDA Asda Brown Onions 4kg
4 kg
£0.50/kg
at 1 supermarket
EVERYDAY ESSENTIALS
British Wonky Brown Onions
1 kg
£0.80/kg
at 1 supermarket
JUST ESSENTIALS by ASDA
JUST ESSENTIALS by ASDA Onions 1kg
1 kg
£0.80/kg
at 1 supermarket
TESCO
Tesco Brown Onions Loose
120 g
£0.92/kg
at 1 supermarket
TESCO
Tesco Brown Onions 1Kg
1 kg
£0.95/kg
at 1 supermarket
Morrisons
Morrisons British Brown Onions 1kg
1 kg
£0.95/kg
at 1 supermarket
Sainsbury's
Sainsbury's Onions Loose
1 kg
£0.95/kg
at 1 supermarket
Ocado
Ocado Brown Onions
1 kg
£0.95/kg
at 1 supermarket
M&S
M&S Brown Cooking Onions
1 kg
£0.95/kg
at 1 supermarket
ASDA
ASDA Brown Onions 1kg
1 kg
£0.98/kg
at 1 supermarket
Co-op
Co-op Brown Onions 750g
750 g
£1.07/kg
at 1 supermarket
Iceland
Iceland Onions 1kg
1 kg
£1.25/kg
at 1 supermarket
Waitrose Ltd
Waitrose Small Onions
500 g
£1.92/kg
at 1 supermarket
TESCO ORGANIC
Tesco Organic Brown Onions 750G
750 g
£2.20/kg
at 1 supermarket
Morrisons Organic
Morrisons Organic Brown Onions 500g
500 g
£2.20/kg
at 1 supermarket
Sainsbury's
Sainsbury's Onions, SO Organic 750g
750 g
£2.20/kg
at 1 supermarket
M&S
M&S Organic Brown Onions
750 g
£2.20/kg
at 1 supermarket
Ocado
Ocado Organic Brown Onions
750 g
£2.20/kg
at 1 supermarket
ASDA Organic
ASDA Organic Brown Onions
500 g
£2.20/kg
at 1 supermarket
Waitrose Ltd
Duchy Organic Onions
750 g
£2.47/kg
at 1 supermarket
Morrisons
Morrisons Diced White Onion
400 g
£2.50/kg
at 1 supermarket
DAYLESFORD ORGANIC
Daylesford Organic Brown Onions
500 g
£3.70/kg
at 1 supermarket
M&S
M&S Sweet White Onions
200 g
£5.00/kg
at 1 supermarket