Prices updated daily — 21 July 2026
Product type overview
yellow onions sits within Potatoes & Onions, part of Vegetables & Fruit. On this page you compare 43 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 £0.16/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 43 products across 9 supermarkets
yellow onions — compare prices across 9 supermarkets
Waitrose Ltd
Waitrose Onions
1 kg
£0.16/kg
at 1 supermarket
TESCO
Tesco Brown Onions 3 Pack
3 pieces
£0.32/unit
at 1 supermarket
NATURE'S PICK
Large Brown Onions
3 pieces
£0.32/unit
at 1 supermarket
Morrisons
Morrisons Brown Onions 3 Pack
3 pieces
£0.32/unit
at 1 supermarket
Waitrose Ltd
Waitrose Onions
4 pieces
£0.32/unit
at 1 supermarket
Sainsbury's
Sainsbury's Brown Onions x3
3 pieces
£0.32/unit
at 1 supermarket
Co-op
Co-op Onions 3pk
3 pieces
£0.32/unit
at 1 supermarket
Ocado
Ocado Brown Onions
3 pieces
£0.32/unit
at 1 supermarket
Iceland
Iceland 3pk Onions
3 pieces
£0.33/unit
at 1 supermarket
M&S
M&S Brown Cooking Onions
3 pieces
£0.43/unit
at 1 supermarket
NATURE'S PICK
Extra Large Mild Onions
3 pieces
£0.50/unit
at 1 supermarket
Sainsbury's
Sainsbury's Sweet Onions, Taste the Difference x3
3 pieces
£0.55/unit
at 1 supermarket
M&S
M&S Select Farms Mild Sweet Onions
3 pieces
£0.60/unit
at 1 supermarket
Morrisons The Best
Morrisons The Best Sweet White Onions - 2 pack
2 pieces
£0.62/unit
at 1 supermarket
Morrisons
Morrisons Large Mild Brown Onions
3 pieces
£0.70/unit
at 1 supermarket
Sainsbury's
Sainsbury's Extra Large Brown Onions x2
2 pieces
£0.70/unit
at 1 supermarket
Ocado
Ocado Extra Large Brown Onions
2 pieces
£0.78/unit
at 1 supermarket
TESCO finest
Tesco Finest Extra Large Brown Onions 2 Pack
2 pieces
£0.80/unit
at 1 supermarket
Waitrose Ltd
Waitrose Large Onions
2 pieces
£0.80/unit
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
NATURE'S PICK
Brown Onions
1 kg
£0.95/kg
at 1 supermarket
Sainsbury's
Sainsbury's Onions 1kg
1 kg
£0.95/kg
at 1 supermarket
Morrisons
Morrisons British Brown Onions 1kg
1 kg
£0.99/kg
at 1 supermarket
Market Street
Morrisons British Loose Onion
160 g
£1.00/kg
at 1 supermarket
Ocado
Ocado Brown Onions
1 kg
£1.00/kg
at 1 supermarket
M&S
M&S Brown Cooking Onions
1 kg
£1.00/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
Natoora
Natoora White Onions
2 pieces
£1.50/unit
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
Ocado
Ocado Organic Brown Onions
750 g
£2.20/kg
at 1 supermarket
M&S
M&S Organic Brown Onions
750 g
£2.33/kg
at 1 supermarket
Waitrose Ltd
Waitrose Duchy Organic Onions
750 g
£2.40/kg
at 1 supermarket
Waitrose Ltd
Waitrose Small Onions
500 g
£2.40/kg
at 1 supermarket
Morrisons
Morrisons Diced White Onion
400 g
£2.50/kg
at 1 supermarket
Wholegood
Wholegood Organic Onions
1.5 kg
£2.53/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
Sainsbury's
Sainsbury's Onions Loose
Price per unit unknown
at 1 supermarket
Unbranded
Stamford Street Co. Onions
Price per unit unknown
at 1 supermarket