Prices updated daily — 8 October 2026
Product type overview
red onions sits within Potatoes & Onions, part of Vegetables & Fruit. On this page you compare 29 products from 9 UK supermarkets: Aldi, ASDA, Co-op, Iceland, Morrisons, Ocado, Sainsbury's, Tesco and Waitrose. The lowest unit price for red onions is £0.17/kg at Waitrose. In total, 4 variants of red 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 red onions
Compare 29 products across 9 supermarkets
red onions — compare prices across 9 supermarkets
Waitrose Ltd
Waitrose Red Onions
1 kg
£0.17/kg
at 1 supermarket
ASDA
ASDA 3 Sweet & Crunchy Red Onions
3 pieces
£0.32/unit
at 1 supermarket
NATURE'S PICK
Large Red Onions
3 pieces
£0.32/unit
at 1 supermarket
Morrisons
Morrisons Red Onions 3 Pack
3 pieces
£0.32/unit
at 1 supermarket
Sainsbury's
Sainsbury's Red Onions x3
3 pieces
£0.32/unit
at 1 supermarket
TESCO
Tesco Red Onions 3Pack Minimum
3 pieces
£0.33/unit
at 1 supermarket
Waitrose Ltd
Waitrose Red Onions
3 pieces
£0.33/unit
at 1 supermarket
Iceland
Iceland 3pk Red Onions
3 pieces
£0.33/unit
at 1 supermarket
Ocado
Ocado Red Onions
3 pieces
£0.33/unit
at 1 supermarket
Co-op
Co-op Red Onions 3 pack
3 pieces
£0.40/unit
at 1 supermarket
M&S
M&S Red Onions
3 pieces
£0.40/unit
at 1 supermarket
TESCO finest
Tesco Finest Rosanna Pink Onions 3 Pack
3 pieces
£0.48/unit
at 1 supermarket
JUST ESSENTIALS by ASDA
JUST ESSENTIALS by ASDA Just Essentials Red Onions 1kg
1 kg
£0.65/kg
at 1 supermarket
TESCO
Tesco Red Onions Pack 1Kg
1 kg
£0.80/kg
at 1 supermarket
ASDA
ASDA Sweet & Crunchy Red Onions 1kg
1 kg
£0.95/kg
at 1 supermarket
TESCO
Tesco Red Onions Loose
210 g
£0.95/kg
at 1 supermarket
NATURE'S PICK
Red Onions
1 kg
£0.95/kg
at 1 supermarket
Morrisons
Morrisons British Red Onions 1kg
1 kg
£0.95/kg
at 1 supermarket
Sainsbury's
Sainsbury's Red Onions Loose
1 kg
£0.95/kg
at 1 supermarket
Sainsbury's
Sainsbury's Red Onions 1kg
1 kg
£0.95/kg
at 1 supermarket
Ocado
Ocado Red Onions
1 kg
£0.95/kg
at 1 supermarket
M&S
M&S Red Cooking Onions
1 kg
£0.95/kg
at 1 supermarket
ASDA Organic
ASDA Organic Organic Red Onions
500 g
£2.62/kg
at 1 supermarket
Ocado
Ocado Organic Red Onions
750 g
£2.87/kg
at 1 supermarket
Sainsbury's
Sainsbury's Red Onions, SO Organic 500g
500 g
£2.90/kg
at 1 supermarket
M&S
M&S Organic Red Onions
500 g
£2.90/kg
at 1 supermarket
Waitrose Ltd
Duchy Organic Red Onions
500 g
£3.20/kg
at 1 supermarket
Natoora
Natoora Pink Onions from Brittany
450 g
£10.56/kg
at 1 supermarket
TESCO ORGANIC
Tesco Organic Red Onions
Price per unit unknown
at 1 supermarket