Size 13 women's trainers & sport shoes in the UK
You can get great deals on large size shoes at Amazon with a bit of patience. There's usually a good choice up to size 10 UK. Their own Amazon Essentials range now goes up to size 11 UK, with fashionable styles at great prices. The women's shoes department goes right up to 14 UK, although many of the largest sizes will either be Chinese brands or unisex. There's free returns within the UK for most shoes sold/fulfilled by Amazon & if you've got Prime, you can even try before you buy.
Adidas does lots of women's fashion sneakers, running & sports shoes up to size 11 us (9.5 uk, 44 eu). For those outside the US, I usually need to go up half a size in Adidas (9.5 uk/44 instead of 9), whereas I find Nike true to size. They are moving towards gender neutral collections, and some of their unisex/men's shoes go right up to women's size 20 us (18 uk). Ships to most of world. Free shipping & returns for most countries if you sign up for a free account. You can also get a first order discount by joining their mailing list. Generous student, healthcare & military discount available.
Nike does lots of women's shoes up to size 12 us (9.5 uk, 44.5 eu) online including customisable styles. Some unisex and men's styles go right up to 17 uk corresponding to a women's size 19.5 us. Sign up for a free Nike account to get free shipping & returns. Even better: you can return worn shoes & clothes to Nike if you're not happy - very rare! I find Nikes run true to size & last well. Read my Flex Experience Run 10s review.
Sustainable casual & running shoes made with natural materials. Several Allbird styles are unisex & available via the men’s collection up to size 15 US, 13 UK or 47 EU. Allbirds also offer free returns and a 30 day trial, so you can still get a refund even after wearing the shoes which is rare.
All taxes & duties paid for UK & US orders. Irish web store shipping worldwide specialising in shoe sizes 8-12 uk (up to 14 us or 46 eu). Some sandals and slippers available in size 13 uk (15 us). Wide range of brands & styles. UK, EU and North American orders can be returned to a local address.