How many times a year does Prime Day actually happen
Amazon ran a single Prime Day a year, every July, from 2015 through 2021. In 2022, it added a second event that October, first called the Prime Early Access Sale, and has run an autumn event every year since, now branded Prime Big Deal Days. Both are exclusive to Prime members.
Since 2024, Amazon has also run a third event in spring, the Big Spring Sale. This one genuinely is different: it isn't Prime Day branded, and it's open to shoppers without a Prime membership too, though Prime members still get some extra badge deals within it. So the precise answer is three sale events a year in total, but only two of them are actually called Prime Day and require membership to shop.
What you need to shop it, and what Prime costs
Both Prime Day events are gated behind a Prime membership, though a free trial (Amazon currently offers 30 days) counts. Standard UK Prime pricing, correct at the time of writing on Amazon's own page, is £8.99 a month or £95 a year, check Amazon's current price directly since it has changed before and we won't guarantee it holds indefinitely.
The spring Big Spring Sale doesn't need any of this, non-members can shop it directly, which is the clearest practical difference between it and the two Prime Day events.
The real 50% off Prime UK offer, and the one it isn't
A genuine 50% membership discount exists, and has done since 2014, but it's eligibility-gated, not a code anyone can enter. It applies to two groups: anyone enrolled at a UK or Republic of Ireland higher-education institution, and separately, anyone aged 18 to 24 regardless of student status. Both bring membership to £4.49 a month or £47.49 a year, after a 6-month free trial, renewing until you graduate or turn 25.
What that "50%" claim is not: a general discount code for any shopper, or the same thing as marketing copy advertising "up to 50% off" on products during a sale event. Those are two entirely different claims wearing the same number, and conflating them is exactly why the search for this gets confusing.
Are Prime Day discounts actually genuine
Which? ran a direct investigation, published 4 October 2025, tracking 34 popular Prime Day products across 6 to 12 months of price history rather than trusting the discount badge. The headline finding is genuinely reassuring: 85% of the deals were the cheapest price in the prior 6 months, a real saving by most people's definition.
The catch sits underneath that number. Only 9% beat the single cheapest price recorded across that entire 6-to-12-month window, so most "deals" were good, not record-breaking. More significantly, 35% of the products tracked had never actually sold at their stated RRP at any point in the prior 6 months, meaning the reference price the advertised percentage off was calculated against often wasn't a real, recent selling price at all.
The practical takeaway: the price you'd actually pay is usually genuinely competitive, but the percentage on the badge is frequently measured against a number that doesn't reflect what anyone was really paying beforehand. Check a price-history tool such as Keepa or camelcamelcamel, or Amazon's own price history panel on the product page, before trusting the badge's percentage specifically.
About this page
LightningBrands checks every deal we feature against Amazon's live listing at the time we publish it, the same discipline this page recommends applying to Prime Day's own discount badges. We deliberately haven't stated a specific year's exact date here, since Amazon confirms dates only shortly before each event and even the general timing has shifted year to year.
See the best websites to find daily Amazon deals for where else to check, or today's hand-checked deals on this site.