Kia Stonic Review 2025: Price, specs & boot space

Wander into the showroom of any mainstream car manufacturer and you’ll be greeted with a small SUV of some description. So what makes the Kia Stonic different to any of its many rivals?

In truth, not a lot. It follows the same basic formula as the rest, offering a touch more practicality than the supermini upon which it is based, along with some chunky and fashionable SUV styling.

Beyond that, it comes down to brand loyalty, price and peace of mind. The Stonic is backed by Kia’s excellent seven-year warranty and you do get a lot of toys for your money. However, when viewed in the context of its rivals, it feels the least like a small SUV. This may or may not be a good thing, depending on your point of view.

In isolation, it’s a thoroughly good small car. But there are more authentic small SUVs available.

How long have you got? Every mainstream manufacturer offers a small SUV of some description, but the Stonic’s chief rivals include the Hyundai Kona, Renault Captur, SEAT Arona, Suzuki Vitara, Nissan Juke, Peugeot 2008 and Citroen C3 Aircross.

The Stonic also faces an enemy from within. The Kia Xceed is more expensive, but it looks and feels more special than the Stonic.

First impressions are excellent. Kia has a knack of making its interiors look more upmarket than prices would suggest, and at first glance, you initially think that the Korean company has done it again.

Unfortunately, look a little closer and things start to unravel. The plastic used on the dashboard, door panels and centre console feel cheap and scratchy. The cost-cutting is especially noticeable in the entry-level Stonic, with the fabric seats feeling a little low-rent, while the silver-finished door handles are a tad flimsy.

Kia has trimmed the steering wheel and gearstick in leather, which helps to raise the level of perceived quality a little. The flat-bottomed steering wheel in the Stonic 3 is a nice touch, too.

The Stonic 3 also gets a black high-gloss centre console, faux leather upholstery, automatic climate control and an auto-dimming rear-view mirror. For ultimate indulgence, the Stonic 4 features heated front seats, a heated steering wheel, keyless start, faux leather and aluminium pedals.

Although the Kia XCeed is larger and more expensive, it feels more premium on the inside. The Stonic is by no means poor, it just lacks sparkle.

All versions of the Kia Stonic get a seven-inch touchscreen infotainment system with DAB digital radio, Apple CarPlay, Android Auto, Bluetooth and voice control. There’s also a USB port for the front seats, another one for the back, six speakers and audio controls on the steering wheel.

It’s easy to use, helped in no small part by the large and prominent buttons and dials flanking the screen. The display is crisp and clear, although it can be a little slow to respond to inputs.

The Kia Stonic 3 and 4 get an upgraded system with satellite navigation, traffic messaging and a range of connected services. It’s worth the extra expense, but we’d still favour the mapping services offered by Apple CarPlay and Android Auto. The Kia’s navigation has a habit of sending drivers on some obscure routes, especially when avoiding traffic delays.

On the plus side, the sound quality is excellent for a standard audio system, aided by a pair of tweeters mounted in the doors. We also applaud Kia’s decision to put a USB port in the back, because the passengers seated there could use some cheering up due to their drab surroundings.

While the Kia Stonic and Rio hatchback share the same wheelbase (that's the space between the front and rear wheels), the overall dimensions of the Stonic are slightly bigger. The Stonic is 4140mm long, 1760mm wide and 1520mm high. Crucially, the rear overhang has been extended by 70mm (compared to the Kia Rio), which gives the Stonic a larger boot.

With the rear seats in place, the Kia Stonic's boot offers 352 litres of space, which is 27 litres more than you get in the Rio. It’s not the largest in the small SUV segment - for example, the Renault Captur offers up to 536 litres thanks to a sliding rear seat, which is something you don’t get in the Stonic - but the Stonic’s boot benefits from a wide and tall opening.

There’s a relatively high loading lip, but the Stonic scores well for its 60/40 split-folding rear seats, which fold flat to deliver up to 1155 litres of luggage capacity. Again, this is good, but not great. You also need to buy the Stonic 4 to benefit from a dual-height boot floor and a luggage net, which seems a bit mean.

While there’s plenty of shoulder room and headroom in the front, things are a little tighter in the back. Adults will struggle for legroom if there are tall people in the front, while headroom is restricted for all but the shortest of adults. You’d expect more from a small SUV.

Space for oddments is also at a premium in the back, with Kia offering just one seatback pocket and a pair of small door bins. What’s more, you wouldn’t want to sit in the middle seat for any length of time because it's a little uncomfortable. There are two ISOFIX points for child car seats, though.

Storage is a little better in the front, with the Kia Stonic packing a pair of large door pockets, a big glovebox and a spacious central storage bin. There’s also ample space for a smartphone in the centre console.

There are two cupholders in the front, a light in the glovebox, luggage net hooks in the boot, a case for sunglasses above the windscreen, plus a 12v socket in the centre console.

Although a 99PS 1.4-litre MPI petrol engine was available at launch, it has since been deleted from the Stonic range, being replaced by the 99PS 1.0-litre T-GDi unit, a turbocharged three-cylinder petrol engine that has a slightly more eager power delivery.

The 1.0-litre T-GDi unit is also available with 120PS, and that's the sweet spot of the range. It's enough to propel the Stonic to 62mph in a respectable 9.9 seconds, before hitting a top speed of 114mph. It’s also pretty frugal, offering up to 47.1mpg on a combined cycle. The economy and the 0-62mph time suffer if you opt for the seven-speed automatic transmission, though.

A 115PS 1.6-litre CRDi engine is offered, but we find it hard to recommend unless you spend a lot of time on the motorway. It’s a characterless engine that will pull the car from a standstill to 62mph in 10.5 seconds before reaching a top speed of 112mph. It also offers 56.5mpg in official tests.

In all cases, the engine sounds coarse and noisy when you’re accelerating hard, while the diesel is also too audible at idle and motorway speeds. Aside from the improved economy on a long run, we don’t see why you’d choose the 1.6-litre diesel over the peppy 1.0-litre petrol.

As for the transmissions, the six-speed manual gearbox is satisfying enough, but the smooth and relaxed dual-clutch automatic would be our choice. Unfortunately, it’s not available on the entry-level Stonic.

The Kia Stonic lacks refinement, which is especially noticeable if you’ve experienced the bigger XCeed. There’s plenty of wind- and road noise at motorway speeds, while the firm suspension gives the Stonic an unsettled and fidgety feel.

We’d avoid the 1.6-litre CRDi diesel, which delivers plenty of clatter when idling and a significant amount of noise under load and when cruising. There’s also a curious metallic sound when you lift off the accelerator, too.

Things are no better in the petrol versions of the Stonic. The 1.4-litre MPI four-cylinder engine feels dated and has to be pushed hard to make real progress.

The modern 1.0-litre turbocharged engine is a better unit, but some people won’t like the thrum of the three-cylinder unit. We’d argue that it injects the Stonic with some much-needed character, but maybe we’re being too generous. Overall, the Stonic lacks the comfort, refinement and quality we’d expect from a mid-range small SUV. The Seat Arona is proof that a small SUV can be good at everything.

The Kia Stonic has been awarded two safety ratings by Euro NCAP. One is for high-spec versions with the full suite of driver assistance systems, the other is for lower-end versions without the safety kit (however, both ratings have now expired as the tests took place in 2017 and Euro NCAP says ratings only apply for a five year period due to ever-increasing safety standards).

With everything fitted, the Stonic got a maximum five-star rating, with scores of 93% for adult occupant protection, 84% for child occupant protection, 71% for pedestrian safety, and 59% for safety assist technology.

Without the safety pack, however, these scores drop to 85% for adult occupant protection, 84% for child occupant protection, 62% for pedestrian safety, and 25% for safety assist technology. Crucially, it earned just a three-star safety rating.

For a five-star car, you need to order the Stonic 3 or 4, or add forward collision-avoidance assist and lane keeping assist to the Stonic 2. The safety kit isn’t available on the Stonic Maxx.

Standard safety equipment includes twin front airbags, twin side airbags, twin curtain airbags, two ISOFIX points, electronic stability control, hill-start assist control, tyre pressure monitoring and emergency stop signalling. Blind-spot detection with rear cross-traffic alert is only available on the Stonic 4.

All versions come with rear parking sensors and an external temperature display, but the entry-level Stonic misses out on a reversing camera.

Kia's transferable seven-year, 100,000-mile warranty has helped the brand build a good reputation for customer satisfaction, which is reflected in the fact that it came 8th overall in the manufacturer rankings of HonestJohn.co.uk's latest Satisfaction Index. And it seems that the company's confidence in the reliability of its products are well founded, because the brand ranked seventh overall in the reliability standings of the same study, although the Stonic wasn't namechecked specifically.

There aren't a great deal of issues to look out for with the Stonic, though. We've heard of the petrol particulate filter warning light illuminating, but that's rare. Small, turbocharged engines like the Stonic's 1.0 T-GDi don't have the best form for long-term reliability but, so far, owners seem fairly content.

The Kia Stonic is a cheap car to insure, with insurance groups ranging from 8 to 14. Thanks to the additional driver assistance systems, the Stonic 3 and 4 are among the cheaper versions to insure.

Insurance groupings on the Seat Arona are slightly higher than those of the Stonic, with the small Spanish SUV slotting into groups 11 to 18.

Because the Stonic was released (just) after the tax rules changed in April 2017, you pay the same flat rate of £180 per year on all versions. No version costs more than £40,000 even when every available optional extra is fitted, so buyers won't be liable for the additional £390 'luxury car' surcharge.

Despite the largely numerically based trim structure, there’s no Kia Stonic 1, so the range kicks off with the Stonic 2, which features 17-inch alloy wheels, a seven-inch touchscreen display, Apple CarPlay, Android Auto, air conditioning, all-round electric windows, rear parking sensors, LED daytime running lights and cruise control.

The Kia Stonic Maxx special edition adds 17-inch grey alloy wheels, two-tone paint, roof-coloured door mirrors, privacy glass, a reversing camera and LED rear lights to the mix.

The mid-range Kia Stonic 3 gets satellite navigation, forward collision-avoidance assist, lane-keeping assist, driver attention warning, high-beam assist, cloth and leather upholstery, rain-sensing wipers and a leather-trimmed D-shaped steering wheel.

Finally, the Kia Stonic 4 features heated seats and steering wheel, keyless entry and start, blind-spot detection with rear cross-traffic alert, two-tone paint and faux leather upholstery. A lavish First Edition was available at launch, with the Maxx joining the range soon after.