Trunk comparison: Kia Stonic vs Seat Leon

Key Differences

The SEAT Leon offers a significantly longer cargo floor when loaded (front seats upright): +5.5 in (20%) longer than the Kia Stonic.

Additionally, the Leon's trunk is deeper (distance from loading edge to trunk floor) by +2.8 in (39%), and at its narrowest point, the Kia Stonic is wider: +9.4 in (30%) more width compared to the Leon.

Other, smaller differences: With the rear seats fully folded down, the Leon is only slightly longer (+4.7 in / 9%).

The width of the trunk opening is 10% (+3.9 in) greater on the Leon than on the Stonic, and the loading edge of the Stonic sits 0.8 in (3%) higher above the road than the Leon. The height of the trunk opening differs hardly at all (+0.4 in / 1% in favor of the Leon).

Impact on Usability

The longer cargo floor of the SEAT Leon with the rear seats upright makes it more practical for everyday use and transporting longer items (e.g., slats, skis, furniture parts): longer items can be transported without folding down the rear seats.

The significantly greater depth of the Leon means more usable volume vertically between the loading edge and floor — this helps when storing taller or stacked items and increases the overall usable volume.

The Kia Stonic, on the other hand, scores with usable width at the narrowest point: the 9.4 in greater narrowest width allows storing wider items that might not fit through the Leon's narrow spot.

This makes the Stonic advantageous for wide, flat goods or larger boxes, even though its cargo space is overall shorter and less deep.

Practically, this means: For frequent transport of longer or taller loads, the SEAT Leon is the better choice. For transports where width at the narrow point is decisive (wide but not necessarily very long or tall items), the Kia Stonic has the advantage.

Smaller differences like the Leon's 10% larger opening width or the Stonic's 0.8 in higher loading edge only marginally affect everyday usability.