Head-to-head
2025 Hyundai Ioniq 6 vs 2025 Kia K4
The Kia K4 edges it, 84.2 to 81.7, on price, tech & comfort, space & cargo. The Hyundai Ioniq 6 is ahead on fuel & range and performance. Raise the fuel & range weight from 3 to 3.7 and it flips.
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2025 Hyundai Ioniq 6
The 2025 Hyundai Ioniq 6 is sold in the U.S. as an electric midsize sedan with 5 EPA-rated configurations. Its longest-range version, the Ioniq 6 RWD (18 inch W…
vs
B2025 Kia K4
The 2025 Kia K4 is sold in the U.S. as a gas midsize sedan with 3 EPA-rated configurations. The most efficient version, the K4, is EPA-rated at 34 mpg combined.…
Verdict · default weights
2025 Kia K4
Slight edgeThe Kia K4 edges it, 84.2 to 81.7, on price, tech & comfort, space & cargo. The Hyundai Ioniq 6 is ahead on fuel & range and performance. Raise the fuel & range weight from 3 to 3.7 and it flips.
Fuel & range 2025 Hyundai Ioniq 6 leads by 71.8
Price 2025 Kia K4 leads by 41.9
Tech & comfort 2025 Kia K4 leads by 23.7
| Category · weight | 2025 Hyundai Ioniq 6overall 81.7 | 2025 Kia K4overall 84.2 | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Pricew 4 | 58.1 | 100 | |||||||||||||||
Base MSRP of the trim (or the model's lowest trim). Lower is better. | |||||||||||||||||
| Fuel & rangew 3 | 100 | 28.2 | |||||||||||||||
EPA annual fuel cost and combined mpg / MPGe; EV range when both are electric. | |||||||||||||||||
| Safetyw 4 | 92.1 | 89.2 | |||||||||||||||
NHTSA 5-Star rating, WhichTrim Safety Signal (open recalls by severity), owner complaints, standard driver-assist features (from the press kit, or from what the manufacturer filed with NHTSA where there is none). Open park-outside / do-not-drive advisories cost 25 points. | |||||||||||||||||
| Space & cargow 2 | 76.7 | 100 | |||||||||||||||
Seats, cargo volume behind the 1st and 2nd rows, rear legroom. | |||||||||||||||||
| Performancew 2 | 93.9 | 87.2 | |||||||||||||||
Horsepower, torque and horsepower per ton. | |||||||||||||||||
| Tech & comfortw 3 | 76.3 | 100 | |||||||||||||||
Standard (1) and optional (0.5) infotainment, convenience, climate and interior features from the manufacturer's press kit. | |||||||||||||||||
| Warrantynot compared | No data | No data | |||||||||||||||
| Overall | 81.7 | 84.2 | |||||||||||||||
Trim vs trim · 6 of 7 categories compared
Hyundai Ioniq 6: base trim SE Standard Range RWD · Kia K4: base trim LX FWD. Pick a trim in the tool to compare any other trim.
Raise the fuel & range weight from 3 to 3.7 and the answer flips.
Change what matters to you →Scores are 0–100 per category from the data on this page. The weights are yours to set.
Where the gap is
the biggest differences, from the scorecard's own numbersWhere the 2025 Kia K4 wins
- It starts $15,860 lower ($21,990 against $37,850 base MSRP).
- It lists more comfort and tech equipment (40 points against 30.5 on the press-kit count, standard = 1, optional = ½).
- It carries 100 hp per ton against 75.7.
Where the 2025 Hyundai Ioniq 6 answers
- It is rated 135 combined against 34 (EPA mpg or MPGe).
- It costs $1,300 a year less to fuel on the EPA's estimate ($550 against $1,850).
What they share
- 5 NHTSA stars.
Ranked by how far apart the two score on each measure, so a price gap and a horsepower gap are compared on the same scale. Every figure is on this page.
Specifications side by side
51 specs · manufacturer press kits| Spec | Hyundai Ioniq 6SE Standard Range RWD | Kia K4LX FWD |
|---|---|---|
| Pricing | ||
| Base MSRP (excludes destination) | $37,850 | $21,990 |
| Engine Basics | ||
| Aspiration | — | naturally aspirated |
| Cylinder count | — | 4 |
| Engine displacement | — | 1,999 cc |
| Engine type (full description) | Permanent-Magnet Synchronous Motor (PMSM) | 2.0L I-4, Multi Point Injection (MPI), Atkinson |
| Fuel injection system | — | gdi mpi |
| Valve configuration | — | DOHC 16-Valve |
| Engine Output | ||
| Horsepower | 149 hp | 147 hp |
| Torque | 258 lb-ft | 132 lb-ft |
| Fuel Economy | ||
| MPG (city) | — | 30 mpg |
| MPG (combined) | — | 34 mpg |
| MPG (highway) | — | 40 mpg |
| Transmission | ||
| Final drive ratio | 4.471 | 5.149:1 |
| Transmission speeds | 1 | — |
| Transmission type | Single-speed Reduction Gear | Intelligent Variable Transmission (IVT) |
| Dimensions Exterior | ||
| Ground clearance | 5.6 in | — |
| Overall height | 58.9 in | 55.9 in |
| Overall length | 191 in | 185 in |
| Overall width | 74 in | 72.8 in |
| Wheelbase | 116 in | 107 in |
| Cargo | ||
| Cargo volume behind 2nd row | 11.2 cu-ft | 14.6 cu-ft |
| Total interior volume | 114 cu-ft | 98.7 cu-ft |
| Seating | ||
| Passenger seating capacity | 5 | — |
| Headroom | ||
| Front headroom | 40.2 in | 39 in |
| Second-row headroom | 36.9 in | — |
| Third-row headroom | — | 37.3 in |
| Legroom | ||
| Front legroom | 42.3 in | 42.3 in |
| Second-row legroom | 39.2 in | — |
| Third-row legroom | — | 38 in |
| Weights | ||
| Curb weight (maximum) | 3,935 lbs | 2,956 lbs |
| Curb weight (minimum) | 3,935 lbs | 2,932 lbs |
| Gross vehicle weight rating | 4,894 lbs | 3,924 lbs |
| Suspension | ||
| Front suspension type | MacPherson strut | MacPherson strut |
| Rear suspension type | Multi-link | Coupled Torsion Beam Axle (CTBA) |
| Steering | ||
| Steering type | Rack and pinion, Motor Driven Power Steering (R-MDPS) | Column Mounted-Motor Driven Power Steering (C-MDPS) |
| Turning radius (curb-to-curb) | 19.4 ft | 17.6 ft |
| Brakes | ||
| Front brake diameter | 325 mm | 381 mm |
| Front brake type | ventilated disc | ventilated disc |
| Parking brake type | Electric | epb |
| Rear brake diameter | 325 mm | 356 mm |
| Rear brake type | solid disc | solid disc |
| Wheels | ||
| Wheel diameter | 18 in | 16 in |
| Wheel material | forged alloy | steel |
| Wheel width | 7.5 in | 6.5 in |
| Tires | ||
| Tire size | 225/55R18 | 205/55R16 |
| Fuel System | ||
| Fuel tank capacity | — | 12.4 gal |
| Minimum recommended octane | — | 92 |
| Connected Services | ||
| Connected services brand | Bluelink | — |
| Shoulder Room | ||
| Front shoulder room | 58 in | 56.5 in |
| Second-row shoulder room | 57.3 in | — |
| Third-row shoulder room | — | 54.7 in |
Green marks the better value where the direction is unambiguous (more room, more power, lower price). Blank rows are specs the press kit does not publish.
Equipment, feature by feature
161 features · differences first, then sharedSafety31 differ · 46 listed
| Feature | Hyundai Ioniq 6SE Standard Range RWD | Kia K4LX FWD |
|---|---|---|
| Blind-Spot Collision Warning | std | — |
| Forward Collision Avoidance (FCA), Car/Pedestrian/Cyclist/Junction-Turning | — | std |
| Rear Cross-Traffic Collision-Avoidance (RCCA) | std | — |
| Highway Driving Assist (HDA) | std | — |
| Lane Keeping Assist / Lane Following Assist | std | — |
| Dual rear seat-mounted side airbags | — | std |
| Parking Distance Warning (PDW) Front/Rear/Side | std | — |
| Parking Distance Warning (PDW) Front/Rear/Side | std | — |
| Safe Exit Warning (SEW) | std | — |
| Adjustable front-seat shoulder belt anchors | std | — |
| Brake Booster - Active Hydraulic Booster (Regenerative Brake) | std | — |
| Child Anchor (ISO FIX) | — | std |
| Cruise controls, smart (steering wheel) | std | — |
| Electric Parking Brake w/ Automatic Vehicle Hold | std | — |
| Front and rear 3-point seat belts | — | std |
| Front and rear seat-belt pretensioners and load limiter | — | std |
| Front and Rear seatbelt pretensioners and load limiters | std | — |
| Front seatbelt buckle sensor | — | std |
| Front seatbelt Driver's reminder | — | std |
| Front Ventilated Disc Brakes 12.8" x 1.2" (Φ325x30t) | std | — |
| Haptic Steering Wheel warning | — | std |
| Height-adjustable front seat-belt anchors | — | std |
| Intelligent Speed Limit Assist | std | — |
| Lane Following Assist (LFA) | — | std |
| Power window lock-out button | std | — |
| Rear Child Safety Door Locks | — | std |
| Rear child safety locks | std | — |
| Rear LATCH Lower Anchors and Upper Tether Anchors | std | — |
| Rear Solid Disc Brakes 12.8" x 0.5" (Φ325x12t) | std | — |
| Side air curtains with rollover sensors | std | — |
| Traction Control System (TCS) | std | — |
| Forward Collision Avoidance (FCA), Car/Pedestrian/Cyclist/Junction-Turning | std | std |
| Smart Cruise Control (SCC) with Stop and Go, steering remote control | std | std |
| Dual front advanced airbags | std | std |
| Dual front seat-mounted side airbags | std | std |
| Full-length side curtain airbags | std | std |
| Rear View Monitor (RVM) with Parking guidelines | std | std |
| Driver Attention Warning (DAW) | std | std |
| Anti-lock Brake System (ABS) | std | std |
| Electronic Stability Control (ESC) | std | std |
| High Beam Assist (HBA) | std | std |
| Hill-start Assist Control (HAC) | std | std |
| Rear Occupant Alert (ROA) | std | std |
| Vehicle Stability Management (VSM) | std | std |
| Immobilizer | std | std |
| Tire Pressure Monitor System (TPMS) High line | std | std |
Infotainment9 differ · 11 listed
| Feature | Hyundai Ioniq 6SE Standard Range RWD | Kia K4LX FWD |
|---|---|---|
| 12.3-inch Touch screen, ccNC Lite Radio, SXM and HD Radio | — | std |
| 4 speakers | — | std |
| Bluelink® Connected Car Services + OTA update capable | std | — |
| Bluelink® Connected Car System | std | — |
| Bluetooth Multiple Device Connection (up to two devices) | std | — |
| CarPlay/Android Auto Wired and Wireless | — | std |
| Steering wheel mounted paddle shifters | std | — |
| USB-C charger Front (2 ports, front center console) | — | std |
| USB-C charger Rear (2 ports, rear center console) | — | std |
| Audio and Bluetooth Hands-free with Steering remote control | std | std |
| Audio and Bluetooth Hands-free with Steering remote control | std | std |
Convenience7 differ · 9 listed
| Feature | Hyundai Ioniq 6SE Standard Range RWD | Kia K4LX FWD |
|---|---|---|
| Auto door lock system with Speed Sensing/Shift Lever Auto Lock, and Impact Sensing Unlock | — | std |
| Front and rear power windows | — | std |
| Inside Handle Override All Doors | — | std |
| Power outlet (x1) | — | std |
| Remote Trunk Lid Release Cable operated | — | std |
| Two-turn driver door unlock | — | std |
| Central door lock switch | — | std |
| Smart Key with Remote/Push-button Start Smart Trunk | std | std |
| Power driver window with auto-up/down | std | std |
Climate6 differ · 6 listed
| Feature | Hyundai Ioniq 6SE Standard Range RWD | Kia K4LX FWD |
|---|---|---|
| 2nd Row Air Vents | std | — |
| Air Conditioner Manual | — | std |
| Cabin air filter | std | — |
| Dual automatic temperature control | std | — |
| External temperature display | std | — |
| PTC Heater | — | std |
Seating9 differ · 10 listed
| Feature | Hyundai Ioniq 6SE Standard Range RWD | Kia K4LX FWD |
|---|---|---|
| 8-way power driver's seat | std | — |
| 6-way adjustable passenger seat | std | — |
| 8-way power driver's seat (with power lumbar) | std | — |
| Adjustable head restraints (all positions) | std | — |
| Bench fixed seatback folding | — | std |
| Driver's seat Height Adjustable - Pumping type | — | std |
| Passenger side Height Adjustable - Pumping type | — | std |
| Power lumbar support | std | — |
| Rear center armrest with cup-holder | std | — |
| Cloth seat trim | std | std |
Interior24 differ · 27 listed
| Feature | Hyundai Ioniq 6SE Standard Range RWD | Kia K4LX FWD |
|---|---|---|
| 4-inch TFT Cluster | — | std |
| 12.3-inch TFT Cluster | std | — |
| C/Pad interior trim with Technical Embossing | — | std |
| Cargo Light | std | — |
| Deluxe SynTex Inside Door Armrest | — | std |
| Floor console Armrest with SynTex material | — | std |
| Front/Rear Door Center Plastic Trim | — | std |
| Front/Rear Door Upper Plastic Trim | — | std |
| Glove Box with Damper | — | std |
| LED Interior Lights | std | — |
| LED Map and Room Lamp | — | std |
| Luggage Lamp | — | std |
| Metal Paint Inside Door Handle | — | std |
| Parking Brake Electronic Parking Brake (EPB) with Auto Hold | — | std |
| Soft PVC Transmission Gear Shift Knob | — | std |
| Steering Wheel - Brake regen paddle shifters | std | — |
| Steering Wheel - Tilt + Telescoping | std | — |
| Sunvisor Vanity mirror with cover and Driver's Ticket Holder | — | std |
| Two-spoke design, Polyurethane Steering Wheel | — | std |
| Sunvisor Sliding type with LED Illumination | std | — |
| Floor mats - Carpeted | opt | — |
| Seatback pockets (mesh type) | std | — |
| Sunvisors w/ sliding function | std | — |
| Front/Rear Inside Door Map Pocket and Bottle Holder | — | std |
| Inside Rear-view Mirror Day and Night | std | std |
| Manual tilt and telescopic steering column | std | std |
| Trip Computer | std | std |
Exterior33 differ · 36 listed
| Feature | Hyundai Ioniq 6SE Standard Range RWD | Kia K4LX FWD |
|---|---|---|
| LED Projector-Type Headlights (Low: Thin projector, High: Small cube projector) with integrated LED Fog Lights | std | — |
| 16-inch steel wheels (Dark Gray cover) | — | std |
| 18 x 7.5J Alloy Wheels (offset 51mm) | std | — |
| 225/55R18 tires | std | — |
| Acoustic Windshield | std | — |
| Active Air Flaps (lower front grille) | std | — |
| Black Belt-line molding | — | std |
| Black bumper | — | std |
| Black Radiator Grille with Metal Paint trim | — | std |
| Black Side Sill | — | std |
| Black Side Window Trim | — | std |
| Bulb type High Mounted Stop Lamp | — | std |
| Conventional Wiper Blade type | — | std |
| Door Handles (Flush-type) - Bodycolor | std | — |
| Escort headlights | — | std |
| Full LED Rear Combination Lamps | std | — |
| Heated Back-lite | — | std |
| K4 emblem (left side of trunk) | — | std |
| Laminated Glass - Front and rear | std | — |
| LED and Bulb type Rear Combination Lamps | — | std |
| LED Multi-Focus Reflector (MFR) Headlights | — | std |
| LED Turn Signal Indicators (outside mirrors) | std | — |
| Outside Mirror with Black Mirror Arm and Body Color Mirror Cap | — | std |
| Outside Mirrors - Bodycolor | std | — |
| Spare Tire - Tire Mobility Kit (TMK) | std | — |
| Trunk Lid Trim Inner cover with inside handle | — | std |
| UV Cut Glass and Solar Glass Windshield with Backlite, Front and Rear door | — | std |
| Rear window defroster with timer | std | — |
| Solar front glass - Front Door, Windshield | std | — |
| LED type High Mounted Stop Lamp | std | — |
| Single Muffler Hidden type | — | std |
| Temporary spare tire | — | std |
| Low Washer Fluid Warning | — | std |
| LED Amber Daytime Running Lights (DRL) | std | std |
| Outside Rear-view Mirror Electric adjustable and Heated | std | std |
| Auto Light Control System | std | std |
Powertrain8 differ · 8 listed
| Feature | Hyundai Ioniq 6SE Standard Range RWD | Kia K4LX FWD |
|---|---|---|
| Front-Wheel Drive (FWD) | — | std |
| 2.0L Multi Port Injection (MPI) engine | — | std |
| Battery preconditioning function | std | — |
| Drive Mode Select (Normal, Sport) | std | — |
| Intelligent Variable Transmission (IVT) | — | std |
| Permanent-Magnet Synchronous Motor (PMSM) | std | — |
| Shift-by-wire | std | — |
| Ultra-Fast Charger (up to 800V / 350 kW) On-Board Charger | std | — |
Chassis8 differ · 8 listed
| Feature | Hyundai Ioniq 6SE Standard Range RWD | Kia K4LX FWD |
|---|---|---|
| Column Mounted-Motor Driven Power Steering (C-MDPS) | — | std |
| Front McPherson strut with Coil spring | — | std |
| Front Suspension - MacPherson strut with Gas Damper | std | — |
| Motor Driven Power Steering (R-MDPS) - Power assisted, rack-mounted | std | — |
| Rack and pinion type steering gear | std | — |
| Rear Coupled Torsion Beam Axle (CTBA) | — | std |
| Rear Suspension - Multi-link with Gas Damper | std | — |
| Shock Absorber Type Gas | — | std |
Highlighted rows are where the two differ. Wording is the manufacturer's own.
Safety record
NHTSA recalls, complaints, NCAPHyundai Ioniq 6
Safety Signal 79 C
NHTSA overall ★★★★★
Frontal / side / rollover ★★★★☆ / ★★★★★ / ★★★★★
Recalls 3
Owner complaints 37 · 2 crashes · 0 fires
Most complained about Electrical System (22), Unspecified (8), Power Train (5)
Top recalls
- high Seat Belts 26V218000 · 294,448 vehicles
- high Electrical System 25V606000 · 31,042 vehicles
- high Electrical System 24V868000 · 145,642 vehicles
Kia K4
Safety Signal 89 B
NHTSA overall ★★★★★
Frontal / side / rollover ★★★★☆ / ★★★★★ / ★★★★★
Recalls 2
Owner complaints 51 · 11 crashes · 1 fires
Most complained about Electrical System (17), Unspecified (13), Lane Departure (10)
Top recalls
- high Engine And Engine Cooling 25V548000 · 30 vehicles
- minor Electrical System 26V046000 · 42,677 vehicles
Ownership
EPA, manufacturer warranty| Hyundai Ioniq 6SE Standard Range RWD | Kia K4LX FWD | |
|---|---|---|
| Price | $37,850 (base trim) | $21,990 (base trim) |
| Price range across trims | $37,850 – $54,600 7 trims | $21,990 – $28,090 5 trims |
| Powertrains | BEV | GAS |
| EPA configuration compared | Ioniq 6 Standard Range | K4 |
| Combined mpg / MPGe | 135 | 34 |
| EPA annual fuel cost | $550 | $1,850 |
| EV range | 240 mi | — |
| Basic warranty | — | — |
| Powertrain warranty | — | — |
| Roadside assistance | — | — |
Common questions
Source: EPA, NHTSA and manufacturer press kitsWhich is better, the 2025 Hyundai Ioniq 6 or the 2025 Kia K4?
The Kia K4 edges it, 84.2 to 81.7, on price, tech & comfort, space & cargo. The Hyundai Ioniq 6 is ahead on fuel & range and performance. Raise the fuel & range weight from 3 to 3.7 and it flips. On WhichTrim's default weights the 2025 Kia K4 scores 84.2 and the 2025 Hyundai Ioniq 6 81.7. The weights are yours to change — move what you care about and the verdict recalculates on the page.
Which is cheaper, the 2025 Hyundai Ioniq 6 or the 2025 Kia K4?
The 2025 Kia K4 starts lower — $21,990 against $37,850, a gap of $15,860 at the trims compared here. Both are manufacturer MSRPs before destination, options and dealer charges.
Which has the better safety record, the 2025 Hyundai Ioniq 6 or the 2025 Kia K4?
2025 Hyundai Ioniq 6: 5 NHTSA stars, grade C, 3 recalls. 2025 Kia K4: 5 NHTSA stars, grade B, 2 recalls. Crash ratings come from NHTSA's own tests; the grade is WhichTrim's read of the recall record, and the two can disagree.
What are the biggest differences between the 2025 Hyundai Ioniq 6 and the 2025 Kia K4?
Where the 2025 Kia K4 wins: it starts $15,860 lower ($21,990 against $37,850 base MSRP), lists more comfort and tech equipment (40 points against 30.5 on the press-kit count, standard = 1, optional = ½), and carries 100 hp per ton against 75.7. Where the 2025 Hyundai Ioniq 6 answers: it is rated 135 combined against 34 (EPA mpg or MPGe) and costs $1,300 a year less to fuel on the EPA's estimate ($550 against $1,850). What they share: 5 NHTSA stars.