Kia K4 vs. K5: Which 2027 Kia Sedan Fits You?

What Are the Kia K4 and Kia K5?

The Kia K4 is a compact sedan, and the Kia K5 is a midsize sedan that sits one size up in Kia’s lineup. Both are four-door sedans with front-wheel drive as standard, a 12.3-inch touchscreen and Kia’s driver-assistance features.

This guide compares the 2027 Kia K4 sedan with the 2027 Kia K5, using Kia’s published specifications and EPA estimates. The K4 is also offered as the K4 Hatchback, but the figures here are for the sedan.

Kia K4 vs. K5: Side-by-Side Specs

The K5 is longer and more powerful, while the K4 is more fuel efficient and has more rear legroom.

Specs vary by trim and equipment. Confirm details on the window sticker of the specific vehicle.

Shopping a 2026 Model?

Our lot carries 2026 and 2027 models. The 2026 K4 shares the 2027 K4’s engines, length, rear legroom, trunk space and EPA ratings. The 2026 K5’s base 2.5L is rated at 191 horsepower and 181.5 lb-ft, and its lineup adds an EX trim; its size, legroom, trunk and GT output match the 2027 K5.

Is the Kia K4 Smaller Than the K5?

Yes. The 2027 K4 is 7.7 inches shorter than the 2027 K5, at 185.4 inches versus 193.1 inches. Its wheelbase is 5.1 inches shorter, and it is 0.4 inches narrower.

That smaller footprint makes the K4 easy to park in tight spaces around campus and busy shopping centers. The K5’s longer body gives the driver and front passenger more room to stretch out.

Which Kia Sedan Has More Rear Legroom?

The K4 does. Kia lists 38.0 inches of rear legroom for the 2027 K4, compared with 35.2 inches in the 2027 K5. Kia describes the K4’s rear-seat legroom as class-leading.

The K5 wins up front, with 46.1 inches of front legroom versus 42.3 inches in the K4. So if you often carry adults in the back seat, the K4 has a surprising edge. If the driver’s seat is where you spend most of your time, the K5 feels roomier.

Which Has the Bigger Trunk?

The K5 has the bigger trunk at 15.6 cubic feet, compared with 14.6 cubic feet in the K4 sedan. That one cubic foot is a modest difference for groceries, luggage and sports gear. The K4 sedan has 60/40 split-folding rear seats starting on the LXS trim, which help with longer items.

How Do the K4 and K5 Engines Compare?

The K5 is the more powerful sedan. Its standard 2.5L four-cylinder makes 186 horsepower, and the K5 GT’s 2.5L turbo makes 290 horsepower and 311 lb-ft of torque. Kia calls that torque figure class-leading.

The K4 uses a 2.0L four-cylinder with 147 horsepower on most trims. The K4 GT-Line Turbo steps up to a 1.6L turbo with 190 horsepower.

• K4 transmissions: An Intelligent Variable Transmission (IVT) with the 2.0L, and an 8-speed automatic with the 1.6L turbo.
• K5 transmissions: An 8-speed automatic with the 2.5L, and an 8-speed dual-clutch automatic in the K5 GT.

What Makes the K5 GT Different?

The K5 GT is the performance version of the K5. Kia equips it with the 290-hp turbo engine, a sport-tuned suspension, 19-inch wheels, larger front and rear brakes, paddle shifters and a panoramic sunroof.

Which Gets Better Gas Mileage, the K4 or K5?

The K4 gets better gas mileage. Most 2027 K4 trims are EPA-rated at 29 city, 39 highway and 33 combined MPG. The K4 GT-Line Turbo is rated at 26/33/28 MPG.

The 2027 K5 LXS is EPA-rated at 26 city, 37 highway and 30 combined MPG. The front-wheel-drive GT-Line is rated at 25/36/29, while the GT-Line AWD and the GT are each rated at 23/33/27.

These are EPA estimates. Actual mileage varies with driving habits, conditions and vehicle condition.

Does the Kia K5 Have All-Wheel Drive?

Yes. The 2027 K5 offers available all-wheel drive on the GT-Line trim. Kia describes the system as designed to actively distribute torque between the front and rear axles for added traction and control.

Kia’s 2027 K4 specifications list front-wheel-drive models only. If all-wheel drive matters to you in a sedan, the K5 GT-Line is the one to drive.

How Do the K4 and K5 Trims Line Up?

The K4 offers five trims and the K5 offers three. Here are a few highlights Kia lists for each:

• K4 LX: 12.3-inch touchscreen with wireless Apple CarPlay and Smart Cruise Control with Stop & Go.
• K4 LXS: Adds 16-inch alloy wheels, Blind-Spot Detection and Rear Cross-Traffic Collision-Avoidance Assist.
• K4 EX: Adds heated front seats, dual-zone automatic climate control and a wireless phone charger.
• K4 GT-Line and GT-Line Turbo: Sporty styling, 18-inch wheels and paddle shifters, with the 190-hp turbo on the GT-Line Turbo.
• K5 LXS: 16-inch alloy wheels and a smart key with push-button start and remote start.
• K5 GT-Line: GT-Line styling, 18-inch wheels, navigation, heated front seats and a power driver’s seat.
• K5 GT: The 290-hp performance model.

Which Kia Sedan Is Right for You?

Both sedans share Kia’s focus on technology and value. The right pick comes down to how you drive.

Choose the K4 if you:

• Want the best fuel economy in a Kia sedan, at up to 33 MPG combined.
• Carry rear passengers often and want the extra rear legroom.
• Need easy parking with a shorter footprint.
• Like hatchback flexibility, since the K4 is also offered as a hatchback.

Choose the K5 if you:

• Want more power, from 186 hp up to 290 hp in the K5 GT.
• Want available all-wheel drive on the GT-Line.
• Prefer more front-seat room and a slightly larger trunk.
• Drive long highway miles and like a larger midsize sedan.

What Do Both Kia Sedans Share?

Both 2027 sedans come standard with a 12.3-inch touchscreen with Apple CarPlay, according to Kia, and both are covered by Kia’s 10-year/100,000-mile Powertrain Limited Warranty for the original purchaser. Both also offer Digital Key 2.0 in packages on select upper trims, which lets a compatible smartphone work as your key.

Our 2026 Kia K5 research guide and our Kia K4 sedan and hatchback research guide cover each model in more detail.

Compare the K4 and K5 at Greenway Kia East

The best way to choose is to sit in the back seat of each, then drive them back to back. Browse our Kia K4 inventory and our Kia K5 inventory to see what is on the lot, or view our full new vehicle inventory.

Greenway Kia East serves drivers from Waterford Lakes, the UCF area, Avalon Park, Union Park and Winter Park. Value your trade, then contact Greenway Kia East or call (407) 557-9565 to set up a side-by-side test drive.

About the Author

This guide was prepared by the sales and service team at Greenway Kia East, a Kia dealership at 8701 E Colonial Drive, Orlando, FL 32817. We serve drivers across East Orlando, Waterford Lakes, the UCF area, Avalon Park, Union Park and Winter Park. Reach sales at (407) 557-9565 or service at (407) 583-1264.

References

Kia Media: 2027 Kia K4 Specifications — https://www.kiamedia.com/us/en/models/k4/2027/specifications (dimensions, legroom, trunk, engines, transmissions, EPA-estimated MPG, trims, FWD-only listing)

Kia Media: 2027 Kia K5 Specifications — https://www.kiamedia.com/us/en/models/k5/2027/specifications (dimensions, legroom, trunk, engines, brakes, GT-Line AWD, EPA-estimated MPG by trim, Digital Key 2.0 package)

Kia Media: 2026 Kia K5 Specifications — https://www.kiamedia.com/us/en/models/k5/2026/specifications (2026 K5 191 hp and 181.5 lb-ft, EX trim, unchanged dimensions, legroom, trunk and GT output)

Kia Media: 2026 Kia K4 Specifications — https://www.kiamedia.com/us/en/models/k4/2026/specifications (2026 K4 engines, dimensions and EPA ratings match 2027)

Kia.com: 2027 Kia K4 — https://www.kia.com/us/en/k4 (trims and EPA-estimated MPG, class-leading rear seat legroom, standard 12.3-in. touchscreen with Apple CarPlay, 60/40 split-folding rear seats on LXS)

Kia.com: 2027 Kia K5 — https://www.kia.com/us/en/k5 (trims and EPA-estimated MPG, 290-hp GT and class-leading torque, GT equipment, AWD description)

Kia.com: Warranty — https://www.kia.com/us/en/warranty (10-year/100,000-mile Powertrain Limited Warranty for the original purchaser)