Compare the2026 Kia K4VS 2026 Audi A3

In the past twenty years hundreds of infants and young children have died after being left in vehicles, usually by accident. When turning the vehicle off, drivers of the K4 are reminded to check the back seat if they opened the rear door before starting out. The A3 doesn’t offer a back seat reminder.

With its standard Forward Collision-Avoidance Assist, the Kia K4 is better at preventing collisions with pedestrians than the Audi A3, according to the Insurance Institute for Highway Safety:

In a Vehicle-to-Vehicle Frontal Crash Prevention 2.0 test conducted by the Insurance Institute for Highway Safety (IIHS), the Kia K4 achieved a “Acceptable” rating - the second highest possible - for its performance in forward collision warning and automatic braking systems, demonstrating its excellent capabilities in preventing collisions. The Audi A3 has not been tested.

The K4’s driver alert monitor detects an inattentive driver then sounds a warning and suggests a break. According to the NHTSA, drivers who fall asleep cause about 100,000 crashes and 1500 deaths a year. The A3 doesn’t offer a driver alert monitor.

Both the K4 and the A3 have standard driver and passenger frontal airbags, front and rear side-impact airbags, side-impact head airbags, front seatbelt pretensioners, height adjustable front shoulder belts, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, daytime running lights, lane departure warning systems, rearview cameras, available blind spot warning systems, around view monitors and rear cross-path warning.

The Kia K4 Sedan (Built after January 2025) has achieved the Insurance Institute for Highway Safety’s (IIHS) highest rating of “Top Safety Pick Plus” for the 2025 model year. This distinction is based on its exceptional performance in IIHS’ rigorous battery of safety tests. Specifically, it earned a “Good” rating in the latest, more stringent moderate overlap front crash test, a “Good” result in the updated side impact test, and a “Good” score in the revised pedestrian crash prevention test. The A3 is not even a standard “Top Safety Pick” for 2025.

The K4 comes with a full 5-year/60,000-mile basic warranty, which covers the entire car and includes 24-hour roadside assistance. The A3’s 4-year/50,000-mile basic warranty expires 1 year or 10,000 miles sooner.

Kia’s powertrain warranty covers the K4 6 years and 50,000 miles longer than Audi covers the A3. Any repair needed on the engine, transmission, axles, joints or driveshafts is fully covered for 10 years or 100,000 miles. Coverage on the A3 ends after only 4 years or 50,000 miles.

There are almost 3 times as many Kia dealers as there are Audi dealers, which makes it much easier should you ever need service under the K4’s warranty.

J.D. Power and Associates rated the K4 second among small cars in their 2025 Initial Quality Study. The A3 isn’t in the top three in its category.

J.D. Power and Associates’ 2025 Initial Quality Study of new car owners surveyed provide the statistics that show that Kia vehicles are better in initial quality than Audi vehicles. J.D. Power ranks Kia above average in initial quality. With 88 more problems per 100 vehicles, Audi is rated below average.

J.D. Power and Associates’ 2025 survey of the owners of three-year-old vehicles provides the long-term dependability statistics that show that Kia vehicles are more reliable than Audi vehicles. J.D. Power ranks Kia above average in long-term dependability. With 6 more problems per 100 vehicles in the first three years of ownership, Audi is rated below average.

On the EPA test cycle the K4 Sedan gets better mileage than the A3:

On the EPA test cycle the K4 Hatchback gets better mileage than the A3:

To lower fuel costs and make buying fuel easier, the Kia K4 uses regular unleaded gasoline. The A3 requires premium for maximum efficiency, which can cost on average about 84.9 cents more per gallon.

An eight-speed automatic is standard on the Kia K4 GT-Line Turbo, for better acceleration and lower engine speed on the highway. Only a seven-speed automatic is available for the A3.

The K4 has a standard continuously variable transmission (CVT). With no “steps” between gears, it can keep the engine at the most efficient speed for fuel economy, or keep it at its peak horsepower indefinitely for maximum acceleration. The A3 doesn’t offer a CVT.

The K4 stops shorter than the A3:

For better traction, the K4 GT-Line’s tires are larger than the largest tires available on the A3 (235/40R18 vs. 225/45R17).

For a smoother ride and more stable handling, the K4’s wheelbase is 3.6 inches longer than on the A3 (107.1 inches vs. 103.5 inches).

For better handling and stability, the average track (width between the wheels) on the K4 is 1.4 inches wider in the front and 2.9 inches wider in the rear than the track on the A3.

For better maneuverability, the K4’s turning circle is 1.3 feet tighter than the A3’s (35.2 feet vs. 36.5 feet).

The Kia K4 may be more efficient, handle and accelerate better because it weighs about 200 to 400 pounds less than the Audi A3.

Because it has more passenger and cargo room, the EPA rates the K4 a Mid-size car, while the A3 is rated a Subcompact.

The K4 has 11.7 cubic feet more passenger volume than the A3 (98.7 vs. 87).

The K4 Sedan has 2.2 inches more front headroom, 1.1 inches more front legroom, 1.7 inches more front shoulder room, .7 inches more rear headroom, 2.8 inches more rear legroom and 1.7 inches more rear shoulder room than the A3.

The K4 Sedan has a much larger trunk than the A3 (14.6 vs. 10.9 cubic feet).

The K4 has a standard remote vehicle starting system, so the vehicle can be started from inside the driver's house. This allows the driver to comfortably warm up the engine before going out to the vehicle. The climate system will also automatically heat or cool the interior. The A3 doesn’t offer a remote starting system.

The K4 GT-Line’s optional easy entry system glides the driver’s seat back when the door is unlocked or the ignition is switched off, making it easier for the driver to get in and out. The A3 doesn’t offer an easy entry system.

The K4’s standard Smart Key allows you to unlock the doors from either front door handle, open the trunk, and start the engine, all without removing the key from the pocket or purse. Keyless Engine Start/Stop standard on the A3 only offers hands-free access for the ignition, none to unlock the car.

The K4’s sun-visors swivel front-to-side to block glare from the side windows. The A3’s visors are fixed into the windshield header.

Optional air-conditioned seats in the K4 GT-Line keep the driver and front passenger comfortable and take the sting out of hot seats in Summer. The A3 doesn’t offer air-conditioned seats.

On extremely cold winter days, the K4 GT-Line’s optional heated steering wheel provides comfort, allowing the driver to steer safely and comfortably before the car heater warms up. The A3 doesn’t offer a heated steering wheel.

Compared to traditional radio, the Kia K4’s standard SiriusXM satellite radio provides an unmatched listening experience. Its extensive coverage guarantees consistent, crystal-clear reception across the continental U.S., and access to over 100 channels dedicated to a multitude of genres, including music, news, sports, talk shows, and comedy, many with only limited commercial breaks. Satellite radio costs extra on the A3.

The Kia K4 comes in sedan and four door hatchback bodystyles; the Audi A3 isn’t available as a four door hatchback.

J.D. Power and Associates rated the K4 first among small cars in owner reported satisfaction. This includes how well the vehicle performs and satisfies its owner’s expectations. The A3 isn’t in the top three in its category.

The Kia K4 outsold the Audi A3/S3/RS 3 by almost 17 to one during 2025.