How much does the 2021 BMW 3 Series cost?

Prices have softened 7.79% compared to this time last year, making it a favorable time to shop this model year.

There are 1,533 listings available, which suggests solid inventory for comparison shopping.

If you find a listing below $25,866.11, that's toward the low end of the year-round range and worth acting on quickly.

Is the 2021 BMW 3 Series a good car?

Yes — the 2021 BMW 3 Series earns a 5/5 user rating and a 6.83/10 expert rating.

The standout strength is Technology at 9/10.

Owners consistently praise the handling, powerful performance, luxurious interior, and safety features, while also calling out fuel economy and trunk space as positives. That lines up with the car’s use case as a luxury sedan that still keeps some of BMW’s traditional driving character, even as it leans more toward comfort and convenience. The main trade-offs are that the audio system and mechanical noises bothered some owners, and the expert review says the car is competent but not especially engaging.

With 33.3% of listings marked as good or great deals, you have a meaningful number of value-oriented options to compare.

Is the 2021 BMW 3 Series reliable?

Owners rate it 5/5, a strong signal of long-term satisfaction.

The owner feedback points to a car that feels dependable and trouble-free enough to inspire confidence, with many drivers expressing strong satisfaction over the long term. The expert review also emphasizes the sedan’s solid engineering and sturdy feel, which supports the impression of a car you can count on. BMW’s standard warranty covers four years or 50,000 miles, with four years of free roadside assistance.

For used buyers, the main long-term ownership risk is less about outright reliability and more about choosing a well-maintained example with the right equipment and service history.

What should I look for when buying a used 2021 BMW 3 Series?

At 74.2% accident-free, a meaningful share of listings has prior incidents — history verification is especially important.

You should start with a vehicle history report and then prioritize a pre-purchase inspection, especially if the car has higher mileage or optional driver-assist equipment. Pay close attention to signs of prior bodywork, uneven panel gaps, tire wear, brake condition, and any warning lights or electronic glitches. Because this model’s safety and convenience features vary by package, it also pays to confirm exactly which equipment is installed.

Key things to evaluate:

• Trim level: The standard Sport Line trim package comes with 18-inch wheels, while the optional M Sport package adds M 19-inch wheels and blue-painted brake calipers. The interior uses synthetic Sensatec as standard, and leather upholstery is optional.
• Powertrain: The base 330i uses a 2.0-liter turbocharged four-cylinder with 255 horsepower and 295 pound-feet of torque. The 330e plug-in hybrid makes 288 hp and 310 lb-ft combined, while the M340i uses a turbo inline-six with 382 hp and 369 lb-ft. All versions use an eight-speed automatic.
• Safety package: Forward-collision warning, automatic emergency braking, and lane-departure warning are standard. Adaptive cruise control, lane-keep assist, automated lane centering, blind-spot monitoring, rear cross-traffic alert, a 360-degree camera system, and automated parking aid are available through packages.
• Infotainment: The standard system includes an 8.8-inch touchscreen, Bluetooth, and two USB ports. Gasoline models get Apple CarPlay and Android Auto, while the 330e only gets CarPlay. Live Cockpit Professional adds a digital instrument cluster and navigation, and a head-up display is available.
• Fuel efficiency: The 330i is rated at 30 mpg combined, while the M340i is rated at 26 mpg combined. The 330e plug-in hybrid is rated for 23 miles of electric range with RWD or 20 miles with AWD, and 75 MPGe or 67 MPGe in electric mode. In hybrid mode, the 330e is rated at 28 mpg combined with RWD or 25 mpg combined with AWD.

Which 2021 BMW 3 Series trim should I buy?

The 2021 BMW 3 Series is offered in 3 trim levels: 330i, 330e, M340i.

Here's the short version:

• Base trim: The 330i gives you the core 3 Series experience, but you still need options if you want a fuller safety package or more upscale cabin materials.
• Sweet-spot trim: The 330e is the most interesting value play if you can plug in regularly, because it adds electric driving capability and strong efficiency potential.
• Premium/top trim: The M340i is the performance choice, with the turbo inline-six and the quickest acceleration in the lineup.

The lower-level Driving Assistant Package adds blind-spot monitoring and rear cross-traffic alert, while the Driving Assistant Professional Package adds adaptive cruise control, lane-keep assist, automated lane centering, stop-and-go functionality, Extended Traffic Jam Assistant, and Active Side Collision Avoidance.

Is now a good time to buy a used 2021 BMW 3 Series?

This is a moderate market for selective buyers, with enough inventory to shop carefully and enough price softness to reward patience.

• Deal availability: 33.3% of listings are priced as good or great deals.
• Inventory: There are 1,533 listings available.
• Price trend: Prices have softened 7.79% compared with last year.
• Clean inventory: 74.2% of listings are accident-free.

If you find a listing below $25,866.11, that's toward the low end of the year-round range and worth acting on quickly.

What is the 2021 BMW 3 Series's resale value?

The current average of $25,863 sits slightly below last year's $28,049.

That price movement suggests the market has already adjusted downward, which can help you buy at a more favorable entry point today. For a future seller, it also means resale value may depend heavily on condition, mileage, and equipment rather than just the badge alone. Well-kept examples with desirable options should hold up better than stripped or heavily used cars.

Vehicles with strong owner satisfaction ratings, like this model year's 5/5, tend to retain buyer demand, which supports resale value over time.

Is the 2021 BMW 3 Series safe?

The 2021 BMW 3 Series got a “Top Safety Pick” award from the Insurance Institute for Highway Safety (IIHS), with top “Good” scores in all crash tests.

It earns a 7/10 safety score from our experts.

BMW’s standard driver-assistance features include forward-collision warning, automatic emergency braking, and lane-departure warning. More advanced features such as adaptive cruise control, lane-keep assist, automated lane centering, blind-spot monitoring, rear cross-traffic alert, a 360-degree camera system, and automated parking aid require additional packages. The optional Active Driving Assistant Professional system also scored lower than the base system in vehicle-to-pedestrian front-crash prevention, so that’s worth checking carefully if safety tech matters to you.

Should I buy a 2021 BMW 3 Series or consider a different year?

If you're weighing the 2021 against nearby model years, here's how to think about it:

Choose the 2021 if:

• 33.3% of listings are priced as good or great deals.
• At 74.2% accident-free, a meaningful share of listings has prior incidents — history verification is especially important.
• Price trend: Prices have softened 7.79% compared with last year.
• Owners rate it 5/5 — a strong satisfaction signal.
• The 2021 adds the 330e plug-in hybrid to the lineup.

Consider the 2020 if:

• At $23,844, the 2020 costs less than the current year's $25,863 average.
• It emphasizes driver engagement and comfort.

Consider the 2022 if:

• At $28,790, the 2022 costs more than the current year's $25,863 average.
• It standardizes Live Cockpit Professional with navigation.

The bottom line: The 2021 is the right pick if you want a well-rounded 3 Series with strong owner satisfaction, good inventory, and a softer price than last year. If your priority is spending less, the 2020 is the better value play; if you want a slightly newer setup and don’t mind paying more, the 2022 is the cleaner upgrade path.

These recommendations are based on CarGurus' proprietary market data from August 21, 2026, CarGurus experts' opinions, and generative AI.