2026 Newmar Mountain Aire 4118 $942,350

2026 Newmar Mountain Aire 4118

New Class A RV

at Transwest of Belton, MO

$942,350 msrp

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New Class A RV

at Transwest of Belton, MO

$942,350 msrp

Sleeps 3
Diesel
3 Slide Outs
665 Miles

The 2026 Mountain Aire packs big-time power, earns all the style points, and delivers on its high-end comfort in a coach that’s just under 39 feet long. It’s the shortest tag-axle in Newmar’s lineup, built on the SpartanⓇ K3 chassis with a 525-horsepower CumminsⓇ engine and 15,000-pound towing capacity. Headed cross-country or out for the weekend? No worries, this RV gives you the control, performance, and space to make every mile feel like home.

Inside and out, the Mountain Aire knows how to make an entrance. From premium finishes to smart tech, it provides everything travelers look for in a high-end motorhome. You can find the 2026 Mountain Aire now at Transwest RV in Colorado, where you can see it for yourself.

Apply for financing

Same day approvals available

Got one to sell?

We’ll buy your RV for cash or trade it in!

Specifications

Type: Class A
Year: 2026
Make: Newmar
Model: Mountain Aire
Submodel: 4118
Chassis Brand: Spartan
Stock ID: 17N253321
VIN (Last 6): 096164
List Price: $942,350
Status: Available
Condition: New
Living Quarters: No
Mileage: 665

Exterior

Number of Slide Outs: 3

Interior

Sleeping Capacity: 3

Systems

Generator Make: Onan
Black Water Capacity (gal): 60
Fresh Water Capacity (gal): 105
Gray Water Capacity (gal): 80

Dimensions & Weights

GVWR (lbs): 54,000

Engine & Chassis

Engine Make: Cummins
Fuel Capacity (gal): 150
Fuel Type: Diesel
Horse Power: 525

Disclaimer: Not every vehicle includes every feature or option listed. Please verify all features and options with your salesperson before purchase.

Floor plan

Disclaimer: This floor plan is for general reference. Actual features and styling could differ.

Download Floor plan

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Our Customers Say It Best

2026 Newmar Mountain Aire Features

Download the Brochure

Designed to impress

The Mountain Aire brings bold curb appeal with Newmar’s signature full-paint finish and the optional Onyx Package, which adds dark accents throughout. Dual power slide trays, a slide-out Dometic freezer with optional fridge upgrade, and lighted exterior storage make it both aesthetically pleasing and functional.
Pilot your ride

This coach is equipped with Newmar’s Comfort DriveⓇ steering system, providing a smooth and more controlled ride. The anti-glare digital dash displays vehicle information clearly, while a 360° stitched camera system improves visibility in tight turns and narrow spaces. Co-pilot controls feature a touchscreen display for clear navigation and camera views, making this setup ideal.
Room to relax

There’s tons of space to stretch out inside the Mountain Aire. The power theater seats feature hidden storage and illuminated cupholders, providing a cozy spot to kick back and relax. The Euro-style dinette features a hidden leaf extension and includes two folding chairs to seat extra guests comfortably.
A convenient kitchen

The Mountain Aire’s kitchen comes ready for meal prep, both inside and out. A portable dual-burner induction cooktop plugs in easily outdoors or on the counter, and a WhirlpoolⓇ convection microwave with built-in air fryer makes cooking easy. The single-basin sink is paired with solid-surface covers and cutting boards, and the dishwasher is tucked away.
Your bedroom retreat

In the back of the coach, the bedroom is spacious, bright, and is calling your name. A king-size bed with large nightstands features a built-in power station, while wardrobes with six full drawers provide ample storage. A SamsungⓇ Smart TV is positioned for easy viewing, and controls for lighting and shade are conveniently within arm’s reach.
Elevated bathrooms

This coach includes a spacious rear full bath and a convenient mid-ship half bath. In back, you’ll find a tiled shower with a rain-style head, built-in bench, extra headroom, and a water-saving system for off-grid travel. A stacked washer and dryer are also tucked into the rear. The half bath adds flexibility for guests.

Review

2026 Newmar Mountain Aire 3825 Walkthrough Tour

Some coaches just feel right. The 2026 Newmar Mountain Aire 3825 blends bold looks, smart features, and an easy-to-navigate layout that takes the hassle out of travel from the very beginning. It&rsq...

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Finance Your RV

Found the RV of your dreams? Get on the road quickly with trusted financing from Transwest.

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Submit your information through our easy online application process. We can help you find the best down payment and rate for your RV.

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You'll be on the road in no time, while we handle the title work and any hassle. Financing your RV has never been easier!

This RV can be found at our Transwest location near Kansas City, MO

17327 S Outer Rd
Belton, MO 64012

(816) 892-5950

Location Details

Frequently Asked Questions

Can I finance an RV?

Yes, RVs can be a big purchase, so there is a range of financing options available to keep you within budget. At Transwest, we have an in-house financing team that specializes in financing recreational vehicles. They know the industry as well as the needs of RVers, so they’re happy to help you find the right financing for your motorhome.

What should I do with my old RV?

We’ll buy it! At Transwest, we buy used RVs. In particular, we are always looking for late model Class A RVs, Class B RVs, Class C RVs, and Super C RVs, although we’re happy to discuss other types of RVs you’d like to sell. Submit an inquiry to get started.

Who handles the title work when financing an RV?

Our team at Transwest takes care of the title work when you finance an RV.

What if I want to add upgrades or accessories to my RV?

One of the great aspects of an RV is customizing it to your needs and wants. At Transwest, we have a full RV parts department that carries both mechanical parts and additional accessories for sale. You’ll be able to find the add-ons that help make your RV feel like home.

Do I need a certain credit score to finance an RV?

While credit history definitely factors into your financing options, don't get too hung up on having a certain score. Part of the reason we work with several different lenders is so that we have options that work with as many lifestyles and budgets as possible. Instead of wondering if you'll qualify, the best thing to do is start the process and our team will guide you through it.

Who builds the Mountain Aire?

The 2026 Mountain Aire is built by Newmar, a trusted name in luxury motorhomes for more than 50 years.

What kind of engine does the Mountain Aire have?

The Mountain Aire is powered by a 525-horsepower Cummins X12 diesel engine with 1,695 lb-ft of torque, paired with a Spartan K3 tag-axle chassis.

Is the Mountain Aire a good fit for full-time RV living?

Absolutely! With home-grade appliances, plenty of storage space for your belongings, and a power-packed diesel engine, the Mountain Aire supports your full-time adventures on the road.